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////////////////////////////////////////////////////////////////////////////////
//
// Filename:    ddrsdramsim.cpp
//
// Project:     A wishbone controlled DDR3 SDRAM memory controller.
//
// Purpose:     
//
// Creator:     Dan Gisselquist, Ph.D.
//              Gisselquist Technology, LLC
//
////////////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2015-2016, Gisselquist Technology, LLC
//
// This program is free software (firmware): you can redistribute it and/or
// modify it under the terms of  the GNU General Public License as published
// by the Free Software Foundation, either version 3 of the License, or (at
// your option) any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program.  (It's in the $(ROOT)/doc directory, run make with no
// target there if the PDF file isn't present.)  If not, see
// <http://www.gnu.org/licenses/> for a copy.
//
// License:     GPL, v3, as defined and found on www.gnu.org,
//              http://www.gnu.org/licenses/gpl.html
//
//
////////////////////////////////////////////////////////////////////////////////
//
//
#include <stdio.h>
#include <assert.h>
 
#define PREFIX  "DDR3-SDRAM"
const unsigned ckCL = 5,
                ckRC = 3,
                ckRFC = 320, // Clocks from refresh to activate
                nREF = 4,
                ckREFI = 1560, // 7.8us @ 200MHz = 7.8e-6 * 200e6 = 1560
                ckREFIn = nREF*ckREFI - (nREF-1) * ckRFC;
 
#include "ddrsdramsim.h"
void    BANKINFO::tick(int cmd, unsigned addr) {
        switch(cmd) {
                case DDR_PRECHARGE:
                        m_state = 6;
                        // While the specification allows precharging an already
                        // precharged bank, we can keep that from happening
                        // here:
                        // assert(m_state&7);
                        // Only problem is, this will currently break our
                        // refresh logic.
                        break;
                case DDR_ACTIVATE:
                        m_state = 1;
                        m_row = addr & 0x7fff;
                        break;
                case DDR_READ: case DDR_WRITE:
                        printf("BANK::R/W Request, m_state = %d\n", m_state);
                        assert((m_state&7) == 7);
                        break;
                case DDR_ZQS:
                        assert((m_state&7) == 0);
                        break;
                case DDR_NOOP:
                        m_state <<= 1;
                        m_state |= (m_state&2)>>1;
                        break;
                default:
                        break;
        }
}
 
int gbl_state, gbl_counts;
 
DDRSDRAMSIM::DDRSDRAMSIM(int lglen) {
        m_memlen = (1<<(lglen-2));
        m_mem = new unsigned[m_memlen];
        m_reset_state = 0;
        m_reset_counts= 0;
        m_bus = new BUSTIMESLOT[NTIMESLOTS];
        for(int i=0; i<NTIMESLOTS; i++)
                m_bus[i].m_used = 0;
        m_busloc = 0;
}
 
unsigned DDRSDRAMSIM::operator()(int reset_n, int cke,
                int csn, int rasn, int casn, int wen,
                int dqs, int dm, int odt, int busoe,
                int addr, int ba, int data) {
 
