PM5344 datasheet(34/212 Pages) PMC

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PM5344 SPTX

DATA SHEET

PMC-930531

ISSUE 6

SONET/SDH PATH TERMINATING TRANSCEIVER

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

Pin Name

Type

No.

Function

GDP

Output

The GENERATED bus data parity signal (GDP) indicates the parity of the

GENERATED bus signals. The GENERATED data bus (GD[1:0]) is always

included in parity calculations. The internal register bits control the inclusion of the

GPL and GC1J1V1 signals in parity calculation and the sense (odd/even) of the

parity. GDP is updated on the rising edge of ACK.

TCK

Input

The transmit reference clock (TCK) provides timing for SPTX transmit functions.

TCK is nominally a 19.44 MHz or 6.48 MHz, 50% duty cycle clock. Frequency

offsets between TCK and ACK are accommodated by pointer justification events on

the transmit data stream. Inputs TFP, TPAIS[3:1] and TPFERF[3:1] are sampled on

the rising edge of TCK. Outputs TD[7:0], TPL, TDP, TC1J1V1 and FPOUT are

updated on the rising edge of TCK, while TPOHCLK[3:1] is updated on the falling

edge of TCK.

TFP

Input

The active high transmit reference frame position (TFP) is used to align the

SONET/SDH transport frame generated by the SPTX device to a system

reference. TFP indicates when the first byte of the synchronous payload envelope

(SPE byte 1 of STS-1 #1) is available on the TD[7:0] bus. TFP should be brought

high for a single TCK period every 2430 TCK cycles, or multiples thereof. TFP may

be tied low if such synchronization is not required. TFP is sampled on the rising

edge of TCK.

TD[7]

TD[6]

TD[5]

TD[4]

TD[3]

TD[2]

TD[1]

TD[0]

Output

The TRANSMIT bus data (TD[7:0]) carries the SONET/SDH frame in byte serial

format. The transport overhead bytes, with the exception of H1, H2 pointer bytes,

are set to zero. The fixed stuff columns in a tributary based SPE (VC) may be

optionally set to zero or NPI. TD[7] is the most significant bit (corresponding to bit

1 of each serial word, the first bit transmitted). TD[0] is the least significant bit

(corresponding to bit 8 of each serial word, the last bit transmitted). TD[7:0] is

updated on the rising edge of TCK.

TPL

Output

The TRANSMIT bus payload active signal (TPL) indicates when TD[7:0] is carrying

a payload byte. It is set high during path overhead and payload bytes and low

during transport overhead bytes. TPL is set high during the H3 byte to indicate a

negative pointer justification event and set low during the byte following H3 to

indicate a positive pointer justification event. TPL is updated on the rising edge of

TCK.

TC1J1V1

Output

The TRANSMIT bus composite timing signal (TC1J1V1) identifies the frame,

payload and tributary multiframe boundaries on the TRANSMIT data bus TD[7:0].

TC1J1V1 pulses high with the TRANSMIT bus payload active signal (TPL) set low

to mark the first STS-1 Identification byte or equivalently the STM identification

byte (C1). TC1J1V1 pulses high with TPL set high to mark the path trace byte (J1).

The TC1J1V1 signal pulses high on the V1 byte to indicate tributary multiframe

boundaries. TC1J1V1 is updated on the rising edge of TCK.

PM5344 Datasheet(PDF) 34 Page - PMC-Sierra, Inc

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