PM5363 TUPP+622
TUPP+622
DATASHEET
PMC-1981421
ISSUE 4
SONET/SDH TRIBUTARY UNIT PAYLOAD PROCESSOR FOR 622 MBIT/S
INTERFACES
Pin Name
ITMF[4]
Type
Pin
No.
Function
Input
AC5 The active high incoming tributary multiframe #4
(ITMF[4]) signal identifies the first frame of the
tributary multiframe for each STS-1 synchronous
payload envelope, AU3, or AU4 administrative
unit in the STM-1 #4 stream (ID[31:24]). ITMF[4]
is enabled by setting the corresponding ITMFEN
register bit high. When ITMFEN bit is low, the
path overhead H4 byte is used to determine
tributary multiframe boundaries. ITMF[4] is
selectable to pulse high during the third byte
after J1 of the first frame of the tributary
multiframe 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 corresponding ITMFH4 register
bit. Pulses on ITMF[4] are only effective during
the H4 or third byte after each J1 byte positions,
as appropriate. When ITMFH4 is low, ITMF[4]
can be set high for the entire first frame of the
tributary multiframe. ITMF[4] must be low for the
2nd, 3rd, and 4th frame of the tributary multiframe.
When ITMFH4 is high, ITMF[4] can be set high
for the entire fourth frame of the tributary
multiframe. ITMF[4] must be low for the 1st, 2nd
and 3rd frame of the tributary multiframe.
In incoming STM-1 (STS-3) interface mode
(IHSMODEB set high), ITMF[4] is sampled on
the rising edge of SCLK.
In incoming STM-4 (STS-12) interface mode
(IHSMODEB set low), ITMF[4] is unused and
must be strapped low.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
30
PMC [ PMC-SIERRA, INC ]
