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;Formatted version of cfreader.psm generated by KCPSMBLE.;;--===========================================================================--;--;-- CF SECTOR READER;--;-- - SEPTEMBER 2002;-- - UPV / EHU.;--;-- Design units : FAT32 FILE LOADER;--;-- File name : cf_sector_reader.txt;--;-- Purpose : READ RAW SECTORS FROM CF;--;-- Library : -;--;-- Languaje : ASSEMBLER FOR XILINX PICOBLAZE;--;-- Compiler : KCPSM ASSEMBLER V1.25;--;-- Debugger : PSM DEBUG V1.00;--===========================================================================--;-------------------------------------------------------------------------------;-- Revision list;-- Version Author Date Changes;--;-- 260902 Armando Astarloa 27 September 2002 -;-- 241002 Armando Astarloa 27 October 2002 Reset on error;-- 031202 Armando Astarloa 27 December 2002 Load LBA information from data bus;-- 120103 Armando Astarloa 12 January 2003 Quit status check when words reading;-- 290103 Armando Astarloa 29 January 2003 Reset function. Reset after error;-- 050503 Armando Astarloa 02 May 2003 Allow not all bytes of the sector readed.;-- do_reset_and_retry state;-- 160503 Armando Astarloa 02 May 2003 Complete sector reading;--;-------------------------------------------------------------------------------;-- Description : DUMMY CF SECTORS READ;-------------------------------------------------------------------------------;--;-- CONSTANT DEFINITIONS;--CONSTANT DELAY1,03; 50 MHZ DELAY1 => T(clk_i) => fastloop=DELAY1*T*2= 120ns sF=1 => delay= sF*fastloop; 50 MHZ DELAY1=03 => T=20NS => fastloop=3*20*2= 120ns sF=1 => delay= 120nsCONSTANT IDENTIFY_COMMAND,ECCONSTANT WRITE_SECTOR_COMMAND,30CONSTANT READ_SECTOR_COMMAND,20CONSTANT WRITE_SEC_FEATURE,00CONSTANT SOFT_RESET,04;--;-- RAM REGISTERS;--;; s0; s1; s2; s3 -> WISHBONE CONTROL; s4 -> REGISTERS STACK; s5 -> MY_STATUS; D3 = ERROR; D2 = DATA TRANSFER ALLOWED (0 NOT / 1 YES); D1 = COMMAND ALLOWED (NOT BUSY) (0 NOT / 1 YES); D0 = SECTOR AVAILABLE (0 NOT / 1 YES)CONSTANT SECTOR_AVAILABLE,01CONSTANT COMMAND_ALLOWED,02CONSTANT DATA_TRANSFER_ALLOWED,04CONSTANT ERROR_MY_STATUS,08; s6 -> WORDS_READED; s7 -> LBA_7_0; s8 -> LBA_15_8; s9 -> LBA_23_16; sA -> LD_LBA_27_24; sB -> data[7:0] in ide; sC -> data[15:8] in ide; sD -> data[7:0] out ide; sE -> data[15:8] out ide; sF -> acummulator;;--;-- OUTPUT PORTS;--;--;-- IDE