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FW21555BA 数据表(PDF) 5 Page - Intel Corporation

部件名 FW21555BA
功能描述  21555AA/BA and 21555AB/BB Differences
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制造商  INTEL [Intel Corporation]
网页  http://www.intel.com
标志 INTEL - Intel Corporation

FW21555BA 数据表(HTML) 5 Page - Intel Corporation

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21555AA/BA and 21555AB/BB Differences
Application Note
5
1.0
Introduction
This document defines the differences between the 21555AA/BA bridge when compared with the
21555AB/BB bridge. The 21555 bridge is a second generation Non-Transparent PCI-to-PCI
bridge.
1.1
Changes to the 21555 Bridge
After the introduction of the 21555AA/BA bridge, two errata were discovered
The I2O circuitry would not work in asynchronous mode.
The BSDL circuitry was driving data one cycle late.
Additionally, the PCI standards committee ratified the new PCI 2.3 Specification, which required
an additional bit to be added to the control register and status register.
The new 21555AB/BB bridge version addresses all three of these issues.
Note:
This Differences document is not a stand-alone document and does not provide complete 21555
bridge details. The intent here is only to highlight the feature differences between the
21555AA/BA and the 21555BA/BB steppings. Please be sure to review the data sheet and spec
updates for more complete information on the device.
2.0
Stepping Differences
Table 1.
Stepping Differences
3.0
I2O Asynchronous Operation
The 21555AA/BA devices would not operate asynchronously. This behavior has been corrected in
the 21555AB/BB device. Please refer to the device data sheet for information on I2O operation.
Package Markings
REV_ID
Register
Valuea
a.
Identified in a PCI system by reading the value in the REV_ID register.
Speed (MHz)
Stepping
Intel FW21555AA
02h
33
A2
Intel FW21555BA
02h
66
A2
Intel FW21555AB
03h
33
A3
Intel FW21555BB
03h
66
A3


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