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參數資料
型號: W83759A
廠商: WINBOND ELECTRONICS CORP
英文描述: ADVANCED VL-IDE DISK CONTROLLER
中文描述: 先進的VL - IDE磁盤控制器
文件頁數: 19/41頁
文件大小: 334K
代理商: W83759A
W83759A
Publication Release Date: May 1995
- 19 -
Revision A1
Continued
CRX86h (ALTCTL)
Read / Write
Alternative Control Register
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
DMASL
_P
Reserved
EMD1
EMD0
PEMD1_P
PEMD0_P
SEMD1_P
SEMD0_P
Bit 7
DMASL
_P
Power-on setting value of
VGAOEL
pin.
After power-on, this bit can be programmed to modify
the DMA disable/enable power-on setting.
0 DMA mode enabled if SUSPEN_P = 0 and
ADV_P = 1
1 DMA mode disabled
Bit 6
Bit5
4
Reserved
EMD1, 0
(Read Only)
0 (default)
Inverse of power-on setting value of
IDEIOR
,
IDEIOW
pin
Initial setting of enhanced timing of IDE0 and IDE1
EMD1 EMD0 ATA PIO Mode
0 0 2 240
0 1 3 80
1 0 3 80
1 1 4 120
Cycle time (nS)
Bit3
2
PEMD1, 0_P
Initial setting of primary drive enhanced timing
After power-on, these bits can be programmed to modify
the primary drive enhanced timing.
PEMD1_P PEMD0_P ATA PIO mode Cycle time (nS)
0 0 2 240
0 1 3 180
1 0 3 180
1 `1 4 120
Bit1
0
SEMD1, 0_P
Initial setting of secondary drive enhanced timing
After power-on, these bits can be programmed to modify
the secondary drive enhanced timing
SEMD1_P SEMD0_P ATA PIO Mode Cycle time (nS)
0 0 2 240
0 1 3 180
1 0 3 180
1 1 4 120
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