PM5343STXC View Datasheet(PDF) - PMC-Sierra
Part Name
Description
MFG CO.
'PM5343STXC' PDF : 198 Pages View PDF
DATA SHEET
PMC-930303
ISSUE 6
PM5343 STXC
SONET/SDH TRANSPORT OVERHEAD TRANSCEIVER
The TSOP block is intended to operate with a downstream serializer (the Parallel
to Serial Converter block; or an external parallel to serial converter) that accepts
the transmit stream in byte serial format and serializes it at the appropriate line
rate.
9.9 Parallel to Serial Converter
The Parallel to Serial Converter (PISO) block provides the final stage of digital
processing for the transmit data stream. The PISO block converts the data
stream from parallel to serial format.
A generated transmit clock (GTICLK) is provided by dividing the incoming
transmit line clock (TSICLK, or TXC+/-) by eight. GTICLK must be externally
connected to TICLK when processing a bit serial stream.
9.10 Receive Section Trace Buffer
The receive portion of the SONET Section Trace Buffer captures the received
section trace identifier message (J0 byte) into microprocessor readable registers.
It contains two pages of trace message memory. One is designated the capture
page and the other the expected page. Section trace identifier data bytes from
the receive stream are written into the capture page. The expected identifier
message is downloaded by the microprocessor into the expected page. On
receipt of a trace identifier byte, it is written into next location in the capture page.
The received byte is compared with the data from the previous message in the
capture page. An identifier message is accepted if it is received unchanged
three times, or optionally, five times. The accepted message is then compared
with the expected message. If enabled, an interrupt is generated when the
accepted message changes from matching to mismatching the expected
message and vice versa. If the current message differs from the previous
message for eight consecutive messages, the received message is declared
unstable. The received message is declared stable when the received message
passes the persistency criterion (three or five identical receptions) for being
accepted. An interrupt may be optionally generated on entry to and exit from the
unstable state. Optionally, AIS may be inserted in the ROUT[7:0] bus when the
receive message is in the mismatched or unstable state.
The length of the section trace identifier message is selectable between 16 bytes
and 64 bytes. When programmed for 16 byte messages, the section trace buffer
synchronizes to the byte with the most significant bit set to high and places the
byte at the first location in the capture page. When programmed for 64 byte
messages, the section trace buffer synchronizes to the trailing carriage return
(CR = 0DH), line feed (LF = 0AH) sequence and places the next byte at the
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND FOR ITS CUSTOMERS’ INTERNAL USE 42
Share Link: 
