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參數(shù)資料
型號(hào): W88227QD
廠商: WINBOND ELECTRONICS CORP
元件分類: 消費(fèi)家電
英文描述: ATAPI CD-ROM Decoder(支持ATAPI標(biāo)準(zhǔn)的CD-ROM解碼器)
中文描述: SPECIALTY CONSUMER CIRCUIT, PQFP128
封裝: LQFP-128
文件頁數(shù): 89/116頁
文件大小: 787K
代理商: W88227QD
Preliminary/Confidential
Subject to change without notice
W88227F/W88227QD
- 85 -
1999/10/1 Rev: 0.70
ATCTL - Auxiliary Timing Control Register - (read/write 8Ah)
This register is set 00h after chip reset, host reset and firmware reset.
Bit 7:
DXOFF - DX Crystal Loop Off
Setting his bit high can turn off the feedback loop beteween DXI and DXO and save power
consumption.
Bit 6:
UDTA - Ultra DMA Timing Acceleration
If this bit is high, the internal Ultra DMA base frequency is doubled from the clock sourxe that is
selected by
UCLKS (8Ah.3)
.
Bit 5-4: UDT[1:0] - Ultra DMA Timing Control
These two bits define the Ultra DMA Timing Factor,
udtf
, which control the timing of Ultra DMA
transfer.
Tcyc = ( 2 + udtf )
×
Tudma
where Tudma is clock period depends on setting of
UDTA (8Ah.6)
and
UCLKS (8Ah.3)
and Tcyc is Ultra DMA cycle time (from DSTROBE edge to DSTROBE edge)
Device firmware should set
udtf
according to the clock source and the assigned Ultra DMA transfer
mode after host issues SET FEATURE command.
Bit 3:
UCLKS - Ultra DMA Clock Select
If this bit is high, the clock source for UDMA is from
pin ACLK.
If this bit is low, the clock
source is system clock.
Bit 2-0: REFT[2:0] - Refresh Timing Control
The frequency of refresh is controlled by
REFT2-0 (8Ah.2-0)
to support long refresh. The value after
chip reset is 0. The refresh cycle defaults to be issued once after 256 system clocks.
refresh period = 256
×
2reft system clock periods
STA0M - Status 0 Mask Register - (write 8Ch)
If any following bit is enabled, the flag
STAERR (80h.r6)
becomes high when the corresponding status bit
becomes active.
Bit 7 - CRCOK Mask
Bit 6 - ILSYNC Mask
Bit 5 - NOSYNC Mask
Bit 4 - LBLK Mask
Bit 3 - WSHORT Mask
Bit 2 - SBLK Mask
Bit 1 - BIN0 Mask
Bit 0 - UCEBLK Mask
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