INTERFACE PORTS - OUTPUTS;--CONSTANT DATA_IDE_OUT_7_0,00CONSTANT DATA_IDE_OUT_15_8,01CONSTANT IDE_CONTROL_OUT,02; D7 =; D6 =; D5 =; D4 =; D3 =; D2 =; D1 = NIOWR; D0 = NIORDCONSTANT NIOWR,FDCONSTANT NIORD,FECONSTANT IDE_ADDRESS_OUT,03; D7 =; D6 =; D5 =; D4 = NCE1; D3 = NCE0; D2 = A2; D1 = A1; D0 = A0;; WRITE IDE REGISTERS;; NCE1/NCE0/ A2/ A1/ A0CONSTANT CONTROL,0E ; 000 0 1 1 1 0CONSTANT DATA,10 ; 000 1 0 0 0 0CONSTANT FEATURE,11 ; 000 1 0 0 0 1CONSTANT SECTOR_COUNT,12 ; 000 1 0 0 1 0CONSTANT LBA_7_0,13 ; 000 1 0 0 1 1CONSTANT LBA_15_8,14 ; 000 1 0 1 0 0CONSTANT LBA_23_16,15 ; 000 1 0 1 0 1CONSTANT LD_LBA_27_24,16 ; 000 1 0 1 1 0CONSTANT COMMAND,17 ; 000 1 0 1 1 1CONSTANT CF_OFF,18 ; 000 1 1 0 0 0;; READ IDE REGISTERS; NCE1/NCE0/ A2/ A1/ A0CONSTANT A_STATUS,0E ; 000 0 1 1 1 0CONSTANT STATUS,17 ; 000 1 0 1 1 1;--;-- WISHBONE INTERFACE PORTS - OUTPUTS;--CONSTANT DATA_WB_OUT_7_0,04CONSTANT DATA_WB_OUT_15_8,05CONSTANT CONTROL_WB_OUT,06; D7 =; D6 =; D5 =; D4 =; D3 =; D2 =; D1 = TAG0_WORD_AVAILABLE; D0 = ACK_CF_READERCONSTANT ACK_CF_READER,01CONSTANT TAG0_WORD_AVAILABLE,02;--;-- BUS CONTROL SIGNALS;--CONSTANT CONTROL_OUT,07; D7 =; D6 =; D5 =; D4 =; D3 =; D2 = ERROR; D1 = WB_BUS_WRITE_ENABLE; D0 = IDE_BUS_WRITE_ENABLECONSTANT IDE_BUS_WRITE_ENABLE,01CONSTANT WB_BUS_WRITE_ENABLE,02CONSTANT ERROR,04;--;-- INPUT PORTS;--;--;-- IDE INTERFACE PORTS - INPUTS;--CONSTANT DATA_IDE_IN_7_0,00CONSTANT DATA_IDE_IN_15_8,01;--;-- WISHBONE INTERFACE PORTS - INPUTS;--CONSTANT CONTROL_WB_IN,02; D7 =; D6 =; D5 =; D4 = WB_A0; D3 = RESET; D2 = W_WE; D1 = TAG1_WORD_REQUEST; D0 = STROBE_CF_READER;; STROBE_CF_READER = 1 & W_WE=1 & WB_A0 = 0CONSTANT WRITE_LBA_15_0,05; STROBE_CF_READER = 1 & W_WE=1 & WB_A0 = 1CONSTANT WRITE_LBA_27_16,15CONSTANT STROBE_CF_READER_AND_RD,01CONSTANT TAG1_WORD_REQUEST,02CONSTANT W_WE,04CONSTANT RESET,08;;--;-- WISHBONE INTERFACE PORTS - INPUTS;--CONSTANT DATA_WB_IN_7_0,03CONSTANT DATA_WB_IN_15_8,04;--;-- REGISTERS INITIALIZATION;--inicialization:;; BUS CONTROL : WRITE NOT ENABLE;LOAD sF,00OUTPUT sF,CONTROL_OUT;; WISHBONE BUS INIZIALIZATION;LOAD sF,00OUTPUT sF,DATA_WB_OUT_7_0OUTPUT sF,DATA_WB_OUT_15_8OUTPUT sF,CONTROL_WB_OUT;; IDE BUS INICIALIZATION;LOAD sF,00OUTPUT sF,DATA_IDE_OUT_7_0OUTPUT sF,DATA_IDE_OUT_15_8LOAD sF,18OUTPUT sF,IDE_ADDRESS_OUTLOAD sF,FFOUTPUT sF,IDE_CONTROL_OUT;; WAIT FOR 210NS*31 (RESET DELAY);LOAD s5,00LOAD s6,00LOAD sF,FFCALL wait_loopCALL