PM5312STTX Datasheet, PDF (25/140 Pages) PMC-Sierra, Inc – SONET/SDH TRANSPORT OVERHEAD TERMINATING TRANSCEIVER TELECOM STANDARD PRODUCT

DATA SHEET
PMC-930829
ISSUE 5
PM5312 STTX
SONET/SDH TRANSPORT TERMINATING TRANSCEIVER
Pin Name
GTICLK
TICLK
TSICLK
Pin
Type
Output
Input
Input
PQFP
Pin
No.
34
14
101
Function
The generated transmit clock (GTICLK) is used
in contra-directional timing-based systems to
provide timing for upstream circuitry. GTICLK is
a divide by four of the high speed multiplex
clock (TCLK) when STS-3 to STS-12
multiplexing is enabled. GTICLK is a divide by
three of TCLK when STS-1 to STS-3
multiplexing is enabled. GTICLK must be
connected directly to
TICLK for these contra-directional multiplexing
applications. GTICLK is a divide by eight of the
transmit serial incoming clock (TSICLK) when
the bit serial STS-1 mode is enabled. GTICLK
must be connected directly to TCLK for these
contra-directional STS-1 applications.
The transmit incoming clock (TICLK) provides
timing to sample the byte serial incoming
streams prior to multiplexing. TICLK is
synchronous with, but arbitrarily phase aligned
to TCLK. TICLK is nominally a 6.48 MHz, or
19.44 MHz clock. TIN1[7:0], TIN2[7:0],
TIN3[7:0], TIN4[7:0], TDIS, and TIFP are
sampled on the rising edge of TICLK.
The transmit serial incoming clock (TSICLK)
provides timing for updating the bit serial
outgoing stream when STS-1 mode is selected.
TSICLK is nominally a 51.84 MHz, 50% duty
cycle clock. TSOUT is updated on the rising
edge of TSICLK. TSICLK should be disabled
when the bit serial STS-1 interface is not used.
PROPRIETARY AND CONFIDENTIALTO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE 19