PM7375-SC datasheet(37/430 Pages) PMC

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PM7375 LASAR-155

DATA SHEET

PMC-931127

ISSUE 6

LOCAL ATM SAR & PHYSICAL LAYER

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

TSOC

I/O

The transmit start of cell (TSOC) signal's function is

configured using input TXPHYBP.

When TXPHYBP is set high, TSOC becomes an output

and is expected to mark the start of cell on the

TDAT[7:0] bus. For this mode of operation, TSOC is

updated on the rising edge of SYSCLK.

When TXPHYBP is set low, TSOC becomes an input

and 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] bus. It is not necessary for TSOC to be

present at each cell. An interrupt may be generated if

TSOC is high during any word other than the first word

of the selected data structure. For this mode of

operation, TSOC is sampled using the rising edge of

SYSCLK.

TDAT[0]

TDAT[1]

TDAT[2]

TDAT[3]

TDAT[4]

TDAT[5]

TDAT[6]

TDAT[7]

I/O

The transmit cell data (TDAT[7:0]) bus' function is

configured using input TXPHYBP.

When TXPHYBP is set high, the TDAT[7:0] signals

become outputs and carry the ATM cell octets that are

written to a FIFO associated with an external physical

layer device. For this mode of operation, TDAT[7:0] is

updated on the rising edge of SYSCLK.

When TXPHYBP is set low, the TDAT[7:0] signals

become inputs and carry the ATM cell octets that are

read from an external FIFO. For this mode of

operation, TDAT[7:0] is sampled using the rising edge

of SYSCLK.

PM7375-SC Datasheet(PDF) 37 Page - PMC-Sierra, Inc

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