PM5362TUPP-PLUS
DATA SHEET
PMC-951010
ISSUE 6
SONET/SDH TRIBUTARY UNIT PAYLOAD PROCESSOR / PERFORMANCE MONITOR
Pin Name Type
Pin
Function
No.
ITMF
Input
52
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 third byte
after J1 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 each H4 or the third byte after
each J1 is controlled by the ITMFH4 register bit.
Pulses on ITMF are only effective during the H4
or third byte after each J1 byte positions, as
appropriate. ITMF is ignored at other byte
positions.
In incoming byte interface mode (IBMODE set
high), ITMF is sampled on the rising edge of
SCLK.
In incoming nibble interface mode (IBMODE set
low), ITMF marks the more significant nibble of
H4 or the third byte after J1, as appropriate. It is
ignored at the less significant nibble timeslots.
ITMF is sampled on the rising edge of NSCLK.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
17
PMC [ PMC-SIERRA, INC ]
