PM7350-PI datasheet(35/241 Pages) PMC

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RELEASED

PM7350 S/UNI-DUPLEX

DATA SHEET

PMC-1980581

ISSUE 5

DUAL SERIAL LINK PHY MULTIPLEXER

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

Ball

Name

Type

Ball

No.

Function

High Speed LVDS Links

ICA

I/O

The Input Cell Available (ICA) signal provides cell-

level flow control. ICA’s direction depends on the

state of the IMASTER input.

As a SCI-PHY/Utopia bus master (IMASTER = 1,

IANYPHY = 0) the S/UNI-DUPLEX polls up to 32

PHYs using the PHY address signals IADDR[4:0].

A PHY device being addressed by IADDR[4:0] is

expected to indicate whether or not it has a

complete cell available for transfer by driving ICA

during the clock cycle following that in which it is

addressed. When a cell transfer is in progress, the

S/UNI-DUPLEX will not poll the PHY device which

is sending the cell so PHY devices need not

support the cell availability indication during cell

transfer. The selection of a particular PHY device

from which to transfer a cell is indicated by the state

of IADDR[4:0] during the last cycle IENB is high.

As a bus slave (IMASTER = 0) the S/UNI-DUPLEX

indicates the ability to accept additional cells via the

ICA output. When IAVALID is sampled high in SCI-

PHY or low in Any-PHY configuration, ICA is

asserted if the cell FIFO for the logical channel

addressed by IADDR[4:0] has at least one empty

cell buffer. If the FIFO is full, ICA is deasserted. If a

cell transfer is in progress that will fill a logical

channel FIFO, ICA will also be deasserted. When

IAVALID is sampled low in SCI-PHY or high in Any-

PHY configuration, ICA becomes high impedance.

ICA is delayed by an additional clock cycle in Any-

PHY configuration. The buffer status for the

particular logical channel involved is stale for a

maximum of 16 cycles after the start of the cell

transfer when using a 8 bit bus or 12 cycles when

using a 16 bit bus. Therefore, the master should

refrain from polling that logical channel in the

interim.

PM7350-PI Datasheet(PDF) 35 Page - PMC-Sierra, Inc

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