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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: 63/116頁
文件大小: 787K
代理商: W88227QD
Preliminary/Confidential
Subject to change without notice
W88227F/W88227QD
- 59 -
1999/10/1 Rev: 0.70
HICTL1 - Host Interface Control Register - (write/read 20h)
The value in this register is 26h after chip reset.
Bit 7 : reserved
Bit 6:
PDIAGEN - Pin NPDIAG Enable
Setting this bit high causes pin NPDIAG to the active-low state. PDIAGEN is automatically de-
activated, causing pin NPDIAG to be high-impedance, by the following events:
Reception of Execute Drive Diagnostics Command (ATA opcode 90h)
Reception of ATA Soft Reset (SRST)
Master reset
DASPEN - Pin NDASP Enable
Bit 5:
Setting this bit high activates pin NDASP. DASPEN is automatically de-activated, causing pin
NDASP to be high-impedance, by the following events:
Reception of Execute Drive Diagnostics Command (ATA opcode 90h)
Reception of ATA Soft Reset (SRST)
Master reset
This bit is also controlled by DASPS2 (3Fh.2), DASPS1 (3Fh.1) and DASPSS (3Fh.0).
Bit 4:
CLRBSY - Clear BSY
Setting this bit high causes the flag BSY in the ATAPI Status Register to become low if
APKT (30h.r0)
is not high. This bit is self-clear after the BSY is clear.
Bit 3:
SETBSY - Set BSY
Setting this bit high causes the flag BSY in the ATAPI Status Register to become high if
APKT
(30h.r0)
is not high. This bit is self-clear after the BSY is set.
SCoD - Select Command-Packet-FIFO or Data
Bit 2:
The data received from ATAPI Data port is stored in Packet FIFO if this bit is high. This bit is also
controlled by
ADTT (17h.w2)
and
APKTEN (18h.7)
.
RDYEN - Pin IORDY Enable
Bit 1:
Setting this bit high enables IORDY (pin 49) to work with HRDb (pin 50).
Bit 0:
IO16EN - Pin IOCS16b Enable
Setting this bit high allows pin IOCS16b to become active-low when 16-bit data access is in use. This
bit should be enabled in normal operation.
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