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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: 71/116頁
文件大小: 787K
代理商: W88227QD
Preliminary/Confidential
Subject to change without notice
W88227F/W88227QD
- 67 -
1999/10/1 Rev: 0.70
MISS1 - Miscellaneous Status Register 0 - (read 2Fh)
Bit 7:
SRST - Soft Reset Flag
This bit becomes high when host writes 1 to bit SRST in the ATAPI Device Control Register if either
master or slave drive is selected. When SRST becomes high, the following events will be executed:
BSY (37h.7)
1
Initialize ATAPI signature
PDIAGEN (20h.w6)
0 and disables
pin NPDIAG (43)
to high-impedance state
Disable
pin NDASP (37)
to high-impedance state if
DASPSS (3Fh.0)
is low. Negates
pin NDASP
(37) if
DASPSS (3Fh.0)
is high.
CKSTP (19h.7)
0
Activates host interrupt to the microprocessor if
HIIEN (2Eh.w7)
is high.
HIRQ (2Eh.w3)
0
Host interrupt is cleared by read register ATCMD (37h) or write
CLRBSY (20h.4)
. SRST is de-
activated by read register
MISS1 (2Fh,r)
after SRST is set to low by host.
ATAC - ATAPI Command
Bit 6:
If the drive is selected, this bit becomes high when any command is written to the ATAPI Command
register except the following opcode are received.
opcode is 90h
opcode is 08h and either
ARST1 (2Fh.w3)
or
ARSTIEN (2Fh.w1)
is enabled
opcode is A0h and
APKTEN (18h.w7)
is high
ATAC is de-activated by the following:
Master reset
Reading register ATCMD (37h)
Writing 1 to
CLRBSY (20h.4)
DIAG - Execute Drive Diagnostics Command
Bit 5:
This bit becomes high if Execute Drive Diagnostics Command (opcode 90h) has been written to either
master or slave drive. Meanwhile, the following events will be executed:
BSY(37h.7)
1
PDIAGEN (20h.w6)
0 and disables pin NPDIAG to high-impedance state
CKSTP (19h.7)
0
ATAPI Error Register
01h
ATAPI Feature Register
00h
ATAPI Interrupt Reason Register
01h
ATAPI SAM Tag Byte
01h
ATAPI Byte Counter Register Low/High
00h
ATAPI Drive Select Register
00h
Clear ATAPI Status Register except bit BSY and SERVICE
Activates host interrupt to the microprocessor if
HIIEN (2Eh.w7)
is enabled
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