PM5342 datasheet(91/558 Pages) PMC

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PM5342 SPECTRA-155

DATA SHEET

PMC-970133

ISSUE 4

SONET/SDH PAYLOAD EXTRACTOR/ALIGNER

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

Table 7

- Nibble Telecombus Mode (SMODE[2:0]=001)

Pin Name

Type

No.

Function

SS[0]/DCK

Input

D15

The DROP bus clock (DCK) provides timing for

the DROP bus interface. For nibble mode,

DCK is nominally a 38.88 MHz or 12.96 MHz,

50% duty cycle clock. Frequency offsets

between RCLK and DCK/2 are accommodated

by pointer justification events on the DROP bus.

DFP is sampled on the rising edge of DCK.

Outputs DPL, DC1J1V1, DDP and DD[3:0] are

updated on the rising edge of DCK.

SS[1]/DFP

Input

B16

The active high DROP bus reference frame

position signal (DFP) indicates when the first

nibble of the synchronous payload envelope

(upper nibble of SPE byte 1 of STS-1 #1) is

available on the DD[3:0] bus. Note that DFP

has a fixed relationship to the SONET/SDH

frame; the start of the SPE is determined by the

STS (AU) pointer and may change relative to

DFP. DFP is sampled on the rising edge of

DCK.

SS[2]/DD[0]

SS[3]/DD[1]

SS[4]/DD[2]

SS[5]/DD[3]

Output A16

C15

B15

A15

The DROP bus data (DD[3:0]) contains the

SONET/SDH receive payload data. The

transport overhead nibbles, with the exception

of the H1, H2 pointer nibbles, are set to zeros.

The fixed stuff columns in a tributary mapped

SPE (VC) may also be optionally set to zero or

NPI. DD[3] is the most significant bit

(corresponding to bit 1 or 5 of each serial word,

the bit received first or fifth, respectively).

DD[0] is the least significant bit (corresponding

to bit 4 or 8 of each serial word, the fourth or

last bit received, respectively). DD[3:0] is

updated on the rising edge of DCK.

SS[6]

SS[7]

SS[8]

SS[9]

Output C14

D13

B14

A14

Reserved.

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