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FW21555BA 数据表(PDF) 5 Page - Intel Corporation |
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FW21555BA 数据表(HTML) 5 Page - Intel Corporation |
5 / 6 page 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 |
类似零件编号 - FW21555BA |
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类似说明 - FW21555BA |
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