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KCPSM Assembler log file for program 'fat16rd.psm'.Generated by KCPSM version 1.10Ken Chapman (Xilinx Ltd) 2002.Addr Code00 ; FAT16 READER V.050303 - Armando Astarloa - 16 BIT VER.00 ; APERT - UPV/EHU 2003 - DISTRIBUTED UNDER GPL LICENCE00 ;00 ; s0 -> TMP0 s1 -> TMP1 s2 -> TMP2 s3 -> TMP3 s4 -> TMP4 / SECTORS_PER_CLUSTER_READED s5 -> TMP5/SECTOR_WORDS_READED (256 TO 0)00 ; s6 -> TMP s7 -> SECTORS_PER_CLUSTER s8 -> CLUSTER_BEGIN_LBA0 (FAT) s9 -> CLUSTER_BEGIN_LBA1 sA -> CLUSTER_BEGIN_LBA200 ; sB -> CLUSTER_BEGIN_LBA3 sC -> ROOT_DIRECTORY_FIRST_CLUSTER0 (SUPPOSED LESS THAN 256 - USUALLY 2)00 ; sD -> data[7:0] WB MASTER sE -> data[15:8] WB MASTER sF -> acummulator00 CONSTANT DATA_WB_OUT_7_0_MASTER, 0000 CONSTANT DATA_WB_OUT_15_8_MASTER, 0100 CONSTANT CONTROL_WB_OUT_MASTER, 0200 ; D7 = D6 = D5 = D4 = D3 = D2 = A0_MASTER D1 = W_WE_MASTER D0 = STB_O_MASTER00 ; STROBE_O_MASTER = 1 & W_WE=0 & WB_A0 = 000 CONSTANT READ_SLAVE, 0100 ; STROBE_O_MASTER = 1 & W_WE=1 & WB_A0 = 000 CONSTANT WRITE_LBA_15_0, 0300 ; STROBE_CF_READER = 1 & W_WE=1 & WB_A0 = 100 CONSTANT WRITE_LBA_27_16, 0700 ;--00 ;-- SLAVE INTERFACE00 ;--00 CONSTANT DATA_WB_OUT_7_0_SLAVE, 0300 CONSTANT DATA_WB_OUT_15_8_SLAVE, 0400 CONSTANT CONTROL_WB_OUT_SLAVE, 0500 ; D7 = D6 = D5 D4 = D3 =00 ; D2 = TAG1_ERROR00 ; D1 = TAG0_WORD_AVAILABLE00 ; D0 = ACK_O_SLAVE00 CONSTANT ACK_O_SLAVE, 0100 CONSTANT TAG0_WORD_AVAILABLE, 0200 CONSTANT ERROR, 0400 ;--00 ;-- BUS CONTROL SIGNALS00 ;--00 CONSTANT CONTROL_OUT_MASTER, 0600 ; D7 = D6 = D5 = D4 = D3 = D2 = D1 =00 ; D0 = WB_BUS_MASTER_WRITE_ENABLE00 CONSTANT WB_BUS_MASTER_WRITE_ENABLE, 0100 CONSTANT CONTROL_OUT_SLAVE, 0700 ; D7 = D6 = D5 = D4 = D3 = D2 = D1 =00 ; D0 = WB_BUS_SLAVE_WRITE_ENABLE00 CONSTANT WB_BUS_SLAVE_WRITE_ENABLE, 0100 ;--00 ;-- EXTERNAL REGISTERS FOR MORE DATA ALLOCATION (OTHER OPTION IS THE USE OF00 ;-- ANOTHER BLOCK RAM IF IT IS AVALIABLE00 ;--00 CONSTANT TMP_OUT_0, 0800 CONSTANT TMP_OUT_1, 0900 CONSTANT TMP_OUT_2, 0A00 CONSTANT TMP_OUT_3, 0B00 CONSTANT TMP_OUT_4, 0C00 CONSTANT TMP_OUT_5, 0D00 CONSTANT TMP_OUT_6, 0E00 CONSTANT TMP_OUT_7, 0F00 ;--00 ;-- INPUT PORTS00 ;--00 ;--00 ;-- WISHBONE INTERFACE PORTS - INPUTS00 ;--00 CONSTANT CONTROL_WB_IN_MASTER, 0000 ; D7 = D6 = D5 = D4 = D3 = D2 =00 ; D1 = ERROR_INPUT00 ; D0 = ACK_I_MASTER00 ;00 CONSTANT ACK_I_MASTER, 0100 CONSTANT ERROR_INPUT, 0200 CONSTANT CONTROL_WB_IN_SLAVE, 0100 ; D7 = D6 = D5 = D4 = D3 = D2 =00 ; D1 = -00 ; D0 = STB_I_SLAVE00 ;00 CONSTANT STB_I_SLAVE, 0100 ;CONSTANT TAG0_FORCE_RESET,0200 ;--00 ;-- WISHBONE INTERFACE PORTS - INPUTS00 ;--00 CONSTANT