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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: 90/102頁
文件大小: 573K
代理商: W88113C
W88113C
Publication Release Date: Mar. 1999
- 86 - Revision 0.61
5.3.6 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
5.3.7 Pin HIRQ control
Pin HIRQ (47)
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:
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:
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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