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參數資料
型號: W88227QD
廠商: WINBOND ELECTRONICS CORP
元件分類: 消費家電
英文描述: ATAPI CD-ROM Decoder(支持ATAPI標準的CD-ROM解碼器)
中文描述: SPECIALTY CONSUMER CIRCUIT, PQFP128
封裝: LQFP-128
文件頁數: 56/116頁
文件大小: 787K
代理商: W88227QD
Preliminary/Confidential
Subject to change without notice
W88227F/W88227QD
- 52 -
1999/10/1 Rev: 0.70
Bit 3:
CPFT - Clear Packet FIFO Trigger
Setting this bit high clears the Packet FIFO.
Bit 2:
ADTT - Automatic Data Transfer Trigger
If
PIO (1Fh.2)
is high, setting ADTT high triggers the following PIO Data Transfer sequence:
Set BSY
DTEN (01h.w2)
1
SCoD (20h.2)
0 if
DINB (1Fh.1)
is 0; otherwise, 1
ATINT (32h)
02h if
DINB (1Fh.1)
is 0; otherwise, 00h
If
STWCEN (18h.w3)
is enabled, then ATBHI/LO
(TWCH/L + 1)
×
2
The data transfer logic will start to fill the Data FIFO automatically. The following sequence will be
executed when
DFRDYb (01h.r1)
become active-low:
DRQ (37h.3)
1
Clear BSY
HIRQ (2Eh.3)
1
After detecting the interrupt, the host will check the status and then read the data.
STWCEN (18h.3)
should not be used for Automatic Multiple Block Transfer. Instead, ATBLO,
ATBHI should be set by firmware to:
(MBC + 1)
×
((TWC + 1)
×
2)
If
PIO (1Fh.2)
is low, setting ADRTG high triggers the following DMA Data Read sequence:
Set BSY
DTEN (01h.w1)
1
SCoD (20h.2)
0 if
DINB (1Fh.1)
is 0; otherwise, 1
ATINT (32h)
02h if
DINB (1Fh.1)
is 0; otherwise, 00h
DRQT - DRQ Trigger
Bit 1:
If bit PIO (1Fh.2) is high, setting this bit high triggers the following hardware sequence:
DRQ (37h.3)
1
BSY
0
HIRQ (2Eh.3)
1
When bit PIO is low (DMA mode), this bit should not be triggered.
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