soft_resetLOAD sF,FFCALL wait_loopLOAD sF,FFCALL wait_loopLOAD sF,FFCALL wait_loopmain:;; CHECK WISHBONE BUS;; wait state for stb_i deassertion;LOAD sF,01;CALL wait_loopAND sF,sFAND sF,sFAND sF,sFAND sF,sFINPUT s3,CONTROL_WB_IN;; CHECK RESET;LOAD sF,s3AND sF,RESET; DO RESETJUMP NZ,inicialization;; CHECK STROBE & READ;LOAD sF,s3SUB sF,WRITE_LBA_15_0JUMP Z,store_lba_15_0LOAD sF,s3SUB sF,WRITE_LBA_27_16JUMP Z,store_lba_27_16LOAD sF,s3SUB sF,STROBE_CF_READER_AND_RDJUMP Z,put_data_in_wb_bus;; IF NOT READ REQUEST MAINTAIN SIGNAL;LOAD sF,00OUTPUT sF,CONTROL_OUTOUTPUT sF,CONTROL_WB_OUTJUMP mainstore_lba_15_0:; DATA_WB_IN_7_0 -> s7 LBA_7_0INPUT s7,DATA_WB_IN_7_0; DATA_WB_IN_15_8 -> s8 LBA_15_8INPUT s8,DATA_WB_IN_15_8; SECTOR AVAILABLE / COMMAND AVAILABLE -> 0LOAD sF,00AND s5,sFJUMP wishbone_ackstore_lba_27_16:; DATA_WB_IN_7_0 -> s9 LBA_23_16INPUT s9,DATA_WB_IN_7_0; DATA_WB_IN_15_8 -> s10 LD_LBA_27_24INPUT sA,DATA_WB_IN_15_8; SECTOR AVAILABLE -> 0; antes 020503 LOAD sF,FELOAD sF,00AND s5,sFJUMP wishbone_ackdo_reset_and_retry:CALL soft_resetLOAD s5,00put_data_in_wb_bus:CALL read_word_from_cf; check for errorLOAD sF,s5AND sF,ERROR_MY_STATUSJUMP NZ,do_reset_and_retryOUTPUT sB,DATA_WB_OUT_7_0OUTPUT sC,DATA_WB_OUT_15_8;; ENABLE WB ENABLE;LOAD sF,WB_BUS_WRITE_ENABLEOUTPUT sF,CONTROL_OUTwishbone_ack:;; WISHBONE ACK;LOAD sF,ACK_CF_READEROUTPUT sF,CONTROL_WB_OUT; null - wait state;AND sF,sFAND sF,sFAND sF,sFAND sF,sF; WISHBONE MASTER MUST CHECK ACK SIGNAL; IN THE RISING EDGE OF THE CLOCK AND DEASSERT; STROBE SIGNAL. SLAVE AUTOMATICALLY DEASSERT ACK;LOAD sF,00OUTPUT sF,CONTROL_WB_OUT;OUTPUT sF,CONTROL_OUTJUMP mainwait_loop:;; SOFTWARE DELAY LOOP; TAKES SLOW LOOP VALUE FROM sF;; TWO CYCLES PER INSTRUCTION;; SLOW LOOP 3 INSTRUCTIONS * sF; FAST LOOP 2 INSTRUCTIONS * DELAY1; 50 MHZ DELAY1=0A => T=20NS => fl=3*20*2= 120ns sF=1 => delay= 120nsLOAD s1,sFslow_loop:LOAD s0,DELAY1fast_loop:SUB s0,01JUMP NZ,fast_loopSUB s1,01JUMP NZ,slow_loopRETURNwrite_ide_register:;; TAKE ADDRESS FROM SF REGISTER AND IT'S PUT INTO THE PORT;OUTPUT sF,IDE_ADDRESS_OUT;; DATA OUT IDE;OUTPUT sD,DATA_IDE_OUT_7_0OUTPUT sE,DATA_IDE_OUT_15_8;; DATA OUT BUS ENABLE;LOAD sF,IDE_BUS_WRITE_ENABLEOUTPUT sF,CONTROL_OUT;; WAIT FOR 70 NS (MIN); (120ns/50Mhz)LOAD sF,01CALL wait_loop;; WRITE STROBE ON;LOAD sF,NIOWROUTPUT sF,IDE_CONTROL_OUT;; WAIT FOR 165NS (MIN); (240ns/50Mhz); 020503LOAD sF,02CALL