        int     cmd = (reset_n?0:32)|(cke?0:16)|(csn?8:0)
                        |(rasn?4:0)|(casn?2:0)|(wen?1:0);
        if ((m_reset_state!=0)&&(reset_n==0)) {
                m_reset_state = 0;
                m_reset_counts = 0;
        } else if (m_reset_state < 16) {
                switch(m_reset_state) {
                case 0:
                        m_reset_counts++;
                        if (reset_n) {
                                assert(m_reset_counts > 40000);
                                m_reset_counts = 0;
                                m_reset_state = 1;
                        } break;
                case 1:
                        m_reset_counts++;
                        if (cke) {
                                assert(m_reset_counts > 100000);
                                m_reset_counts = 0;
                                m_reset_state = 2;
                        } break;
                case 2:
                        m_reset_counts++;
                        assert(cke);
                        if (cmd != DDR_NOOP) {
                                assert(m_reset_counts > 147);
                                m_reset_counts = 0;
                                m_reset_state = 3;
                                assert(cmd == DDR_MRSET);
                                assert(ba == 2);
                                assert(addr == 0x040);
                        } break;
                case 3:
                        m_reset_counts++;
                        assert(cke);
                        if (cmd != DDR_NOOP) {
                                // assert(m_reset_counts > 3);
                                m_reset_counts = 0;
                                m_reset_state = 4;
                                assert(cmd == DDR_MRSET);
                                // assert(ba == 1);
                                // assert(addr == 0x847);
                        } break;
                case 4:
                        m_reset_counts++;
                        assert(cke);
                        if (cmd != DDR_NOOP) {
                                printf(PREFIX "::RESET-CMD[4]: %d:%08x[%d]@0x%04x\n", cmd, m_reset_counts, ba, addr);
                                assert(m_reset_counts > 3);
                                m_reset_counts = 0;
                                m_reset_state = 5;
                                assert(cmd == DDR_MRSET);
                                assert(ba == 0);
                                assert(addr == 0x210);
                        } break;
                case 5:
                        m_reset_counts++;
                        assert(cke);
                        if (cmd != DDR_NOOP) {
                                printf(PREFIX "::RESET-CMD[5]: %d:%08x[%d]@0x%04x\n", cmd, m_reset_counts, ba, addr);
                                assert(m_reset_counts > 11);
                                m_reset_counts = 0;
                                m_reset_state = 6;
                                assert(cmd == DDR_ZQS);
                                assert(addr == 0x400);
                        } break;
                case 6:
                        m_reset_counts++;
                        assert(cke);
                        if (cmd != DDR_NOOP) {
                                printf(PREFIX "::RESET-CMD[6]: %d:%08x[%d]@0x%04x\n", cmd, m_reset_counts, ba, addr);
                                assert(m_reset_counts > 512);
                                m_reset_counts = 0;
                                m_reset_state = 7;
                                assert(cmd == DDR_PRECHARGE);
                                assert(addr == 0x400);
                        } break;
                case 7:
                        m_reset_counts++;
                        assert(cke);
                        if (cmd != DDR_NOOP) {
                                printf(PREFIX "::RESET-CMD[7]: %d:%08x[%d]@0x%04x\n", cmd, m_reset_counts, ba, addr);
                                assert(m_reset_counts > 3);
                                m_reset_counts = 0;
                                m_reset_state = 8;
                                assert(cmd == DDR_REFRESH);
                                m_clocks_since_refresh = 0;
                        } break;
                case 8:
                        m_reset_counts++;
                        assert(cke);
                        assert(cmd == DDR_NOOP);
                        if (m_reset_counts > 140) {
                                m_reset_state = 16;
                                printf(PREFIX ": Leaving reset state\n");
                        }
                        break;
                default:
                        break;
                }
 
                gbl_state = m_reset_state;
                gbl_counts= m_reset_counts;
                m_nrefresh_issued = nREF;
                m_clocks_since_refresh++;
        } else if (!cke) {
                assert(0&&"Clock not enabled!");
        } else if ((cmd == DDR_REFRESH)||(m_nrefresh_issued < (int)nREF)) {
                if (DDR_REFRESH == cmd) {
                        m_clocks_since_refresh = 0;
                        if (m_nrefresh_issued >= (int)nREF)
                                m_nrefresh_issued = 1;
                        else
                                m_nrefresh_issued++;
                } else {
                        m_clocks_since_refresh++;
                        assert(DDR_NOOP == cmd);
                }
                for(int i=0; i<NBANKS; i++)
                        m_bank[i].tick(DDR_REFRESH,0);
 
                if (m_nrefresh_issued == nREF)
                        printf(PREFIX "::Refresh cycle complete\n");
        } else {
                // In operational mode!!
 
