PM7375-SC datasheet(42/430 Pages) PMC

42 / 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

FRAMEB

I/O

The active low cycle frame (FRAMEB) is used to

identify a transaction cycle. When FRAMEB

transitions low, the start of a bus transaction is

indicated. FRAMEB remains low to define the

duration of the cycle. When FRAMEB transitions high,

the last data phase of the current transaction is

indicated.

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

output.

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

input.

When the LASAR-155 is not involved in the current

transaction, FRAMEB is tri-stated.

FRAMEB 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.

TRDYB

I/O

The active low target ready (TRDYB) signal is used to

indicate whether the target is ready to start or continue

a transaction. TRDYB works in conjunction with

IRDYB to complete transaction data phases. When

TRDYB is high and a transaction is in progress, the

target could not complete the current data phase and

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

transaction is in progress, the target has completed

the current data phase. Note, whether the data phase

is completed or not depends on the initiator's ready

signal IRDYB.

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

input.

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

output. It is expected that for LASAR-155 register

accesses, TRDYB will be used to extend data phases

to multiple PCICLK cycles.

When the LASAR-155 is not involved in the current

transaction, TRDYB is tri-stated.

TRDYB 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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