PM7347 datasheet(306/341 Pages) PMC

306 / 341 page

S/UNI®-JET Data Sheet

Released

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

306

Document ID: PMC-1990267, Issue 3

Figure 51 Generic Transmit Stream

TCLK

TDATO

Overhead Placeholder Bits

Bit 5

Bit 8

Bit 7

Bit 6

Bit 1

Bit 4

Bit 3

Bit 2

ATM Ce ll

Octet n +1

TOHM

TIOHM

TICLK

TDATO

Overhead Placeholder Bits

Bit 1

Bit 4

Bit 3

Bit 2

Bit 7

Bit 8

Bit 6

Bit 4

Bit 5

Bit 3

TOHM

TIOHM

TICLK bit logic 0:

TICLK bit logic 1:

ATM Ce ll

Octe t n

Bit 5

Bit 6

Bit 7

Bit 8

ATM Ce ll

Octe t n

TICLK

ATM Ce ll

Octet n +1

The Generic Transmit Stream diagram (Figure 51) illustrates overhead indication positions when

interfacing to a non-PLCP based transmission system not supported by the SUNI-QJET. The

overhead bit placeholder positions are indicated using the TIOHM input. The ATM cells

presented in the TDATO transmit stream are held off to include the overhead placeholders. The

location of these placeholder positions is indicated by TOHM. A downstream framer inserts the

correct overhead information in the placeholder positions.

The delay between TIOHM and TOHM is dependent on the state of the TICLK bit of the S/UNI-

JET Transmit Configuration Register. If the TICLK bit is a logic zero, TOHM is updated on the

falling TCLK edge. TCLK is a flow-through version of TICLK and the propagation delay

between TICLK and TCLK may vary depending on specific configurations. If the TICLK bit is a

logic one, TOHM is presented on the fifth rising edge of TICLK after the rising edge which

samples TIOHM.

PM7347 Datasheet(PDF) 306 Page - PMC-Sierra, Inc

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