PM7347 datasheet(44/341 Pages) PMC

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S/UNI®-JET Data Sheet

Released

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use

Document ID: PMC-1990267, Issue 3

Pin Name

Type

No.

Function

TDAT[15]

TDAT[14]

TDAT[13]

TDAT[12]

TDAT[11]

TDAT[10]

TDAT[9]

TDAT[8]

TDAT[7]

TDAT[6]

TDAT[5]

TDAT[4]

TDAT[3]

TDAT[2]

TDAT[1]

TDAT[0]

Input

C15

A16

B16

D15

C16

A17

B17

D16

C17

D18

E17

D19

D20

E18

F17

E19

The Transmit Cell Data Bus (TDAT[15:0]) carries the

ATM cell octets that are written to the transmit FIFO.

TDAT[15:0] is sampled on the rising edge of TFCLK and

is considered valid only when TENB is simultaneously

asserted and the S/UNI-JET has been selected via the

TADR[2:0] inputs.

The S/UNI-JET can be configured to operate with an 8-

bit wide or 16-bit wide ATM data interface via the ATM8

input pin. When configured for the 8-bit wide interface,

TDAT[15:8] are not used and should be tied to ground.

TPRTY

Input

G19

The Transmit Bus Parity (TPRTY) signal indicates the

parity of the TDAT[15:0] or TDAT[7:0] bus. If configured

for the 8-bit bus (via the ATM8 input pin), then parity is

calculated over TDAT[7:0]. If configured for the 16-bit

bus, then parity is calculated over TDAT[15:0].

A parity error is indicated by a status bit and a maskable

interrupt. Cells with parity errors are inserted in the

transmit stream, so the TPRTY input may be unused.

Odd or even parity selection is made using the TPTYP

TPRTY is sampled on the rising edge of TFCLK and is

considered valid only when TENB is simultaneously

asserted and the S/UNI-JET has been selected via the

TADR[2:0] inputs.

TSOC

Input

G20

The Transmit Start of Cell (TSOC) signal marks the start

of cell on the TDAT bus. When TSOC is high, the first

word of the cell structure is present on the TDAT bus.

It is not necessary for TSOC to be present for each cell.

An interrupt may be generated if TSOC is high during

any word other than the first word of the cell structure.

TSOC is sampled on the rising edge of TFCLK and is

considered valid only when TENB is simultaneously

asserted and the S/UNI-JET has been selected via the

TADR[2:0] inputs.

TENB

Input

H18

The Transmit Multi-PHY Write Enable (TENB) signal is

an active low input which is used along with the

TADR[2:0] inputs to initiate writes to the transmit FIFO.

When sampled low using the rising edge of TFCLK, the

word on the TDAT bus is written into the transmit FIFO

selected by the TADR[2:0] address bus. When sampled

high using the rising edge of TFCLK, no write is

performed, but the TADR[2:0] address is latched to

identify the transmit FIFO to be accessed.

A complete 53-octet cell must be written to the transmit

FIFO before it is inserted into the transmit stream. Idle

cells are inserted when a complete cell is not available.

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