PM5363 TUPP+622
TUPP+622
DATASHEET
PMC-1981421
ISSUE 4
SONET/SDH TRIBUTARY UNIT PAYLOAD PROCESSOR FOR 622 MBIT/S
INTERFACES
Pin Name
ITMF[1]
Type
Pin
Function
No.
Input
U4
The active high incoming tributary multiframe #1
(ITMF[1]) signal identifies the first frame of the
tributary multiframe for each STS-1 synchronous
payload envelope, AU3, or AU4 administrative
unit in the STM-4 or STM-1 #1 stream (ID[7:0]).
ITMF[1] 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[1] 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[1] are only effective
during the H4 or third byte after each J1 byte
positions, as appropriate. When ITMFH4 is low,
ITMF[1] can be set high for the entire first frame
of the tributary multiframe. ITMF[1] must be low
for the 2nd, 3rd, and 4th frame of the tributary
multiframe. When ITMFH4 is high, ITMF[1] can
be set high for the entire fourth frame of the
tributary multiframe. ITMF[1] 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[1] is sampled on
the rising edge of SCLK.
In incoming STM-4 (STS-12) interface mode
(IHSMODEB set low), ITMF[1] is sampled on the
rising edge of HSCLK.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
27
PMC [ PMC-SIERRA, INC ]
