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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: 77/116頁
文件大小: 787K
代理商: W88227QD
Preliminary/Confidential
Subject to change without notice
W88227F/W88227QD
- 73 -
1999/10/1 Rev: 0.70
SHDCTL - Shadow Drive Control Register (read/write 3Fh)
Bit 7, 4, 3: Reserved
Bit 6:
SHDRV - Shadow Drive Enable
If
MDRV (2Fh.4)
is high, the bit reflects the level on
pin NDASP
until
SHDRVL (3Fh.5)
is set high. If
this bit is high, Shadow Register support for the non-existent Slave Drive is enabled..
Bit 5:
SHDRVL - Shadow Drive Enable Latch
Microprocessor should set this bit high at least 450 milliseconds after master reset to latch the setting
of
SHDRV (3Fh.6)
from
pin NDASP
if configured as a master drive. This
and host reset.
bit is 0 after chip reset
Bit 2:
DASPS2 - DASP Select 2
Setting this bit high enables
DASPEN (20h.w5)
during host reset. DASPS2 should normally be 0 to
comply with ATAPI specification. This bit is 0 after chip reset.
Bit 1:
DASPS1 - DASP Select 1
Setting this bit high enables
DASPEN (20h.w5)
following end of host reset. This bit is 0 after chip
reset.
Bit 0:
DASPSS - DASP SRST Select
Setting this bit high enables
DASPEN (20h.w5)
following the end of soft reset (SRST). This bit is 0
after chip reset and host reset.
CCSA0 - Configurable Chip Select Base Address Register 0 (read/write 40h)
The content of this register is used as the base address of Decoder Chip Select. The default of this register
after hardware reset is 0x40h.
CCSA1 - Configurable Chip Select Base Address Register 1 (read/write 41h)
The content of this register is used as the base address of CCS1. The default of this register after hardware
reset is 0x00h.
CCSA2 - Configurable Chip Select Base Address Register 2 (read/write 42h)
The content of this register is used as the base address of CCS2. The default of this register after hardware
reset is 0x00h.
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