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參數資料
型號: W88113C
廠商: WINBOND ELECTRONICS CORP
英文描述: ATAPI CD-ROM DECODER & CONTROLLER
中文描述: ATAPI的CD - ROM解碼器
文件頁數: 88/102頁
文件大小: 573K
代理商: W88113C
W88113C
Publication Release Date: Mar. 1999
- 84 - Revision 0.61
of registers
TWCH/L (03h/02h)
should be set 4 instead of 5. Then firmware should repeatedly read
register
PFAR (00h,r)
after Transfer End Interrupt asserts until flag
PFNEb (01h.r7)
becomes one.
<example> data-out transfer sequence:
1. TENDEN (01h.w6)
1
2. ASCTRL (18h,w)
58h
3. HICTL0 (1Fh.w)
0Bh
4. TWC (03h/02h,w)
min(0004h, byte_cnt/2-1)
5. ADTT (17h.w2)
1
6. wait TENDb (01h.r6) = 0 and TDIR (30h.r5) = 1 and FPKT (30h.r1) = 1
7. TACK (07h,w)
FFh
8. read PFAR (00h,r); byte_cnt =byte_cnt - 1
9. if PFNEb (01h.r7) is low, repeat step (8)
10. f (byte_cnt
0) goto step (4)
11. SCT (17h.0)
1
// UDMA data-out
// automatic data transfer trigger
// status complete trigger
5.3.3 Ultra DMA Error Handling
Flag
UCRCOKb (30h.r3)
is used to determine if a CRC error event has occurred during latest Ultra
DMA burst. If
AUCRCEN (18h.2)
and
ASCEN (18h.5)
are both set high, the automatic status
complete logic would not be triggered if
UCRCOKb (30h.r3)
is high. Therefore, firmware should
check
UCRCOKb (30h.r3)
flag after each Ultra DMA burst. If a CRC error has occurred, firmware
should set
CHK (37h.0)
to one and manually trigger status complete.
5.3.4 Ultra DMA Data-In Transfer Diagram
DMARQ(53)
DMACKb(48)
HRDb(50)
HWRb(52)
IORDY(49)
DFRDYb(01h.1)
Data transfer trigger
TENDb(01h.6)
commdnad
FIFO prefetch
Tcyc
UDMA Burst
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