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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: 70/116頁
文件大小: 787K
代理商: W88227QD
Preliminary/Confidential
Subject to change without notice
W88227F/W88227QD
- 66 -
1999/10/1 Rev: 0.70
MISC1 - Miscellaneous Control Register 1 - (write 2Fh)
This register is 0 after chip reset.
Bit 7:
ARRC - ATAPI Register Read Control
When this bit is high, the ATAPI registers can be read regardless of the value of BSY if the drive is
selected.
Bit 6:
SARRC - Shadow Drive ATAPI Register Read Control
When this bit is high, the Shadow ATAPI registers can be read regardless of the value of BSY if the
shadow drive is selected.
Bit 5-4: HRSTS[1:0] - obsolete
Bit 3:
ARSTEN - ARST Enable
When
ARSTEN
is high, internal signal ARSTB becomes active-low if host writes an DEVICE RESET
Command (opcode 08h) and reset the chip.
Bit 2:
ARSTS - ARSTb timing select
ARSTEN
ARSTS
type
function of ARSTB
remark
1
0
OD
ARSTb (reset-mode)
1
1
OD
ARSTb (interrupt-mode)
In interrupt-mode, writing any value to register
ARSTACK (30h,w)
de-activates ARSTB. In reset-
mode, ARSTB automatically de-activates itself after 256 system clocks.
Bit 1:
ARSTIEN - ATAPI Soft Reset Interrupt Enable
When this bit is high,
UINTb
becomes active-low whenever host writes an DEVICE RESET
Command (opcode is 08h).
Bit 0:
ARWC - ATAPI Register Write Control
Host writes to ATAPI registers (except Device Control Register) will not take effect when
ARWC and BSY are high, if BSY is not set by the following commands:
Opcode 90h is written to ATA Command Register while the drive is selected.
Opcode 90h is written to ATA Command Register while the shadow drive is selected if
SHDRV
(3Fh.6)
if high.
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