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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: 72/116頁
文件大小: 787K
代理商: W88227QD
Preliminary/Confidential
Subject to change without notice
W88227F/W88227QD
- 68 -
1999/10/1 Rev: 0.70
Bit 4:
SHDC - Shadow Command Flag
This bit becomes high when the host writes a command to a non-existent slave drive. Meanwhile,
Decoder interrupt
becomes low-active if
SHIEN (2Eh.w2)
is enabled. ATAC is de-activated by the
following:
Master reset
Reading register ATCMD (37h)
Writing 1 to
CLRBSY (20h.4)
ARST - ATAPI Soft Reset Flag
Bit 3:
This bit becomes high when DEVICE RESET Command (opcode 08h) is written to either master or
slave drive. ARST is de-activated by writing any value to register
ARSTACK (30h,w).
RST - Reset Flag
Bit 2:
This bit is high when the chip is currently being reset by chip reset, host reset, or firmware reset.
Bit 1:
FRST - Firmware Reset Flag
This bit is high if the current or most recent reset was firmware reset. The first read of register
MISS1
(2Fh,r)
following the end of the firmware reset clears this flag to 0.
MRST - Master reset Flag
Bit 0:
This bit is high if the current or most recent reset was activated by master reset. The BSY flag is set
whenever master reset is activated. The first read of register
MISS1 (2Fh,r)
following the end of the
master reset clears this flag to 0.
ARSTACK - ATAPI Soft Reset Acknowledge (write 30h)
Writing any value to this register triggers the following events:
Clears flag
ARST (2Fh.r3)
Deactivates ARSTb signal if
ARSTEN (2Fh.w3)
and
ARSTS(2F.w2)
are both high
Deactivates pin UINTb if
ARSTIEN (2Fh.w1)
is enabled
MISS2 - Miscellaneous Status Register 0 (read 30h)
Bit 7:
SRSTD - Soft Reset with DRQ
This bit becomes high if host activates SRST in the ATAPI Device Control Register while DRQ is
high and the drive is selected. This bit is updated at rising edge of SRST.
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