PM7344 datasheet(51/293 Pages) PMC

51 / 293 page

PM7344 S/UNI-MPH

DATA SHEET

PMC-950449

ISSUE 6

MULTI-PHY USER NETWORK INTERFACE

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

Pin Name

Type

No.

Function

TSOC

Input

Transmit Start of Cell (TSOC). This input marks

the start of cell on the TDAT[7:0] bus. When

TSOC is high, the first octet of the cell is present

on the TDAT[7:0] stream. It is not necessary for

TSOC to be present at each cell. An interrupt

may be generated if TSOC is high during any

byte other than the first byte. TSOC is sampled

on the rising edge of TFCLK

TCA[4]

TCA[3]

TCA[2]

TCA[1]

Output

Transmit Cell Available (TCA[4:1]). These

output signals indicate when a cell is available in

the transmit FIFO for the corresponding port.

When high, TCA indicates that the

corresponding transmit FIFO is not full and a

complete cell may be written. When TCA goes

low, it can be configured to indicate either that

the corresponding transmit FIFO is near full and

can accept no more than four writes or that the

corresponding transmit FIFO is full. TCA[4:1]

will thus transition low on the rising edge of

TFLCK on which the 52nd or 48th byte is

sampled. To reduce FIFO latency, the FIFO

depth at which TCA indicates "full" can be set to

one, two, three or four cells.

INTB

Output

Active low Open-Drain Interrupt (INTB). This

signal goes low when an unmasked interrupt

event is detected on any of the internal interrupt

sources, including the internal HDLC

transceivers. Note that INTB will remain low

until all active, unmasked interrupt sources are

acknowledged at their source.

CSB

Input

113

Active low Chip Select (CSB). This signal must

be low to enable S/UNI-MPH register accesses.

If CSB is not used, (RDB and WRB determine

to an inverted version of RSTB.

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