DATA_WB_IN_7_0_MASTER, 0200 CONSTANT DATA_WB_IN_15_8_MASTER, 0300 ;--00 ;-- EXTERNAL REGISTERS FOR MORE DATA ALLOCATION (OTHER OPTION IS THE USE OF00 ;-- ANOTHER BLOCK RAM IF IT IS AVALIABLE00 ;--00 CONSTANT TMP_IN_0, 0400 CONSTANT TMP_IN_1, 0500 CONSTANT TMP_IN_2, 0600 CONSTANT TMP_IN_3, 0700 CONSTANT TMP_IN_4, 0800 CONSTANT TMP_IN_5, 0900 CONSTANT TMP_IN_6, 0A00 CONSTANT TMP_IN_7, 0B00 ;--00 ;-- REGISTERS INITIALIZATION00 ;--00 inicialization:00 ;00 ; WISHBONE INTERFACES INIZIALIZATION00 ;00 0F00 LOAD sF, 0001 EF00 OUTPUT sF, DATA_WB_OUT_7_0_MASTER[00]02 EF01 OUTPUT sF, DATA_WB_OUT_15_8_MASTER[01]03 EF03 OUTPUT sF, DATA_WB_OUT_7_0_SLAVE[03]04 EF04 OUTPUT sF, DATA_WB_OUT_15_8_SLAVE[04]05 EF02 OUTPUT sF, CONTROL_WB_OUT_MASTER[02]06 EF05 OUTPUT sF, CONTROL_WB_OUT_SLAVE[05]07 ;07 ; WAIT FOR 410NS*3 (RESET DELAY)0707 main:07 ; PROCESS MASTER BOOT RECORD07 8348 CALL process_master_boot_record[48]08 ; PROCESS ROOT DIRECTORY08 838B CALL process_root_directory[8B]09 start:09 83AE CALL cluster_2_lba[AE]0A ;CALL write_lba_to_slave0A ; sector_per_cluster -> sector_per_cluster_readed0A C470 LOAD s4, s70B ; 256 -> (s6) SECTOR_WORDS_READED0B 8345 CALL read_sector[45]0C idle:0C A601 INPUT s6, CONTROL_WB_IN_SLAVE[01]0D ; CHECK STB INPUT0D ; CONTROL_WB_IN_SLAVE-> TMP (s6)0D ; IF STB=1 GO TO THE NEXT STATE0D ; IF STB=0 GO TO THE IDLE STATE0D 1601 AND s6, STB_I_SLAVE[01]0E 910C JUMP Z, idle[0C]0F transfer_word_to_master:0F 83E8 CALL read_word_from_slave[E8]10 83C4 CALL write_a_word_to_master[C4]11 ; (SECTOR WORDS READED)-111 6501 SUB s5, 0112 check_sectors_words_readed:12 ; IF sector_words_readed = 0 THEN READ_NEW_SECTOR12 ; IF sector_words_readed > 0 THEN TRANSFER_WORD_TO_MASTER12 C551 AND s5, s513 933E CALL Z, check_sector_per_cluster_readed[3E]14 810C JUMP idle[0C]15 track_new_cluster:15 ; save the number of dummy reads that must be done when the fat sector will be readed15 ; an are stored into s5 register15 ; in s0 bits 6-0 of the cluster number (offset in the sector -> 256 words-fat16 entries)15 ; as is each read operation a word is readed no multiplication is needed15 ; RESTORE CLUSTER NUMBER15 A008 INPUT s0, TMP_IN_4[08]16 A109 INPUT s1, TMP_IN_5[09]17 A20A INPUT s2, TMP_IN_6[0A]18 A30B INPUT s3, TMP_IN_7[0B]19 ;19 ; compose LBA address of the sector of the fat that must be readed19 ;19 ; SHIFT RIGHT 15-8 TO 7-019 ;19 0F07 LOAD sF, 071A do_shift:1A D30E SR0 s31B ; uses the carry for the MSB and stores LSB into the carry1B D208 SRA s21C D108 SRA s11D D008 SRA s01E 6F01 SUB sF, 011F 951A JUMP NZ, do_shift[1A]20 8335 CALL add_load_fat_begin_lba[35]21 ; adds fat_begin_lba to the sector