S5335 datasheet(101/189 Pages) AMCC

101 / 189 page

S5335 – PCI Bus Controller, 3.3V

Revision 5.01 – November 30, 2005

AMCC Confidential and Proprietary

DS1657

101

Data Sheet

Target Requested Retries

When the S5335 FIFO registers are accessed (S5335

as a target) and data is unavailable (empty FIFO) for

read transfers or cannot be accepted for write trans-

fers (full FIFO), the S5335 immediately terminates the

cycle by requesting a retry. The S5335 also initiates a

retry for Pass-Thru writes where the Add-On has not

completed the preceding Pass-Thru write by asserting

PTRDY#, and for Pass-Thru reads where the Add-On

cannot supply data within 8 PCI clocks (16 clocks for

the first data phase of a burst). A retry is requested by

a target asserting both STOP# and DEVSEL# while

TRDY# is deasserted. Figure 57 shows the behavior

of the S5335 when performing a target-initiated retry.

Target Aborts

A target abort termination represents an error condi-

tion where 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

ters never respond with a target abort when accessed.

If the S5335 encounters this condition when operating

as a PCI initiator, the S5335 sets bit 12 (received tar-

get abort) in the PCI Status register. Figure 58depicts

a target abort cycle.

Target termination types are summarized in Table 55.

Figure 57. Target-Initiated Retry

Table 55. Target Termination Types

Termination

DEVSEL#

STOP#

TRDY#

Comment

Disconnect

Data is transferred. Transaction needs to be reinitiated to complete.

Retry

off

Data was not transferred. Transaction should be tried later.

Abort

off

Data was not transferred. Fatal error.

PCI CLOCK

FRAME #

IRDY#

TRDY#

STOP#

DEVSEL#

INITIATOR

SEQUENCES IRDY#

+ FRAME# TO RETURN

TO IDLE STATE

TARGET

RETRY

SIGNALED

(T)

(I)

(I) = DRIVEN BY INITIATOR

(T) = DRIVEN BY TARGET

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