PM7326 datasheet(49/238 Pages) PMC

49 / 238 page

PM7326 S/UNI APEX

DATA SHEET

PMC-1981224

ISSUE 6

ATM/PACKET TRAFFIC MANAGER AND SWITCH

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

Pin Name

Type

No.

Function

WTPA

Input

(Master)

Tri-state

(Slave)

AD21

WAN Transmit Packet Available. WTPA indicates

cell availability.

This pin is in Hi-Z when the WAN transmit interface

is not enabled.

If master mode is selected, this signal is an input.

The PHY device whose address or address range

matches WTADR[2:0] drives the WTPA signal with

the transmit FIFO availability status of the selected

logical channel N WTCLK cycles after the match. If

the PHY devices are UTOPIA devices, N=1. If the

PHY devices are Any-PHY devices, N=2. Assertion

of WTPA indicates that at least one entire cell buffer

is available in that logical channel.

If slave mode is selected, this signal is a tri-state

output and the S/UNI APEX plays the roll of a single

port UTOPIA L2 slave device driving the WTPA

when the WTADR matches the programmed

WANTxSlaveAddr register. A logical high indicates

that at least one cell is available for transmission.

WTPA is sampled/updated/Hi-Z’d on the rising edge

of WTCLK.

WTENB

Output

(Master)

Input

(Slave)

AC20

WAN Transmit Enable. WTENB indicates cell

transfers to UTOPIA and SCI-PHY devices. The

device is selected via a match on WTADR[2:0] when

WTENB is last sampled high.

This pin is in Hi-Z when the WAN transmit interface

is not enabled.

If master mode is selected, this signal is an output.

If slave mode is selected, this signal is an input.

WTENB is held low for the duration of the cell

transfer.

WTENB is sampled/updated on the rising edge of

WTCLK.

PM7326 Datasheet(PDF) 49 Page - PMC-Sierra, Inc

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