relative to the fat obteined from the cluster21 ; now there is the lba of the FAT sector that must be readed in s0,s1,s2,s321 83D3 CALL write_lba_to_slave[D3]22 ; -- DUMMY READ OF THE WORDS OF THE SECTOR TILL THE ONE OF THE CLUSTER INTEGER22 AF08 INPUT sF, TMP_IN_4[08]23 1F7F AND sF, 7F24 83E3 CALL do_dummy_reads_from_slave[E3]25 ;25 ; (sD) data[7:0] WB MASTER -> (s0) TEMPORAL REGISTER25 ; (sE) data[7:0] WB MASTER -> (s1) TEMPORAL REGISTER25 ; READ 2 BYTES25 83E8 CALL read_word_from_slave[E8]26 C0D0 LOAD s0, sD27 C1E0 LOAD s1, sE28 ; (sD) data[7:0] WB MASTER -> (s2) TEMPORAL REGISTER28 ; (sE) data[7:0] WB MASTER -> (s3) TEMPORAL REGISTER28 ; READ 2 BYTES28 ;28 ; CHECK IF ITS THE LAST ONE28 ; CB3-CL2-CB1-CB0 IN FAT LITTLE ENDIAN ORDER CB0-CB1 CB2-CB328 CFE0 LOAD sF, sE29 6FFF SUB sF, FF2A 952F JUMP NZ, continue_file_processing[2F]2B CFD0 LOAD sF, sD2C 6FFF SUB sF, FF2D 952F JUMP NZ, continue_file_processing[2F]2E file_end:2E ; infinite loop (file readed and tranferred)2E 812E JUMP file_end[2E]2F continue_file_processing:2F ; in s0,s1 is the cluster name2F ; --2F ; (SECTOR WORDS READED)= 2562F ; sector_per_cluster -> sector_per_cluster_readed2F 0200 LOAD s2, 0030 0300 LOAD s3, 0031 C470 LOAD s4, s732 83AE CALL cluster_2_lba[AE]33 8345 CALL read_sector[45]34 8080 RETURN35 add_load_fat_begin_lba:35 AF04 INPUT sF, TMP_IN_0[04]36 C0F4 ADD s0, sF37 AF05 INPUT sF, TMP_IN_1[05]38 C1F5 ADDCY s1, sF39 AF06 INPUT sF, TMP_IN_2[06]3A C2F5 ADDCY s2, sF3B AF07 INPUT sF, TMP_IN_3[07]3C C3F5 ADDCY s3, sF3D 8080 RETURN3E check_sector_per_cluster_readed:3E ; IF sector_per_cluster_readed = 0 THEN TRACK_NEW_CLUSTER3E ; IF sector_per_cluster_readed > 0 THEN CHECK SECTOR WORDS READED3E ; (sector_per_cluster_readed)-13E ; (SECTOR WORDS READED)= 2563E 6401 SUB s4, 013F C441 AND s4, s440 9115 JUMP Z, track_new_cluster[15]41 read_new_sector:41 ; (SECTOR WORDS READED)= 25641 ; increment LBA41 ; sector_per_cluster -> sector_per_cluster_readed-141 4001 ADD s0, 0142 5100 ADDCY s1, 0043 5200 ADDCY s2, 0044 5300 ADDCY s3, 0045 read_sector:45 0500 LOAD s5, 0046 83D3 CALL write_lba_to_slave[D3]47 8080 RETURN48 ;48 ; --48 ; -- PROCESS MASTER BOOT RECORD (READ LBA BEGIN OF THE FIRST PARTITION)48 ; --48 process_master_boot_record:48 ;48 ; LOAD LBA FOR MBR READ48 ;48 0000 LOAD s0, 0049 0100 LOAD s1, 004A 0200 LOAD s2, 004B 0300 LOAD s3, 004C 83D3 CALL write_lba_to_slave[D3]4D ; information of the lba begin for the first partition4D ; has an offset of 454 bytes -> 227(0xE3) words4D 0FE3 LOAD sF, E34E 83E3 CALL do_dummy_reads_from_slave[E3]4F ;4F ; --4F ; -- MBR READ - Partition_LBA_Begin EXTRACTION4F ; --4F ;4F ; (sD) data[7:0] WB MASTER -> (s0) lba4F ; (sE) data[15:8] WB MASTER -> (s1) lba4F ; (sD) data[7:0] WB MASTER -> (s2) lba4F ; (sE) data[15:8] WB MASTER -> (s3) lba4F 8384 CALL store_all_temporal_registers[84]50 C800 LOAD s8, s051 C910 LOAD s9, s152 CA20 LOAD sA, s253 CB30 LOAD sB, s354 ;54 ; NOW IS THE LBA_BEGIN ON THE TMP REGISTERS54 ; --------------------54 ; READ FIRST SECTOR (FAT32 VOLUMEN ID) OF THE PARTITION54 ; ---------------------54 83D3 CALL write_lba_to_slave[D3]55 ;55 ; READ -> SECTORS_PER_CLUSTER (OFFSET 0x0D)55 ;55 ; offset 0x0D (13) => READ 13 bytes -> 6(0x06) words and drop LSB in the next55 0F06 LOAD sF, 0656 83E3 CALL do_dummy_reads_from_slave[E3]57 ;57 ; (sE) data[7:0] WB MASTER -> (s7) SECTORS PER CLUSTER57 83E8 CALL read_word_from_slave[E8]58 C7E0 LOAD s7, sE59 ;59 ; READ -> Number_of_Reserved_Sectors (2 bytes) (OFFSET 0x0E)59 ;59 ; offset 0x0E (14) => READ 2 bytes -> 1(0x01) words59 ; (sD) data[15:8] WB MASTER -> (s6) TEMPORAL REGISTER59 83E8 CALL read_word_from_slave[E8]5A C6D0 LOAD s6, sD5B ; (sE) data[7:0] WB MASTER -> (s4) TEMPORAL REGISTER5B ;5B C4E0 LOAD s4, sE5C ;5C ;fat_begin_lba = Partition_LBA_Begin + Number_of_Reserved_Sectors5C ;5C C864 ADD s8, s65D C945 ADDCY s9, s45E 5A00 ADDCY sA, 005F 5B00 ADDCY sB, 0060 ; store fat_begin_lba in external registers60 E808 OUTPUT s8, TMP_OUT_0[08]61 E909 OUTPUT s9, TMP_OUT_1[09]62 EA0A OUTPUT sA, TMP_OUT_2[0A]63 EB0B OUTPUT sB, TMP_OUT_3[0B]64 ;64 ;cluster_begin_lba = Partition_LBA_Begin + Number_of_Reserved_Sectors +64 ; (Number_of_FATs * Sectors_Per_FAT)+ RootDirSectors;64 ;cluster_begin_lba = fat_begin_lba + (Number_of_FATs * Sectors_Per_FAT)+ RootDirSectors;64 ; READ -> Number_of_Fats (OFFSET 0x10) (always 2)64 ;64 ; offset 0x10 (16) => READ 2 bytes -> 1(0x01) words64 ;64 ; (sD) data[7:0] WB MASTER -> (s6) TEMPORAL REGISTER64 83E8 CALL read_word_from_slave[E8]65 C6D0 LOAD s6, sD66 ;66 ; FOR FAT16 => NUMBER OF SECTORS OCCUPIED BY THE ROOT DIRECTORY (BYTES_PER_SEC=512)66 ;66 ; READ -> RootEntCnt (OFFSET 0x11) (FAT16 PROCESSING)66 ; RootDirSectors=((BPB_RootEntCnt*32)+(BPB_BytesPerSec-1))/BPB_BytesPerSec66 ; offset 0x11 (17) => READ 1 bytes66 ;66 ; (sE) data[7:0] WB MASTER -> (s0) TEMPORAL REGISTER66 C0E0 LOAD s0, sE67 ; (sD) data[15:0] WB MASTER -> (sD) TEMPORAL REGISTER - offset 0x12 (18) => READ 1 bytes67 83E8 CALL read_word_from_slave[E8]68 C1D0 LOAD s1, sD69 ; MULTIPLY BY 32 (100000) 5 SHIFTS TO THE LEFT69 0F05 LOAD sF, 056A ; LSB '0'6A mult_32:6A D006 SL0 s06B ; CARRY -> LSB , MSB -> CARRY6B D100 SLA s16C 6F01 SUB sF, 016D 956A JUMP NZ, mult_32[6A]6E ;BPB_RootEntCnt*32+(BPB_BytesPerSec-1) 