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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: 28/116頁
文件大小: 787K
代理商: W88227QD
Preliminary/Confidential
Subject to change without notice
W88227F/W88227QD
- 24 -
1999/10/1 Rev: 0.70
2.2.3.4 BSY flag control
BSY is bit-7 of ATAPI Status Register.
BSY set
BSY clear
Chip reset
Set
CLRBSY (20h.w4)
if
APKT (30h.r0)
is low
Host reset
Set
DRQT (17h.w1)
if
PIO (1Fh.2
) is high
Set bit
SRST
in ATAPT Device Control Register
Host issue ATAPI Command (opcode A0h) if
APKTEN (18h.7)
is high
Set
SETBSY (20h.w3)
if
APKT (30h.r0)
is low
Automatic Status Completion sequence, enabled by
SCT (17h.w0)
or
ASCEN (18h.5)
Host issues Execute Diagnostics Command
(opcode 90h)
DFRDYb (01h.r1)
becomes low after
ADTT
(17h.w2)
is set, if
PIO (1Fh.2
) is high
Host issue ATA Command when drive is
selected
Transfer end if
ADCEN (18h.6)
is enabled
Set
ADTT (17h.w2)
Set
DSCT (17h.w5)
if
ABYEN (18h.1)
is enabled -
lasting 3 system clocks
2.2.3.5 Pin HIRQ control
Pin HIRQ
is set or clear by the following conditions if the drive is selected and
nIEN
is enabled in the ATAPI
Device Control Register.
HIRQ is activated by the following events:
Automatic Packet Transfer sequence, enabled by
APKTEN (18h.7)
Automatic Status Completion sequence, enabled by
SCT (17h.w0)
or
ASCEN (18h.5)
Write
MISC0 (2Eh)
with bit-3 high
HIRQ is de-activated by the following events:
Chip reset or host reset or firmware rest
Set bit SRST in the ATAPI Device Control Register high
Host issue ATA command while the drive is selected
Host read ATAPI Status Register while the drive is selected
Write
MISC0 (2Eh)
with bit-3 low
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