wait_loop;; WRITE STROBE OFF;LOAD sF,FFOUTPUT sF,IDE_CONTROL_OUT;; WAIT FOR 20NS (MIN); (410ns/50Mhz); 020503;LOAD sF,01;CALL wait_loop;; CE AND ADRESSES OFF;LOAD sF,CF_OFFOUTPUT sF,IDE_ADDRESS_OUT;; WAIT FOR 30NS (MIN) (if delay of the two previos inst>30ns this is not necessary); (put again 020503)LOAD sF,01CALL wait_loop;; DATA OUT BUS DISABLE;LOAD sF,00OUTPUT sF,CONTROL_OUT;; (put again 020503)LOAD sF,02CALL wait_loopRETURNread_ide_register:;; TAKE ADDRESS FROM SF REGISTER AND IT'S PUT INTO THE PORT;OUTPUT sF,IDE_ADDRESS_OUT;; WAIT FOR 70 NS (MIN);LOAD sF,01CALL wait_loop;; READ STROBE ON; reset control_out (140503)LOAD sF,00OUTPUT sF,CONTROL_OUTLOAD sF,NIORDOUTPUT sF,IDE_CONTROL_OUT;; WAIT FOR 165NS (MIN);LOAD sF,02CALL wait_loop;; TAKE DE DATA FROM IDE BUS;INPUT sB,DATA_IDE_IN_7_0INPUT sC,DATA_IDE_IN_15_8;; READ STROBE OFF;LOAD sF,FFOUTPUT sF,IDE_CONTROL_OUT;; WAIT FOR 20NS (MIN);;LOAD sF,01;CALL wait_loop;; CE AND ADRESSES OFF;LOAD sF,CF_OFFOUTPUT sF,IDE_ADDRESS_OUT;; WAIT FOR 20NS (MIN); (120ns/50mhz);LOAD sF,01;CALL wait_loopRETURNread_sector:;; WRITE ATA COMMANDS TO THE CF;;; IDE FEATURE REGISTER;LOAD sD,WRITE_SEC_FEATURELOAD sF,FEATURECALL write_ide_register;; IDE SECTOR COUNT REGISTER;LOAD sD,01LOAD sF,SECTOR_COUNTCALL write_ide_register;; IDE LBA_7_0;LOAD sD,s7LOAD sF,LBA_7_0CALL write_ide_register;; IDE LBA_15_8;LOAD sD,s8LOAD sF,LBA_15_8CALL write_ide_register;; IDE LBA_23_16;LOAD sD,s9LOAD sF,LBA_23_16CALL write_ide_register;; IDE LD_LBA_27_24;; LBA_27_42 OR WITH 1110; BIT7 : 1; BIT6 : LBA=1; BIT5 : 1; BIT4 : DRV=0;;LOAD sF,sAOR sF,E0LOAD sD,sFLOAD sF,LD_LBA_27_24CALL write_ide_register;; IDE READ SECTOR COMMAND;LOAD sD,READ_SECTOR_COMMANDLOAD sF,COMMANDCALL write_ide_register;; PUT SECTOR ALLOWED FLAG INTO MY_STATUS;; 290103 Added data available checkretry_status_check:CALL cf_status_checkLOAD sF,s5AND sF,ERROR_MY_STATUSRETURN NZLOAD sF,DATA_TRANSFER_ALLOWEDAND sF,s5; LOOPS UNTIL SECTOR DATA IS AVAILABLEJUMP Z,retry_status_checkLOAD sF,SECTOR_AVAILABLEOR s5,sF;; RESET WORDS READED REGISTER;LOAD s6,FFRETURNread_word_from_cf:;; CHECK IF THE SECTOR IS AVAILABLE;LOAD sF,SECTOR_AVAILABLEAND sF,s5;; IF SECTOR_AVAILABLE=0 JUMP TO READ_NEW_SECTOR;CALL Z,read_new_sector; check for errorLOAD sF,s5AND sF,ERROR_MY_STATUSRETURN NZ;retry_status_check:;CALL cf_status_check;; CHECK IF DATA IS AVAILABLE;; 120103 - changed . When there is sector; available