511 (0x1FF)6E ;ADD s0,FF (if rounds up => not necessary??)6E ;ADDCY s1,016E ;/BPB_BytesPerSec (512) (1000000000)9 SHIFTS TO THE RIGHT6E 0F09 LOAD sF, 096F div_512:6F ; uses the carry for the MSB and stores LSB into the carry6F D10E SR0 s170 D008 SRA s071 6F01 SUB sF, 0172 956F JUMP NZ, div_512[6F]73 ; ROUNDs UP73 ;ADD s0,0173 ;ADDCY s1,0073 ;fat_begin_lba + RootDirSectors73 C804 ADD s8, s074 C915 ADDCY s9, s175 CA25 ADDCY sA, s276 CB35 ADDCY sB, s377 ; READ -> Sectors_per_fat (OFFSET 0x24)77 ;77 ; offset 0x16 (22) => READ 2 bytes -> 01(0x01) words77 ;77 0F01 LOAD sF, 0178 83E3 CALL do_dummy_reads_from_slave[E3]79 8384 CALL store_all_temporal_registers[84]7A ; (Number_of_FATs * Sectors_Per_FAT)7A ; Number_of_FATs = 2 (10) . Do a shift to the left of the Sectors_Per_Fat7A ; *** FAT16 = Sectors_per_fat(BPB_FATSz16)7A ; LSB '0'7A D006 SL0 s07B ; CARRY -> LSB , MSB -> CARRY7B D100 SLA s17C ;SLA s2 for fat16 only 2 bytes7C ;SLA s37C ; fat_begin_lba + RootDirSectors + (Number_of_FATs * Sectors_Per_FAT)7C C804 ADD s8, s07D C915 ADDCY s9, s17E 5A00 ADDCY sA, 007F 5B00 ADDCY sB, 0080 ; cluster_begin_lba is stored in s8, s9, sA, SB80 ;80 ; FOR FAT16 ROOT DIRECTORY POSITION IS FIXED80 ; root_first_lba = fat_begin_lba(in external regs) + (Number_of_FATs * Sectors_Per_FAT) (s0,s1,s2,s3)80 ;80 0200 LOAD s2, 0081 0300 LOAD s3, 0082 8335 CALL add_load_fat_begin_lba[35]83 ; s0,s1,s2,s3 have Root directory begin lba83 8080 RETURN84 store_all_temporal_registers:84 ; READ 2 BYTES84 83E8 CALL read_word_from_slave[E8]85 ; (sD) data[7:0] WB MASTER -> (s0) TEMPORAL REGISTER85 ; (sE) data[7:0] WB MASTER -> (s1) TEMPORAL REGISTER85 C0D0 LOAD s0, sD86 C1E0 LOAD s1, sE87 ; (sD) data[7:0] WB MASTER -> (s2) TEMPORAL REGISTER87 ; (sE) data[7:0] WB MASTER -> (s3) TEMPORAL REGISTER87 ; READ 2 BYTES87 83E8 CALL read_word_from_slave[E8]88 C2D0 LOAD s2, sD89 C3E0 LOAD s3, sE8A 8080 RETURN8B process_root_directory:8B ; INPUT :8B ; s0,s1,s2,s3 root directory lba (FAT16- FIXED)8B ; CALL cluster_2_lba8B ; now s0,s1,s2,s3 contains the lba for the root directory8B ; the first 32 byte record on the sector must be the root directory information8B ; check if EOF (first byte of the 32 bytes is 0)8B 83D3 CALL write_lba_to_slave[D3]8C check_for_a_file:8C 83E8 CALL read_word_from_slave[E8]8D ; (sD) data[7:0] WB MASTER -> (s6) TEMPORAL REGISTER8D C6D0 LOAD s6, sD8E CF60 LOAD sF, s68F CFF1 AND sF, sF90 ; if sF=0 the is not directory => error90 91F2 JUMP Z, put_error_code[F2]91 ;91 ; check that is not a deleted entry91 ;91 ; (sD) data[7:0] WB MASTER -> (s6) TEMPORAL REGISTER91 0FE5 LOAD sF, E592 CF61 AND sF, s693 ; if