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參數(shù)資料
型號: W88113C
廠商: WINBOND ELECTRONICS CORP
英文描述: ATAPI CD-ROM DECODER & CONTROLLER
中文描述: ATAPI的CD - ROM解碼器
文件頁數(shù): 64/102頁
文件大小: 573K
代理商: W88113C
W88113C
Publication Release Date: Mar. 1999
- 60 - Revision 0.61
DFFCNTL - Data FIFO Threshold Control Register - (read/write 89h)
Bit 7,6: Reserved
Bit 5-3: DFFHT[2:0] - Data FIFO High Threshold
When the number of bytes in Data FIFO larger than DFFHT, device stops pre-fetch to
prevent FIFO overrun. Since the default setting of
CAS8B (88h.2)
is low, the default value of
DFFHT is 001b.
DFFHT[2:0]
Threshold
000b
28
001b
24
default
011b
16
Bit 2-0: DFFLT[2:0] - Data FIFO Low Threshold
When the number of bytes in Data FIFO less than DFFLT, device de-activates DMARQ to
prevent FIFO underrun in traditional DMA mode. When the number of bytes in Data FIFO
less than DFFLT, device would stop issuing DSTROBE to prevent FIFO underrun in Ultra
DMA data-in mode.
DFFLT[2:0]
Threshold
000b
4
default
001b
8
011b
16
ATCTL - Auxiliary Timing Control Register - (read/write 8Ah)
This register is set 00h after chip reset, host reset and firmware reset.
Bit 7: XOFF - Crystal Off
Setting his bit high can turn off the crystal cell and save power consumption. XOFF is de-
activated by the following events:
Chip reset or host reset or firmware reset
Command write from the host while the drive is selected
Host issues Diagnostic Command, regardless of drive selection
Host issues command to shadow drive if
SHDRV (3Fh.6)
is enabled
Host set bit SRST in ATAPI Device Control Register high, regardless of drive selection
Bit 6: reserved.
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