PM7326 datasheet(40/238 Pages) PMC

40 / 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

LTPA

Input

(Master)

Tri-state

(Slave)

R23

Loop Transmit Packet Available. LTPA indicates

the availability of space in the selected polled port

when polled using the LTADR[11:0] signals.

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

not enabled.

If transmit master mode is selected, this signal is an

input. The PHY device whose address or address

range matches LTADR[11:0] drives the LTPA signal

with the transmit FIFO availability status of the

selected logical channel N LTCLK cycles after the

match. If the PHY device is a UTOPIA device, N=1.

If the PHY device is an Any-PHY device, N=2.

Assertion of LTPA indicates that at least K entire cell

buffer is available in that logical channel. K = 1 if

the register LoopTxTwoCellEn = 0. K = 2 if the

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

state output. The S/UNI APEX drives LTPA 1

LTCLK after LTADR[5:0] matches the programmed

LoopTxSlaveAddr register. A logical high indicates

that at least one cell is available for transmission.

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

of LTCLK.

LTENB

Output

(Master)

Input

(Slave)

T24

Loop Transmit Enable. LTENB indicates cell

transfers to UTOPIA and SCI-PHY devices. The

device is selected via a match on LTADR[11:0] when

LTENB is last sampled high.

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

not enabled.

If transmit master mode is selected, this signal is an

output. LTENB is held low for the duration of the cell

transfer.

If receive slave mode is selected, this signal is an

input.

LTENB is sampled/updated on the rising edge of

LTCLK.

PM7326 Datasheet(PDF) 40 Page - PMC-Sierra, Inc

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