                m_clocks_since_refresh++;
                assert(m_clocks_since_refresh < (int)ckREFIn);
                switch(cmd) {
                case DDR_MRSET:
                        assert(0&&"Modes should only be set in reset startup");
                        for(int i=0; i<NBANKS; i++)
                                m_bank[i].tick(DDR_MRSET,0);
                        break;
                case DDR_REFRESH:
                        for(int i=0; i<NBANKS; i++)
                                m_bank[i].tick(DDR_REFRESH,0);
                        m_clocks_since_refresh = 0;
                        assert(0 && "Internal err: Refresh should be handled above");
                        break;
                case DDR_PRECHARGE:
                        if (addr & 0x40) {
                                // Precharge all
                                for(int i=0; i<NBANKS; i++)
                                        m_bank[i].tick(DDR_PRECHARGE,0);
                        } else {
                                m_bank[ba].tick(DDR_PRECHARGE,0);
                                for(int i=0; i<NBANKS; i++)
                                        if (ba != i)
                                                m_bank[i].tick(DDR_NOOP,0);
                        }
                        break;
                case DDR_ACTIVATE:
                        assert(m_clocks_since_refresh >= (int)ckRFC);
                        m_bank[ba].tick(DDR_ACTIVATE,addr);
                        for(int i=0; i<NBANKS; i++)
                                if (i!=ba) m_bank[i].tick(DDR_NOOP,0);
                        break;
                case DDR_WRITE:
                        {
                                // This SIM doesn't handle out of order writes
                                assert((addr&7)==0);
                                m_bank[ba].tick(DDR_WRITE, addr);
                                for(int i=0; i<NBANKS; i++)
                                        if (i!=ba)m_bank[i].tick(DDR_NOOP,addr);
                                unsigned caddr = m_bank[ba].m_row;
                                caddr <<= 3;
                                caddr |= ba;
                                caddr <<= 10;
                                caddr |= addr;
                                caddr &= ~7;
                                caddr >>= 1;
 
                                BUSTIMESLOT *tp;
                                int     offset = m_busloc+ckCL+1;
 
                                tp = &m_bus[(offset+0)&(NTIMESLOTS-1)];
                                // printf("Setting bus timeslots from (now=%d)+%d=%d to now+%d+3\n", m_busloc, ckCL,(m_busloc+ckCL)&(NTIMESLOTS-1), ckCL);
                                tp->m_addr = caddr  ;
                                tp->m_used = 1;
                                tp->m_read = 0;
 
                                tp = &m_bus[(offset+1)&(NTIMESLOTS-1)];
                                tp->m_addr = caddr+1;
                                tp->m_used = 1;
                                tp->m_read = 0;
 
                                tp = &m_bus[(offset+2)&(NTIMESLOTS-1)];
                                tp->m_addr = caddr+2;
                                tp->m_used = 1;
                                tp->m_read = 0;
 
                                tp = &m_bus[(offset+3)&(NTIMESLOTS-1)];
                                tp->m_addr = caddr+3;
                                tp->m_used = 1;
                                tp->m_read = 0;
                        } break;
                case DDR_READ:
                        {
                                // This SIM doesn't handle out of order reads
                                assert((addr&7)==0);
                                m_bank[ba].tick(DDR_READ, addr);
                                for(int i=0; i<NBANKS; i++)
                                        if (i!=ba)m_bank[i].tick(DDR_NOOP,addr);
                                unsigned caddr = m_bank[ba].m_row;
                                caddr <<= 3;
                                caddr |= ba;
                                caddr <<= 10;
                                caddr |= addr;
                                caddr &= ~7;
                                caddr >>= 1;
 
                                BUSTIMESLOT *tp;
 
                                int offset = (m_busloc+ckCL+1)&(NTIMESLOTS-1);
                                tp = &m_bus[(offset)&(NTIMESLOTS-1)];
                                tp->m_data = m_mem[caddr];
                                tp->m_addr = caddr;
                                tp->m_used = 1;
                                tp->m_read = 1;
 
                                tp = &m_bus[(offset+1)&(NTIMESLOTS-1)];
                                tp->m_data = m_mem[caddr+1];
                                tp->m_addr = caddr+1;
                                tp->m_used = 1;
                                tp->m_read = 1;
 
