PM5344SPTX Datasheet, PDF (34/212 Pages) PMC-Sierra, Inc – SONET/SDH PATH TERMINATING TRANSCEIVER TELECOM

DATA SHEET
PMC-930531
ISSUE 6
PM5344 SPTX
SONET/SDH PATH TERMINATING TRANSCEIVER
Pin Name
GDP
TCK
TFP
TD[7]
TD[6]
TD[5]
TD[4]
TD[3]
TD[2]
TD[1]
TD[0]
TPL
TC1J1V1
Type
Output
Input
Input
Output
Output
Output
Pin Function
No.
99 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.
19 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.
17 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.
16 The TRANSMIT bus data (TD[7:0]) carries the SONET/SDH frame in byte serial
15 ^{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
12 _{optionally set to zero or NPI. TD[7] is the most significant bit (corresponding to bit}
11 1 of each serial word, the first bit transmitted). TD[0] is the least significant bit
10 ^{(corresponding to bit 8 of each serial word, the last bit transmitted). TD[7:0] is}
updated on the rising edge of TCK.
9
8
7
3
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.
4
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.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE 20