CS5920 datasheet(42/160 Pages) AMCC

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S5920 – PCI Product

Revision 1.01 – November 28, 2005

AMCC Confidential and Proprietary

DS1596

Data Book

Bit

Description

Detected Parity Error. This bit is set whenever the S5920 detects a parity error. It is set independent of the state

of Command Register Bit 6. The bit is cleared by writing a 1.

Signaled System Error. This bit is set whenever the S5920 generates the SERR# signal. This bit can be reset by

writing a 1.

Received Master Abort. Bus master devices set this bit to indicate a bus master transaction has been termi-

nated due to a master abort. The S5920 is a target device and hardwires this to 0.

Received Target Abort. This bit is set by a bus master when its transaction is terminated by a target abort from

the currently addressed target device. This bit is required for bus masters and is hardwired to 0 in the S5920.

Signaled Target Abort. This bit is set the target device whenever it terminates a transaction with a target abort.

The S5920 does not issue target aborts and hardwires this bit to 0.

10:9

Device Select Timing. These bits are read-only and define the DEVSEL# timing for a target device. The S5920

is a medium PCI device.

Data Parity Reported. Only implemented by bus mastering devices to notify a parity error has been detected.

This is not applicable to the S5920 and is hardwired to 0.

Fast Back-to-back Capable. This read-only bit indicates if a target device supports fast back-to-back transac-

tions. The S5920 supports this feature and hardwires the bit to 1.

UDF Supported. 1 = device supports user-definable features. 0 = device does not support user- definable fea-

tures. The S5920 implements definable memory regions and hardwires this bit to 0.

66 MHz Capable. 1 = device is capable of running at 66 MHz. 0 = device is capable of running at 33 MHz. This

bit is hardwired to 0.

4:0

Reserved. Hardwired to zero.

CS5920 データシート(PDF) 42 Page - Applied Micro Circuits Corporation