in the cf ram buffer it is not; necessary to check neither bsy or drq; only read words with the correct timing paramenters;;LOAD sF,DATA_TRANSFER_ALLOWED;AND sF,s5; LOOPS UNTIL SECTOR DATA IS AVAILABLE;JUMP Z,retry_status_check; end 120103CALL read_word;; IF 256 WORD READED -> SECTOR AVAILABLE=0;AND s6,s6JUMP Z,reset_word_readed;; DECREMENT NUMBER OF WORDS READED;;SUB s6,01RETURNreset_word_readed:;; IF 256 WORD READED -> SECTOR AVAILABLE=0;;ADD s7,01LOAD s6,FFLOAD sF,FEAND s5,sFRETURN;read_word:;; READ WORDS FROM IDE DATA REGISTERS;LOAD sF,DATACALL read_ide_register;; DATA ARE IN sB , sC;; DATA AVAILABLE SIGNAL IS STOREDLOAD sF,TAG0_WORD_AVAILABLEOUTPUT sF,CONTROL_WB_OUTSUB s6,01RETURNdummy_word_read:CALL read_wordread_new_sector:CALL cf_status_checkLOAD sF,s5AND sF,DATA_TRANSFER_ALLOWED;loops until previous non readed words are readedJUMP NZ,dummy_word_readLOAD sF,s5AND sF,ERROR_MY_STATUSRETURN NZLOAD sF,s5AND sF,COMMAND_ALLOWED; loops until commands are allowedLOAD s6,FFJUMP Z,read_new_sectorJUMP read_sectorcf_status_check:;; CF STATUS REGISTER READ;LOAD sF,STATUSCALL read_ide_register;; ERROR;; BSY/DRDY/DWF/DSC/DRQ/CORR/0/ERR; MASK 0 0 0 0 0 0 0 1; ERR-ST X X X X X X X 1; AND 0 0 0 0 0 0 0 1LOAD sF,01AND sF,sBJUMP NZ,put_error_code;; DATA REQUEST MASK (READY=1 : BUSY=0 : DRQ=1);; BSY/DRDY/DWF/DSC/DRQ/CORR/0/ERR; MASK 1 1 0 0 1 0 0 1; DRQ-ST 0 1 X X 1 X X 0; AND 0 1 0 0 1 0 0 0LOAD sF,C9AND sF,sBSUB sF,48JUMP Z,put_data_request_allowed;;; COMMAND ALLOWED MASK (READY=1 : BUSY=0);; BSY/DRDY/DWF/DSC/DRQ/CORR/0/ERR; MASK 1 1 0 0 0 0 0 1; CMD-ST 0 1 X X 0 X X 0; AND 0 1 0 0 0 0 0 0LOAD sF,C1AND sF,sBSUB sF,40JUMP Z,put_command_allowed;; ELSE DATA_TRANSFER_ALLOWED & COMMAND_ALLOWED => 0;;JUMP put_error_code; REVISAR ???;AND s5,01RETURNput_error_code:;; ERROR SIGNAL;; PUT ERROR CODE;LOAD sF,04OUTPUT sF,CONTROL_OUTCALL soft_resetLOAD s5,ERROR_MY_STATUSRETURN;JUMP inicialization (STACK OVERFLOW???)soft_reset:LOAD sD,SOFT_RESETLOAD sF,CONTROLCALL write_ide_registerLOAD sF,FFCALL wait_loopLOAD sF,FFCALL wait_loopLOAD sF,FFCALL wait_loopLOAD sF,FFCALL wait_loopLOAD sD,00LOAD sF,CONTROLCALL write_ide_registerRETURNput_data_request_allowed:;; DRQ ALLOW -> MY STATUS REGISTER;AND s5,FDLOAD sF,DATA_TRANSFER_ALLOWEDOR s5,sFRETURNput_command_allowed:;; DRQ ALLOW -> MY STATUS REGISTER;AND s5,FBLOAD sF,COMMAND_ALLOWEDOR s5,sFRETURNADDRESS FFinterrupt:RETURNI ENABLE