                                tp = &m_bus[(offset+2)&(NTIMESLOTS-1)];
                                tp->m_data = m_mem[caddr+2];
                                tp->m_addr = caddr+2;
                                tp->m_used = 1;
                                tp->m_read = 1;
 
                                tp = &m_bus[(offset+3)&(NTIMESLOTS-1)];
                                tp->m_data = m_mem[caddr+3];
                                tp->m_addr = caddr+3;
                                tp->m_used = 1;
                                tp->m_read = 1;
                        } break;
                case DDR_ZQS:
                        assert(0&&"Sim does not support ZQS outside of startup");
                        break;
                case DDR_NOOP:
                        for(int i=0; i<NBANKS; i++)
                                m_bank[i].tick(DDR_NOOP,addr);
                        break;
                default: // We are deselecteda
                        for(int i=0; i<NBANKS; i++)
                                m_bank[i].tick(DDR_NOOP,addr);
                        break;
                }
        }
 
        m_busloc = (m_busloc+1)&(NTIMESLOTS-1);
 
        BUSTIMESLOT     *ts = &m_bus[m_busloc];
        unsigned vl = ts->m_data;
        assert( ((!ts->m_used)||(busoe))
                || ((ts->m_used)&&(ts->m_read)));
 
        assert((!ts->m_used)||(ts->m_addr < (unsigned)m_memlen));
        if ((ts->m_used)&&(!ts->m_read)&&(!dm)) {
                printf(PREFIX "::Setting MEM[%08x] = %08x\n", ts->m_addr, data);
                m_mem[ts->m_addr] = data;
        }
        ts->m_used = 0;
        ts->m_read = 0;
        ts->m_addr = -1;
        return (!busoe)?vl:data;
}
 

