CS5920 datasheet(100/160 Pages) AMCC

100 / 160 page

S5920 – PCI Product

Revision 1.01 – November 28, 2005

AMCC Confidential and Proprietary

DS1596

100

Data Book

Target Requested Retries

The S5920 initiates a retry for Pass-Thru writes when

the Write FIFO is full, and for Pass-Thru reads when

the Add-On cannot supply data within 16 PCI clocks

from the assertion of FRAME# (for the first data phase

of a burst). A retry is requested by a target by assert-

ing both STOP# and DEVSEL# while TRDY# is

deasserted. Figure 5 shows the behavior of the S5920

when performing a target-initiated retry.

Figure 48. Figure 4a. Target Disconnect Example 1

Figure 49. Figure 4b. Target Disconnect Example 2

Target Aborts

A target abort termination represents an error condi-

tion when no number of retries will produce a

successful target access. A target abort is uniquely

identified by the target deasserting DEVSEL# and

TRDY# while STOP# is asserted. When a target per-

forms an abort, it must also set bit 11 of its PCI Status

target abort when accessed. Target termination types

are summarized in Table 2.

FRAME#

IRDY#

TRDY#

DEVSEL#

STOP#

PCLK

(I)

(T)

(I) Driven by Initiator

(T) Driven by Target

(I)

(T)

Data

Transfered

Target

Disconnect

Identified

FRAME#

IRDY#

TRDY#

DEVSEL#

ST OP#

PCLK

(I)

(T)

(I) Driven by Initiato

(T) Driven by Targe

(I)

(T)

Data

Transfered

Target

Disconnect

Single

Data

Transferred

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