PM7344 datasheet(241/293 Pages) PMC

241 / 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

225

FUNCTIONAL TIMING

Figure 18

- Arbitrary Rate Transmit Interface

TDN/TOHO[x]

TFPI/TOHI

TCLKI

TDP/TDD[x]

TCLKO

BITN BITN+1 BITN+2 BITN+3 BITN+4

ATM Cell Data

TSOH TSOH

Overhead

BITN+5 BITN+6 BITN+7

ATM Cell Data

The S/UNI-MPH is configured to select the arbitrary transmit interface. TOHO

marks the location of the transmission system overhead placeholder bits (TSOH)

in the TDD stream. The delay between TOHI and TOHO is fixed to be 2.5 clock

periods starting at the rising TCLKI edge where TOHI is sampled and finishing at

the falling TCLKO[x] edge where TOHO[x] is generated. It should be noted that

the outputs are clocked out on TCLKO[x] which is a flow-through version of

TCLKI and which could be significantly delayed from TCLKI. The active polarity

(here shown as active high) of the TOHI and TOHO signals can be inverted using

the TOHINV and TDNINV bits in the Transmit Interface Configuration register.

The active edge that is used to sample TFPI (here shown as the rising edge) as

well as update TOHO[x] and TDD[x] can be inverted using the TFALL and TRISE

bits in the Transmit Interface Configuration register. The octet alignment of the

bit position labeled "BITM+1" in the timing diagram is controlled by the TOCTA bit

in the Transmit Interface Configuration register.

Figure 19

- Arbitrary Rate Receive Interface

RCLKI[x]

RDN/ROH[x]

RDP/RDD[x]

BITN BITN+1 BITN+2 BITN+3

ATM Cell Data

Overhead

TSOH TSOH

ATM Cell Data

BITN+4 BITN+5 BITN+6 BITN+7

PM7344 Datasheet(PDF) 241 Page - PMC-Sierra, Inc

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