Line No.	Rev	Author	Line
1	4	dgisselq	`////////////////////////////////////////////////////////////////////////////////`
2			`//`
3			`// Filename: ddrsdramsim.cpp`
4			`//`
5			`// Project: A wishbone controlled DDR3 SDRAM memory controller.`
6			`//`
7			`// Purpose:`
8			`//`
9			`// Creator: Dan Gisselquist, Ph.D.`
10			`// Gisselquist Technology, LLC`
11			`//`
12			`////////////////////////////////////////////////////////////////////////////////`
13			`//`
14			`// Copyright (C) 2015-2016, Gisselquist Technology, LLC`
15			`//`
16			`// This program is free software (firmware): you can redistribute it and/or`
17			`// modify it under the terms of the GNU General Public License as published`
18			`// by the Free Software Foundation, either version 3 of the License, or (at`
19			`// your option) any later version.`
20			`//`
21			`// This program is distributed in the hope that it will be useful, but WITHOUT`
22			`// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or`
23			`// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License`
24			`// for more details.`
25			`//`
26			`// You should have received a copy of the GNU General Public License along`
27			`// with this program. (It's in the $(ROOT)/doc directory, run make with no`
28			`// target there if the PDF file isn't present.) If not, see`
29			`// <http://www.gnu.org/licenses/> for a copy.`
30			`//`
31			`// License: GPL, v3, as defined and found on www.gnu.org,`
32			`// http://www.gnu.org/licenses/gpl.html`
33			`//`
34			`//`
35			`////////////////////////////////////////////////////////////////////////////////`
36			`//`
37			`//`
38			`#include <stdio.h>`
39			`#include <assert.h>`
40
41	9	dgisselq	`#define PREFIX "DDR3-SDRAM"`
42	4	dgisselq	`const unsigned ckCL = 5,`
43	6	dgisselq	`ckRC = 3,`
44			`ckRFC = 320, // Clocks from refresh to activate`
45			`nREF = 4,`
46			`ckREFI = 1560, // 7.8us @ 200MHz = 7.8e-6 * 200e6 = 1560`
47			`ckREFIn = nREFckREFI - (nREF-1) ckRFC;`
48	4	dgisselq
49			`#include "ddrsdramsim.h"`
50			`void BANKINFO::tick(int cmd, unsigned addr) {`
51			`switch(cmd) {`
52			`case DDR_PRECHARGE:`
53	6	dgisselq	`m_state = 6;`
54	8	dgisselq	`// While the specification allows precharging an already`
55			`// precharged bank, we can keep that from happening`
56			`// here:`
57			`// assert(m_state&7);`
58			`// Only problem is, this will currently break our`
59			`// refresh logic.`
60	4	dgisselq	`break;`
61			`case DDR_ACTIVATE:`
62	6	dgisselq	`m_state = 1;`
63	4	dgisselq	`m_row = addr & 0x7fff;`
64			`break;`
65			`case DDR_READ: case DDR_WRITE:`
66	6	dgisselq	`printf("BANK::R/W Request, m_state = %d\n", m_state);`
67	4	dgisselq	`assert((m_state&7) == 7);`
68			`break;`
69			`case DDR_ZQS:`
70			`assert((m_state&7) == 0);`
71			`break;`
72			`case DDR_NOOP:`
73			`m_state <<= 1;`
74			`m_state \|= (m_state&2)>>1;`
75			`break;`
76			`default:`
77			`break;`
78			`}`
79			`}`
80
81			`int gbl_state, gbl_counts;`
82
83			`DDRSDRAMSIM::DDRSDRAMSIM(int lglen) {`
84			`m_memlen = (1<<(lglen-2));`
85			`m_mem = new unsigned[m_memlen];`
86			`m_reset_state = 0;`
87			`m_reset_counts= 0;`
