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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: 68/116頁
文件大小: 787K
代理商: W88227QD
Preliminary/Confidential
Subject to change without notice
W88227F/W88227QD
- 64 -
1999/10/1 Rev: 0.70
Bit 1-0: SCF[1:0] - Subcode Format Select
SCF[1:0]
Subcode Format
0
SMD0 (Philips)
1
SMD1 (EIAJ-1)
2
SMD2 (EIAJ-2)
3
Reserved
RASTA - DRAM Address Status Register - (read 2Dh)
Pin RA7-0 are input with weak pull-up during master reset or when
RTC (2Ah.2-0)
is 000b. RA7-4 are used as
power-on setting and RA3-0 can be used as general input when
RTC (2Ah.2-0)
is 000b. The status of RA7-0
can be read from
RASTA (2Dh,r)
.
MISC0 - Miscellaneous Control Register 0 - (write 2Eh)
Bit 7:
HIIEN - Host Interface Interrupt Enable
Setting this bit high enables the microprocessor interrupt of the host interface. Host interface
interrupt occurs at the following conditions:
SRST (Device Control Register) is written as 1 after 0 to either master or slave drive.
Execute Drive Diagnostics Command is written to either master or slave drive.
Any opcode is written to the ATAPI Command Register while the drive is selected except: (1)
command opcode is 08h, (2) command opcode is A0h and
APKTEN (18h.7)
is high.
IDE interface interrupt is cleared by the following:
Master reset
Reading register 37h
Writing 1 to
CLRBSY (20h.4)
Reserved
DRVEb - Drive Selection Enable
Bit 6:
Bit 5:
Setting this bit low enables selection of the drive if bit DRV in ATAPI Drive Select Register matches
the setting of
MDRV (2Eh.4)
.
MDRV - Master Drive
Bit 4:
Setting this bit high sets the drive to be selected when bit DRV in the ATAPI Drive Select Register is
set to 0 (Master Drive).
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