s6=E5 is a deteled entry => check for new one (offset => sF)93 919D JUMP Z, check_next_directory_entry[9D]94 check_attribute:94 ; ATTRIBUTE -> OFFSET Bh94 ; check that is not a directory or LONG NAME94 ; 00arshdv - DV for long name - D for directory94 ; (sD) data[7:0] WB MASTER -> (s6) TEMPORAL REGISTER94 0F04 LOAD sF, 0495 83E3 CALL do_dummy_reads_from_slave[E3]96 83E8 CALL read_word_from_slave[E8]97 C6E0 LOAD s6, sE98 0F03 LOAD sF, 0399 CF61 AND sF, s69A 959F JUMP NZ, check_next_directory_entry_attribute[9F]9B ; if s6=0 that is not a file => error9B ;JUMP Z,check_next_directory_entry9B ; check that is not a directory9B ; check that is a file (short filename entry)9B ; in other case error9B ;9B ;9B ; READ CLUSTER INFORMATION FOR THE FILE9B ;9B 83A2 CALL read_dir_cluster_hi_cluster_low[A2]9C 8080 RETURN9D check_next_directory_entry:9D ; go fwd 11 words9D 0F05 LOAD sF, 059E 83E3 CALL do_dummy_reads_from_slave[E3]9F check_next_directory_entry_attribute:9F ; go fwd 5 words9F 0F0A LOAD sF, 0AA0 83E3 CALL do_dummy_reads_from_slave[E3]A1 818C JUMP check_for_a_file[8C]A2 read_dir_cluster_hi_cluster_low:A2 ; INPUT :A2 ; before arrive here first two bytes of the directoryA2 ; structure must be readedA2 ; OUTPUT :A2 ; s0,s1 : CLUS_LOWA2 ; s2,s3 : CLUS_HIA2 ;A2 ; READ -> cluster_HI (OFFSET 0x14)A2 ;A2 ; offset 0x14 (20) => READ 18 bytes -> 9(0x09) wordsA2 ;A2 0F04 LOAD sF, 04A3 83E3 CALL do_dummy_reads_from_slave[E3]A4 ; (sD) data[7:0] WB MASTER -> s2A4 ; (sE) data[7:0] WB MASTER -> s3A4 ; READ 2 BYTESA4 83E8 CALL read_word_from_slave[E8]A5 C2D0 LOAD s2, sDA6 C3E0 LOAD s3, sEA7 EE0F OUTPUT sE, TMP_OUT_7[0F]A8 ;A8 ; READ -> cluster_low(OFFSET 0x1A)A8 ;A8 ; offset 0x1A (26) => READ 4 bytes -> 2(0x02) wordsA8 ;A8 0F02 LOAD sF, 02A9 83E3 CALL do_dummy_reads_from_slave[E3]AA ; (sD) data[7:0] WB MASTER -> s0AA ; (sE) data[7:0] WB MASTER -> s1AA ; READ 2 BYTESAA 83E8 CALL read_word_from_slave[E8]AB C0D0 LOAD s0, sDAC C1E0 LOAD s1, sEAD ; s0,s1 clus_low s3,s4 - clus_highAD 8080 RETURNAE ; -- MBR READ OPERATION - LBA BEGIN DETERMINATIONAE ; '00' -> LBA_7_0,LBA_15_8,LBA_23_16,LD_LBA_27_24AE cluster_2_lba:AE ; --AE ; -- LBA ADDRESS DETERMINATIONAE ; --AE ; lba_addr = cluster_begin_lba + (cluster_number - 2) * sectors_per_cluster;AE ;AE ; INPUT :AE ; s0 : CLUSTER_NUMBER0, s1 : CLUSTER_NUMBER1, s2: CLUSTER_NUMBER2, s3 : CLUSTER_NUMBER3AE ; OUTPUT :AE ; s0 : LBA_ADDR_7_0 TMP1, s1 : LBA_ADDR_15_8, s2 : LBA_ADDR_24_16, s3 : LBA_ADDR_27_24AE ;AE ; cluster_number - 2AE ;AE E00C OUTPUT s0, TMP_OUT_4[0C]AF E10D OUTPUT s1, TMP_OUT_5[0D]B0 E20E OUTPUT s2, TMP_OUT_6[0E]B1 E30F OUTPUT s3, TMP_OUT_7[0F]B2 