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FW82371 数据表(PDF) 32 Page - Intel Corporation

部件名 FW82371
功能描述  PCI-TO-ISA / IDE XCELERATOR PIIX4
Download  284 Pages
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制造商  INTEL [Intel Corporation]
网页  http://www.intel.com
标志 INTEL - Intel Corporation

FW82371 数据表(HTML) 32 Page - Intel Corporation

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82371AB (PIIX4)
32
4/9/97 2:23 PM PIIX4aDS
INTEL CONFIDENTIAL
(until publication date)
PRELIMINARY
Name
Type
Description
SDDREQ
I
SECONDARY DISK DMA REQUEST. This input signal is directly driven from the IDE
device DMARQ signal. It is asserted by the IDE device to request a data transfer, and
used in conjunction with the PCI bus master IDE function. It is not associated with any
AT compatible DMA channel.
If the IDE signals are configured for Primary and Secondary, this signal is connected to
the corresponding signal on the Secondary IDE connector.
If the IDE signals are configured for Primary Master and Primary Slave, these signals
are used for the Primary Slave connector.
SDIOR#
O
SECONDARY DISK IO READ. In normal IDE mode, this is the command to the IDE
device that it may drive data onto the SDD[15:0] lines. Data is latched by the PIIX4 on
the negation edge of SDIOR#. The IDE device is selected either by the ATA register file
chip selects (SDCS1#, SDCS3#) and the SDA[2:0] lines, or the IDE DMA slave
arbitration signals (SDDACK#).
In an Ultra DMA/33 read cycle, this signal is used as DMARDY# which is negated by the
PIIX4 to pause Ultra DMA/33 transfers. In an Ultra DMA/33 write cycle, this signal is
used as the STROBE signal, with the drive latching data on rising and falling edges of
STROBE.
If the IDE signals are configured for Primary and Secondary, this signal is connected to
the corresponding signal on the Secondary IDE connector.
If the IDE signals are configured for Primary Master and Primary Slave, these signals
are used for the Primary Slave connector.
During Reset: High
After Reset: High
During POS: High
SDIOW#
O
SECONDARY DISK IO WRITE. In normal IDE mode, this is the command to the IDE
device that it may latch data from the SDD[15:0] lines. Data is latched by the IDE device
on the negation edge of SDIOW#. The IDE device is selected either by the ATA register
file chip selects (SDCS1#, SDCS3#) and the SDA[2:0] lines, or the IDE DMA slave
arbitration signals (SDDACK#).
In read and write cycles this signal is used as the STOP signal, which is used to
terminate an Ultra DMA/33 transaction.
If the IDE signals are configured for Primary and Secondary, this signal is connected to
the corresponding signal on the Secondary IDE connector.
If the IDE signals are configured for Primary Master and Primary Slave, these signals
are used for the Primary Slave connector.
During Reset: High
After Reset: High
During POS: High


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