88			`m_bus = new BUSTIMESLOT[NTIMESLOTS];`
89			`for(int i=0; i<NTIMESLOTS; i++)`
90			`m_bus[i].m_used = 0;`
91			`m_busloc = 0;`
92			`}`
93
94			`unsigned DDRSDRAMSIM::operator()(int reset_n, int cke,`
95			`int csn, int rasn, int casn, int wen,`
96			`int dqs, int dm, int odt, int busoe,`
97			`int addr, int ba, int data) {`
98
99			`int cmd = (reset_n?0:32)\|(cke?0:16)\|(csn?8:0)`
100			`\|(rasn?4:0)\|(casn?2:0)\|(wen?1:0);`
101			`if ((m_reset_state!=0)&&(reset_n==0)) {`
102			`m_reset_state = 0;`
103			`m_reset_counts = 0;`
104			`} else if (m_reset_state < 16) {`
105			`switch(m_reset_state) {`
106			`case 0:`
107			`m_reset_counts++;`
108			`if (reset_n) {`
109			`assert(m_reset_counts > 40000);`
110			`m_reset_counts = 0;`
111			`m_reset_state = 1;`
112			`} break;`
113			`case 1:`
114			`m_reset_counts++;`
115			`if (cke) {`
116			`assert(m_reset_counts > 100000);`
117			`m_reset_counts = 0;`
118			`m_reset_state = 2;`
119			`} break;`
120			`case 2:`
121			`m_reset_counts++;`
122	6	dgisselq	`assert(cke);`
123	4	dgisselq	`if (cmd != DDR_NOOP) {`
124			`assert(m_reset_counts > 147);`
125			`m_reset_counts = 0;`
126			`m_reset_state = 3;`
127			`assert(cmd == DDR_MRSET);`
128			`assert(ba == 2);`
129			`assert(addr == 0x040);`
130			`} break;`
131			`case 3:`
132			`m_reset_counts++;`
133	6	dgisselq	`assert(cke);`
134	4	dgisselq	`if (cmd != DDR_NOOP) {`
135	5	dgisselq	`// assert(m_reset_counts > 3);`
136	4	dgisselq	`m_reset_counts = 0;`
137			`m_reset_state = 4;`
138			`assert(cmd == DDR_MRSET);`
139	5	dgisselq	`// assert(ba == 1);`
140			`// assert(addr == 0x847);`
141	4	dgisselq	`} break;`
142			`case 4:`
143			`m_reset_counts++;`
144	6	dgisselq	`assert(cke);`
145	4	dgisselq	`if (cmd != DDR_NOOP) {`
146	9	dgisselq	`printf(PREFIX "::RESET-CMD[4]: %d:%08x[%d]@0x%04x\n", cmd, m_reset_counts, ba, addr);`
147	4	dgisselq	`assert(m_reset_counts > 3);`
148			`m_reset_counts = 0;`
149			`m_reset_state = 5;`
150			`assert(cmd == DDR_MRSET);`
151			`assert(ba == 0);`
152			`assert(addr == 0x210);`
153			`} break;`
154			`case 5:`
155			`m_reset_counts++;`
156	6	dgisselq	`assert(cke);`
157	4	dgisselq	`if (cmd != DDR_NOOP) {`
158	9	dgisselq	`printf(PREFIX "::RESET-CMD[5]: %d:%08x[%d]@0x%04x\n", cmd, m_reset_counts, ba, addr);`
159	5	dgisselq	`assert(m_reset_counts > 11);`
160	4	dgisselq	`m_reset_counts = 0;`
161			`m_reset_state = 6;`
162			`assert(cmd == DDR_ZQS);`
163	5	dgisselq	`assert(addr == 0x400);`
164	4	dgisselq	`} break;`
165			`case 6:`
166			`m_reset_counts++;`
167	6	dgisselq	`assert(cke);`
168	4	dgisselq	`if (cmd != DDR_NOOP) {`
169	9	dgisselq	`printf(PREFIX "::RESET-CMD[6]: %d:%08x[%d]@0x%04x\n", cmd, m_reset_counts, ba, addr);`
170	4	dgisselq	`assert(m_reset_counts > 512);`
171			`m_reset_counts = 0;`
172			`m_reset_state = 7;`
173			`assert(cmd == DDR_PRECHARGE);`
174	5	dgisselq	`assert(addr == 0x400);`
175	4	dgisselq	`} break;`
176			`case 7:`
177			`m_reset_counts++;`
178	6	dgisselq	`assert(cke);`
179	4	dgisselq	`if (cmd != DDR_NOOP) {`
180	9	dgisselq	`printf(PREFIX "::RESET-CMD[7]: %d:%08x[%d]@0x%04x\n", cmd, m_reset_counts, ba, addr);`
181	4	dgisselq	`assert(m_reset_counts > 3);`
182			`m_reset_counts = 0;`
