RELEASED
PM7380 FREEDM-32P672
DATA SHEET
PMC-1990262
ISSUE 5
FRAME ENGINE AND DATA LINK MANAGER 32P672
Pin Name Type
IRDYB I/O
Pin
Function
No.
P1
The active low initiator ready (IRDYB) signal is
used to indicate whether the initiator is ready to
start or continue with a transaction. IRDYB
works in conjunction with TRDYB to complete
transaction data phases. When IRDYB is set
high and a transaction is in progress, the
initiator is indicating it cannot complete the
current data phase and is forcing a wait state.
When IRDYB is set low and a transaction is in
progress, the initiator is indicating it has
completed the current data phase. The data
phase is completed when IRDYB is set low and
the target ready signal (IRDYB) is also set low.
When the FREEDM-32P672 is the initiator,
IRDYB is an output.
When the FREEDM-32P672 is the target,
IRDYB is an input.
When the FREEDM-32P672 is not involved in
the current transaction, IRDYB is tristated.
IRDYB is updated on the rising edge of PCICLK
or sampled on the rising edge of PCICLK
depending on whether it is an output or an
input.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA,INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
27
PMC [ PMC-SIERRA, INC ]