6002 SUB s0, 02B3 7100 SUBCY s1, 00B4 7200 SUBCY s2, 00B5 7300 SUBCY s3, 00B6 ;B6 ; (cluster_number - 2) * sectors_per_cluster(s7);B6 ;B6 ; to perform the multiplication as sector_per_cluster is 2 multiple must be knownB6 ; who many times must be shiftedB6 ; (use sD as temporal register)B6 0F08 LOAD sF, 08B7 CD70 LOAD sD, s7B8 multiply:B8 DD0E SR0 sDB9 ; loop until detection of the 1 (2 multiple) - Add timeout!!!B9 99BF JUMP C, add_cluster_begin_lba[BF]BA ; LSB '0'BA D006 SL0 s0BB ; CARRY -> LSB , MSB -> CARRYBB D100 SLA s1BC D200 SLA s2BD D300 SLA s3BE 81B8 JUMP multiply[B8]BF add_cluster_begin_lba:BF ; lba_addr (TMP0,TMP1,TMP2,TMP3)= cluster_begin_lba + (cluster_number - 2) * sectors_per_cluster;BF C084 ADD s0, s8C0 C195 ADDCY s1, s9C1 C2A5 ADDCY s2, sAC2 C3B5 ADDCY s3, sBC3 8080 RETURNC4 ; --C4 ; -- WRITE A WORD INTO THE WB SLAVE INTERFACE (TO THE MASTER)C4 ; --C4 ; INPUTS :C4 ; TMP0 : LSB TO DATA_WB_OUT_7_0_SLAVEC4 ; TMP1 : MSB TO DATA_WB_OUT_15_8_SLAVEC4 ;C4 write_a_word_to_master:C4 ; TMP0 => DATA_WB_OUT_7_0_SLAVEC4 ED03 OUTPUT sD, DATA_WB_OUT_7_0_SLAVE[03]C5 ; 00 => DATA_WB_OUT_15_8_SLAVEC5 ;LOAD sF,00 -- 8 BIT VERSIONC5 ;OUTPUT sF,DATA_WB_OUT_15_8_SLAVE -- 8 BIT VERSIONC5 EE04 OUTPUT sE, DATA_WB_OUT_15_8_SLAVE[04]C6 83CB CALL write_a_byte_to_master[CB]C7 ;C7 ; CHECK STB INPUT | CONTROL_WB_IN_SLAVE-> TMP (s6)C7 ;C7 wait_strobe:C7 A601 INPUT s6, CONTROL_WB_IN_SLAVE[01]C8 ;C8 ;C8 1601 AND s6, STB_I_SLAVE[01]C9 91C7 JUMP Z, wait_strobe[C7]CA ; TMP1 => DATA_WB_OUT_7_0_SLAVECA ; OUTPUT sE,DATA_WB_OUT_7_0_SLAVECA ; 00 =>DATA_WB_OUT_15_8_SLAVECA ;LOAD sF,00 -- 8 BIT VERSIONCA ;OUTPUT sF,DATA_WB_OUT_15_8_SLAVE -- 8 BIT VERSIONCA ;CALL write_a_byte_to_master -- 8 BIT VERSIONCA 8080 RETURNCB write_a_byte_to_master:CB ;CB ; WB SLAVE WRITE ENABLE ACTIVECB ;CB 0F01 LOAD sF, WB_BUS_SLAVE_WRITE_ENABLE[01]CC EF07 OUTPUT sF, CONTROL_OUT_SLAVE[07]CD ;CD ; ACK TO THE MASTER UNTIL STB FINISHCD ;CD ack_to_the_master:CD 0F01 LOAD sF, ACK_O_SLAVE[01]CE EF05 OUTPUT sF, CONTROL_WB_OUT_SLAVE[05]CF ;CF ;CF 0F00 LOAD sF, 00D0 EF07 OUTPUT sF, CONTROL_OUT_SLAVE[07]D1 EF05 OUTPUT sF, CONTROL_WB_OUT_SLAVE[05]D2 8080 RETURND3 ; --D3 ; -- WRITE A LBA INTO THE WB MASTER INTERFACE (TO THE SLAVE)D3 ; --D3 ; INPUTS :D3 ; TMP0 : LBA_ADDR_7_0, TMP1 : LBA_ADDR_15_8, TMP2 : LBA_ADDR_24_16, TMP3 : LBA_ADDR_27_24D3 ;D3 ;D3 write_lba_to_slave:D3 ;D3 ; WB MASTER WRITE ENABLE ACTIVED3 ;D3 0F01 LOAD sF, WB_BUS_MASTER_WRITE_ENABLE[01]D4 EF06 OUTPUT sF, CONTROL_OUT_MASTER[06]D5D5 ;write_lba_15_0_to_slave:D5 ;D5 ; TMP0 : LBA_ADDR_7_0 (s0) => DATA_WB_OUT_7_0_MASTERD5 ; TMP1 : LBA_ADDR_15_8 (s1) => DATA_WB_OUT_15_8_MASTERD5 ;D5 E000 OUTPUT s0, DATA_WB_OUT_7_0_MASTER[00]D6 E101 OUTPUT s1, DATA_WB_OUT_15_8_MASTER[01]D7 ;D7 ; --D7 ; -- WRITE LBA 15-0 TO THE SLAVED7 ; --D7 ;D7 ; WB_CONTROL_OUT_MASTERD7 ; W_WE_MASTER = 1D7 ; STB_O_MASTER = 1D7 ; A0 = 0D7 ;D7 0F03 LOAD sF, WRITE_LBA_15_0[03]D8 EF02 OUTPUT sF, CONTROL_WB_OUT_MASTER[02]D9 ;D9 ; WAIT FOR THE ACKD9 ;D9 83EA CALL wait_for_the_ack[EA]DA ;write_lba_27_16_to_slave:DA ;DA ; TMP2 : LBA_ADDR_23_16 (s2) => DATA_WB_OUT_7_0_MASTERDA ; TMP3 : LBA_ADDR_27_24 (s3) => DATA_WB_OUT_15_8_MASTERDA ;DA E200 OUTPUT s2, DATA_WB_OUT_7_0_MASTER[00]DB E301 OUTPUT s3, DATA_WB_OUT_15_8_MASTER[01]DCDC ; --DC ; -- WRITE LBA 27-16 TO THE SLAVEDC ; --DC ; WB_CONTROL_OUT_MASTERDC ; W_WE_MASTER = 1DC ; STB_O_MASTER = 1DC ; A0 = 0DC ;DC 0F07 LOAD sF, WRITE_LBA_27_16[07]DD EF02 OUTPUT sF, CONTROL_WB_OUT_MASTER[02]DE ;DE ; WAIT FOR THE ACKDE ;DE 83EA CALL wait_for_the_ack[EA]DF ; --DF ; -- FINISH WRITE OPERATION ON THE MASTER WB INTERFACEDF ; --DF ;DF ; WB_CONTROL_OUT_MASTERDF ; W_WE_MASTER = 0DF ; STB_O_MASTER = 0DF ; A0 = 0DF ;DF 0F00 LOAD sF, 00E0 EF02 OUTPUT sF, CONTROL_WB_OUT_MASTER[02]E1 EF06 OUTPUT sF, CONTROL_OUT_MASTER[06]E2 8080 RETURNE3 ; --E3 ; -- PERFORM DUMMY READS FROM THE WB SLAVEE3 ; --E3 ; -- IN sF ARE THE NUMBER OF WORDS THAT MUST BE READEDE3 ; --E3 do_dummy_reads_from_slave:E3 C6F0 LOAD s6, sFE4 dummy_reads_from_slave:E4 83E8 CALL read_word_from_slave[E8]E5 6601 SUB s6, 01E6 95E4 JUMP NZ, dummy_reads_from_slave[E4]E7 8080 RETURNE8E8 ; --E8 ; -- PERFORM A WORD READING FROM THE WB SLAVEE8 ; --E8 read_word_from_slave:E8 ; WB_CONTROL_OUT_MASTERE8 ; W_WE_MASTER = 0E8 ; STB_O_MASTER = 1E8 ; A0 = 0E8 ; wait stateE8 0F01 LOAD sF, READ_SLAVE[01]E9 EF02 OUTPUT sF, CONTROL_WB_OUT_MASTER[02]EA ;EA ; WAIT FOR THE ACKEA ;EA ; CALL wait_for_the_ackEA ;JUMP Z,data_available_on_wb_masterEA wait_for_the_ack:EA ;EA ; CONTROL_WB_IN_MASTER -> TMP (s6)EA ;EA AF00 INPUT sF, CONTROL_WB_IN_MASTER[00]EB ;EB 1F01 AND sF, ACK_I_MASTER[01]EC 91EA JUMP Z, wait_for_the_ack[EA]ED data_available_on_wb_master:ED ; This part is not necessary in write operationsED ; DATA_WB_IN_7_0_MASTER -> (sD) data[7:0] WB MASTERED ; DATA_WB_IN_15_8_MASTER -> (sE) data[15:8] WB MASTERED AD02 INPUT sD, DATA_WB_IN_7_0_MASTER[02]EE AE03 INPUT sE, DATA_WB_IN_15_8_MASTER[03]EF ; DISABLE RD/WR OPERATION REQUESTEF 0F00 LOAD sF, 00F0 EF02 OUTPUT sF, CONTROL_WB_OUT_MASTER[02]F1 8080 RETURNF2 put_error_code:F2 0F04 LOAD sF, ERROR[04]F3 EF05 OUTPUT sF, CONTROL_WB_OUT_SLAVE[05]F4 81F2 JUMP put_error_code[F2]F5 interrupt:F5 80F0 RETURNI ENABLE
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