183			`m_reset_state = 8;`
184			`assert(cmd == DDR_REFRESH);`
185	6	dgisselq	`m_clocks_since_refresh = 0;`
186	4	dgisselq	`} break;`
187			`case 8:`
188			`m_reset_counts++;`
189	6	dgisselq	`assert(cke);`
190	4	dgisselq	`assert(cmd == DDR_NOOP);`
191	5	dgisselq	`if (m_reset_counts > 140) {`
192	4	dgisselq	`m_reset_state = 16;`
193	9	dgisselq	`printf(PREFIX ": Leaving reset state\n");`
194	5	dgisselq	`}`
195	4	dgisselq	`break;`
196			`default:`
197			`break;`
198			`}`
199
200			`gbl_state = m_reset_state;`
201			`gbl_counts= m_reset_counts;`
202	6	dgisselq	`m_nrefresh_issued = nREF;`
203	7	dgisselq	`m_clocks_since_refresh++;`
204	6	dgisselq	`} else if (!cke) {`
205	4	dgisselq	`assert(0&&"Clock not enabled!");`
206	6	dgisselq	`} else if ((cmd == DDR_REFRESH)\|\|(m_nrefresh_issued < (int)nREF)) {`
207			`if (DDR_REFRESH == cmd) {`
208			`m_clocks_since_refresh = 0;`
209			`if (m_nrefresh_issued >= (int)nREF)`
210	7	dgisselq	`m_nrefresh_issued = 1;`
211	6	dgisselq	`else`
212			`m_nrefresh_issued++;`
213			`} else {`
214			`m_clocks_since_refresh++;`
215			`assert(DDR_NOOP == cmd);`
216			`}`
217			`for(int i=0; i<NBANKS; i++)`
218			`m_bank[i].tick(DDR_REFRESH,0);`
219	7	dgisselq
220			`if (m_nrefresh_issued == nREF)`
221	9	dgisselq	`printf(PREFIX "::Refresh cycle complete\n");`
222	6	dgisselq	`} else {`
223			`// In operational mode!!`
224
225			`m_clocks_since_refresh++;`
226			`assert(m_clocks_since_refresh < (int)ckREFIn);`
227			`switch(cmd) {`
228	4	dgisselq	`case DDR_MRSET:`
229			`assert(0&&"Modes should only be set in reset startup");`
230			`for(int i=0; i<NBANKS; i++)`
231			`m_bank[i].tick(DDR_MRSET,0);`
232			`break;`
233			`case DDR_REFRESH:`
234			`for(int i=0; i<NBANKS; i++)`
235			`m_bank[i].tick(DDR_REFRESH,0);`
236	6	dgisselq	`m_clocks_since_refresh = 0;`
237			`assert(0 && "Internal err: Refresh should be handled above");`
238	4	dgisselq	`break;`
239			`case DDR_PRECHARGE:`
240			`if (addr & 0x40) {`
241			`// Precharge all`
242			`for(int i=0; i<NBANKS; i++)`
243			`m_bank[i].tick(DDR_PRECHARGE,0);`
244			`} else {`
245			`m_bank[ba].tick(DDR_PRECHARGE,0);`
246			`for(int i=0; i<NBANKS; i++)`
247			`if (ba != i)`
248			`m_bank[i].tick(DDR_NOOP,0);`
249			`}`
250			`break;`
251			`case DDR_ACTIVATE:`
252	7	dgisselq	`assert(m_clocks_since_refresh >= (int)ckRFC);`
253	4	dgisselq	`m_bank[ba].tick(DDR_ACTIVATE,addr);`
254			`for(int i=0; i<NBANKS; i++)`
255			`if (i!=ba) m_bank[i].tick(DDR_NOOP,0);`
256			`break;`
257			`case DDR_WRITE:`
258			`{`
259	6	dgisselq	`// This SIM doesn't handle out of order writes`
260			`assert((addr&7)==0);`
261			`m_bank[ba].tick(DDR_WRITE, addr);`
262	4	dgisselq	`for(int i=0; i<NBANKS; i++)`
263	6	dgisselq	`if (i!=ba)m_bank[i].tick(DDR_NOOP,addr);`
264	7	dgisselq	`unsigned caddr = m_bank[ba].m_row;`
265	8	dgisselq	`caddr <<= 3;`
266	7	dgisselq	`caddr \|= ba;`
267			`caddr <<= 10;`
268			`caddr \|= addr;`
269			`caddr &= ~7;`
270			`caddr >>= 1;`
271	4	dgisselq
272			`BUSTIMESLOT *tp;`
273	7	dgisselq	`int offset = m_busloc+ckCL+1;`
274	4	dgisselq
275	7	dgisselq	`tp = &m_bus[(offset+0)&(NTIMESLOTS-1)];`
