PM7375-SC datasheet(43/430 Pages) PMC

43 / 430 page

PM7375 LASAR-155

DATA SHEET

PMC-931127

ISSUE 6

LOCAL ATM SAR & PHYSICAL LAYER

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

IRDYB

I/O

The active low initiator ready (IRDYB) signal is used to

indicate whether the initiator is ready to start or

continue a transaction. IRDYB works in conjunction

with TRDYB to complete transaction data phases.

When IRDYB is high and a transaction is in progress,

the initiator could not complete the current data phase

and is forcing a wait state. When IRDYB is low and a

transaction is in progress, the initiator has completed

the current data phase. Note, whether the data phase

is completed or not depends on the target's ready

signal TRDYB.

When the LASAR-155 is the initiator, IRDYB is an

output.

When the LASAR-155 is the target, IRDYB is an input.

When the LASAR-155 is not involved in the current

transaction, IRDYB is tri-stated.

IRDYB is updated on the rising edge of PCICLK or

sampled using the rising edge of PCICLK depending

on whether it is an output or an input.

STOPB

I/O

The active low stop (STOPB) signal is used by a target

to request the initiator to stop the current bus

transaction. When STOPB is high, the initiator

continues with the transaction. When STOPB is low,

the initiator should stop the current transaction.

When the LASAR-155 is the initiator, STOPB is an

input. If STOPB is sampled low, the LASAR-155

terminates the current transaction in the next PCICLK

cycle.

When the LASAR-155 is the target, STOPB is an

output. As a target, the LASAR-155 only issues

transaction stop requests when its internal bus latency

buffers are in a near overflow state.

When the LASAR-155 is not involved in the current

transaction, STOPB is tri-stated.

STOPB is updated on the rising edge of PCICLK or

sampled using the rising edge of PCICLK depending

on whether it is an output or an input.

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