PM5361-RI PMC-Sierra, Inc., PM5361-RI Datasheet - Page 20
PM5361-RI
Manufacturer Part Number
PM5361-RI
Description
SONET/SDH TRIBUTARY UNIT PAYLOAD PROCESSOR
Manufacturer
PMC-Sierra, Inc.
Datasheet
1.PM5361-RI.pdf
(108 pages)
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DATA SHEET
PMC-920526
Pin Name
ITMF
ISPE
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
Type
Input
Input
ISSUE 8
Pin
No.
52
48
Function
The active high incoming tributary multiframe
(ITMF) signal identifies the first frame of the
tributary multiframe for each STS-1 synchronous
payload envelope, AU3, or AU4 administrative
unit. ITMF is enabled by the setting the ITMFEN
register bit high. When ITMFEN bit is low, the
path overhead H4 byte is used to determine
tributary multiframe boundaries. ITMF is
selectable to pulse high during the V1 byte of the
first tributary or during the H4 byte which
indicates that the next frame is the first frame of
the tributary multiframe. Selection between
marking V1 or H4 bytes is controlled by the
ITMFH4 register bit. Pulses on ITMF are only
effective during the H4 or V1 byte positions, as
appropriate. ITMF is ignored at other byte
positions. The ITMFEN and ITMFH4 bits are
located in the master incoming configuration
register. ITMF is sampled on the rising edge of
SCLK.
The active high incoming synchronous payload
envelope (ISPE) signal identifies the bytes within
the transport envelope frame on the DIN[7:0] bus
that carry the AU3 or AU4 virtual containers, and
STS-1 synchronous payload envelopes. ISPE
must be brought high to mark each such byte.
ISPE is sampled on the rising edge of SCLK.
TRIBUTARY UNIT PAYLOAD PROCESSOR
12
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