PM5348 datasheet(39/238 Pages) PMC

39 / 238 page

PM5348 S/UNI-DUAL

DATA SHEET

PMC-950919

ISSUE 7

SATURN USER NETWORK INTERFACE

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

Pin Name

Type

No.

Function

TCA2

Output

The channel #2 transmit cell available

(TCA2) signal indicates when space for a

cell is available in the channel #2 transmit

FIFO. When TCA2 is sampled asserted, it

indicates that the channel #2 transmit FIFO

is not full. When TCA2 is sampled

deasserted, it indicates that either the

channel #2 transmit FIFO is near full and

can accept no more than four writes, or that

the channel #2 transmit FIFO is full (as

selected in the TACP FIFO Control register).

In addition, to reduce FIFO latency, the

FIFO cell depth can be programmed in the

TACP FIFO Control register. The active

polarity of TCA2 defaults to active high and

can be programmed in the S/UNI-DUAL

Configuration register.

TCA2 is updated on the rising edge of

TFCLK, (see note 13). TCA2 may become

metastable when transitioning from a logic

'1' to '0'.

TATP

Analog

Transmit analog test point (TATP) is provided

for production test purposes. Connect this

pin to ground.

LF1+,

LF1-,

LFO1

Analog

118

117

116

Passive components connected to the

channel #1 recovery loop filter (LF1+, LF1-

and LFO1) pins determine the dynamics of

the channel #1 clock recovery unit. Refer to

the Operation section for details.

LF2+,

LF2-,

LFO2

Analog

Passive components connected to the

channel #2 recovery loop filter (LF2+, LF2-

and LFO2) pins determine the dynamics of

the channel #2 clock recovery unit. Refer to

the Operation section for details.

PM5348 Datasheet(PDF) 39 Page - PMC-Sierra, Inc

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