276	9	dgisselq	`// printf("Setting bus timeslots from (now=%d)+%d=%d to now+%d+3\n", m_busloc, ckCL,(m_busloc+ckCL)&(NTIMESLOTS-1), ckCL);`
277	7	dgisselq	`tp->m_addr = caddr ;`
278	4	dgisselq	`tp->m_used = 1;`
279			`tp->m_read = 0;`
280
281	7	dgisselq	`tp = &m_bus[(offset+1)&(NTIMESLOTS-1)];`
282			`tp->m_addr = caddr+1;`
283	4	dgisselq	`tp->m_used = 1;`
284			`tp->m_read = 0;`
285
286	7	dgisselq	`tp = &m_bus[(offset+2)&(NTIMESLOTS-1)];`
287			`tp->m_addr = caddr+2;`
288	4	dgisselq	`tp->m_used = 1;`
289			`tp->m_read = 0;`
290
291	7	dgisselq	`tp = &m_bus[(offset+3)&(NTIMESLOTS-1)];`
292			`tp->m_addr = caddr+3;`
293	4	dgisselq	`tp->m_used = 1;`
294			`tp->m_read = 0;`
295			`} break;`
296			`case DDR_READ:`
297			`{`
298	6	dgisselq	`// This SIM doesn't handle out of order reads`
299			`assert((addr&7)==0);`
300			`m_bank[ba].tick(DDR_READ, addr);`
301	4	dgisselq	`for(int i=0; i<NBANKS; i++)`
302	6	dgisselq	`if (i!=ba)m_bank[i].tick(DDR_NOOP,addr);`
303	7	dgisselq	`unsigned caddr = m_bank[ba].m_row;`
304	8	dgisselq	`caddr <<= 3;`
305	7	dgisselq	`caddr \|= ba;`
306			`caddr <<= 10;`
307			`caddr \|= addr;`
308			`caddr &= ~7;`
309			`caddr >>= 1;`
310	4	dgisselq
311			`BUSTIMESLOT *tp;`
312
313	8	dgisselq	`int offset = (m_busloc+ckCL+1)&(NTIMESLOTS-1);`
314			`tp = &m_bus[(offset)&(NTIMESLOTS-1)];`
315	7	dgisselq	`tp->m_data = m_mem[caddr];`
316			`tp->m_addr = caddr;`
317	4	dgisselq	`tp->m_used = 1;`
318			`tp->m_read = 1;`
319
320	8	dgisselq	`tp = &m_bus[(offset+1)&(NTIMESLOTS-1)];`
321	7	dgisselq	`tp->m_data = m_mem[caddr+1];`
322			`tp->m_addr = caddr+1;`
323	4	dgisselq	`tp->m_used = 1;`
324			`tp->m_read = 1;`
325
326	8	dgisselq	`tp = &m_bus[(offset+2)&(NTIMESLOTS-1)];`
327	7	dgisselq	`tp->m_data = m_mem[caddr+2];`
328			`tp->m_addr = caddr+2;`
329	4	dgisselq	`tp->m_used = 1;`
330			`tp->m_read = 1;`
331
332	8	dgisselq	`tp = &m_bus[(offset+3)&(NTIMESLOTS-1)];`
333	7	dgisselq	`tp->m_data = m_mem[caddr+3];`
334			`tp->m_addr = caddr+3;`
335	4	dgisselq	`tp->m_used = 1;`
336			`tp->m_read = 1;`
337			`} break;`
338			`case DDR_ZQS:`
339			`assert(0&&"Sim does not support ZQS outside of startup");`
340			`break;`
341			`case DDR_NOOP:`
342			`for(int i=0; i<NBANKS; i++)`
343			`m_bank[i].tick(DDR_NOOP,addr);`
344			`break;`
345			`default: // We are deselecteda`
346			`for(int i=0; i<NBANKS; i++)`
347			`m_bank[i].tick(DDR_NOOP,addr);`
348			`break;`
349	6	dgisselq	`}`
350	4	dgisselq	`}`
351
352			`m_busloc = (m_busloc+1)&(NTIMESLOTS-1);`
353
354			`BUSTIMESLOT *ts = &m_bus[m_busloc];`
355			`unsigned vl = ts->m_data;`
356			`assert( ((!ts->m_used)\|\|(busoe))`
357			`\|\| ((ts->m_used)&&(ts->m_read)));`
358
359			`assert((!ts->m_used)\|\|(ts->m_addr < (unsigned)m_memlen));`
360	7	dgisselq	`if ((ts->m_used)&&(!ts->m_read)&&(!dm)) {`
361	9	dgisselq	`printf(PREFIX "::Setting MEM[%08x] = %08x\n", ts->m_addr, data);`
362	4	dgisselq	`m_mem[ts->m_addr] = data;`
363	7	dgisselq	`}`
364	4	dgisselq	`ts->m_used = 0;`
365			`ts->m_read = 0;`
366			`ts->m_addr = -1;`
367			`return (!busoe)?vl:data;`
368			`}`
369

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[/] [wbddr3/] [trunk/] [bench/] [cpp/] [ddrsdramsim.cpp] - Blame information for rev 9