PM5342 Datasheet, PDF (87/558 Pages) PMC-Sierra, Inc – SONET/SDH Payload Extractor/Aligner

DATA SHEET
PMC-970133
ISSUE 4
PM5342 SPECTRA-155
SONET/SDH PAYLOAD EXTRACTOR/ALIGNER
Pin Name
SS[23]/
AC1J1V1
Pin
Type
Input
SS[24]/ADP Input
SS[25]/GFP Input
PIN Function
No.
C9 The ADD bus composite timing signal
(AC1J1V1) identifies the frame, payload and
tributary multiframe boundaries on the ADD
data bus AD[7:0]. AC1J1V1 pulses high with
the ADD bus payload active signal (APL) set
low to mark the first STS-1 (STM-0/AU3)
Identification byte or equivalently the STM
identification byte (C1). Optionally, the
AC1J1V1 pulses high with APL set high to mark
the path trace byte (J1). Optionally, the
AC1J1V1 signal pulses high on the V1 byte to
indicate tributary multiframe boundaries.
Optional marking of the J1 and V1 bytes are
controlled using the DISJ1V1 bit in the
SPECTRA-155 Path/Mapper Configuration
register. Setting DISJ1V1 bit high enables
pointer interpretation on the ADD bus. Valid H1
and H2 pointer bytes must be provided on the
ADD data bus (AD[7:0]) to allow the J1 position
to be identified. Optionally, the H4 byte could
be provided on the ADD data bus to allow the
V1 position to be identified.
AC1J1V1 is sampled on the rising edge of ACK.
A8 The ADD bus data parity signal (ADP) indicates
the parity of the ADD bus signals. The ADD
data bus (AD[7:0]) is always included in parity
calculations. Internal register bits controls the
inclusion of the APL and AC1J1V1 signals in
parity calculations and the sense (odd/even) of
the parity. ADP is sampled on the rising edge
of ACK.
D9 The active high GENERATED bus reference
frame position signal (GFP) indicates when the
first byte of the synchronous payload envelope
(SPE byte 1 of STS-1 #1) is available on the
GD[1:0] bus. Note that GFP 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 GFP. GFP
is sampled on the rising edge of ACK.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE 65