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參數(shù)資料
| 型號(hào)： | ISD-300A1 |
| 英文描述： | Universal Serial Bus |
| 中文描述： | 通用串行總線 |
| 文件頁(yè)數(shù)： | 18/67頁(yè) |
| 文件大?。?/td> | 580K |
| 代理商： | ISD-300A1 |
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ISD-300A1
13
October 19, 2001
Address
Field Name
Description
On-board
ROM Defaults
0xC
SYS_IRQ
DISK_READY
ATA Translation Enable
ATA UDMA Enable
ATAPI UDMA Enable
ROM UDMA Mode
Bits(7) – read only
This bit reflects the current logic state of the SYS_IRQ input.
Bit(6) – read only
This bit reflects the current logic state of the DISK_READY input.
Bit(5)
Enable ATAPI to ATA protocol translation enable. If enabled, AND if an
ATA device is detected, ATA translation is enabled.
Note: If Skip
ATA/ATAPI Device Initialization is set ‘1’, Force ATA Device must also be
set ‘1’ in order to utilize ATA translation. Software must further issue an
INQUIRY command followed with an MSC reset to enable ATA translation
operation.
0
ATA Translation Disabled
1
ATA Translation Enable
Bit(4)
Enable Ultra Mode data transfer support for ATA devices. If enabled, AND
the ATA device reports UDMA support, the ISD-300A1 will utilize UDMA
data transfers.
0
Disable ATA device UDMA support
1
Enable ATA device UDMA support
Bit(3)
Enable Ultra Mode data transfer support for ATAPI devices. If enabled,
AND the ATAPI device reports UDMA support, the ISD-300A1 will utilize
UDMA data transfers.
0
Disable ATAPI device UDMA support
1
Enable ATAPI device UDMA support
Bits(2:0)
ROM UDMA Mode indicates the highest UDMA mode supported by the
product. The ISD-300A1 will utilize the lesser of ROM UDMA Mode or the
highest mode supported by the device.
Note: UDMA read operation mode
timing is controlled by the device
.
mode 0 000 133.3 ns per 16-bit word write
mode 1 001 100 ns per 16-bit word write
mode 2 010 66.7 ns per 16-bit word write
mode 3 011 66.7 ns per 16-bit word write
mode 4 100 33.3 ns per 16-bit word write
0x00
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