Subversion Repositories wbddr3

////////////////////////////////////////////////////////////////////////////////
//
// Filename: 	pddrsim.cpp
//
// Project:	A wishbone controlled DDR3 SDRAM memory controller.
//
// Purpose:	To expand a DDR3 SDRAM controllers influence across multiple
//		clocks.  Hence, if the DDR3 SDRAM controller runs at half
//	the clock rate of the DDR3-SDRAM, this will expand it to the full
//	clock rate.
//
// Creator:	Dan Gisselquist, Ph.D.
//		Gisselquist Technology, LLC
//
////////////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 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 <stdlib.h>
#include "ddrsdramsim.h"
#include "pddrsim.h"
 
unsigned long PDDRSIM::operator()(int reset_n, int cke, int busoe,
		unsigned cmda, unsigned cmdb, unsigned long data) {
	int	csn, rasn, casn, wen, dqs, dm, odt, addr, ba;
	unsigned	hdata, ldata;
	unsigned long	odata;
 
	// if ((reset_n)&&(cke)) printf("PDDR: %08x/%08x/%016lx\n", cmda, cmdb, data);
	csn  = (cmda >> 26)&1;
	rasn = (cmda >> 25)&1;
	casn = (cmda >> 24)&1;
	wen  = (cmda >> 23)&1;
	ba   = (cmda >> 20)&0x7;	//  3 bits
	addr = (cmda >>  6)&0x3fff;	// 14 bits
	dqs  = (cmda >>  5)&0x01;	//  1 bits
	dm   = (cmda >>  1)&0x0f;	//  4 bits
	odt  = (cmda      )&0x01;	//  1 bits
 
	// if ((reset_n)&&(cke)) printf("PDDR: %s/%02x/%s\n", (dqs)?"DQS":"   ",dm,(odt)?"ODT":"   ");
 
	hdata = DDRSDRAMSIM::apply(reset_n, cke, csn, rasn, casn, wen,
			dqs, dm, odt, busoe, addr, ba, (unsigned)(data>>32));
 
	csn  = (cmdb >> 26)&1;
	rasn = (cmdb >> 25)&1;
	casn = (cmdb >> 24)&1;
	wen  = (cmdb >> 23)&1;
	ba   = (cmdb >> 20)&0x7;	//  3 bits
	addr = (cmdb >>  6)&0x3fff;	// 14 bits
	dqs  = (cmdb >>  5)&0x01;	//  1 bits
	dm   = (cmdb >>  1)&0x0f;	//  4 bits
	odt  = (cmdb      )&0x01;	//  1 bits
 
	// if ((reset_n)&&(cke)) printf("PDDR: %s/%02x/%s\n", (dqs)?"DQS":"   ",dm,(odt)?"ODT":"   ");
 
	ldata = DDRSDRAMSIM::apply(reset_n, cke, csn, rasn, casn, wen,
			dqs, dm, odt, busoe, addr, ba, (unsigned)(data&(~(-1l<<32))));
 
 
	odata = (((unsigned long)hdata)<<32)|((unsigned long)ldata);
	return odata;
}