PM5363 TUPP+622
TUPP+622
DATASHEET
PMC-1981421
ISSUE 4
SONET/SDH TRIBUTARY UNIT PAYLOAD PROCESSOR FOR 622 MBIT/S
INTERFACES
Pin Name
Type
Pin
Function
No.
The active high generated system clock frame
position (GSCLK_FP) signal aligns the HSCLK
divide by four logic which generates the
GSCLK[1:0] signals when STM-4 (STS-12)
interface mode is selected at the incoming or
outgoing interface (IHSMODEB or OHSMODEB
set low). GSCLK_FP should be set high for one
HSCLK period at an interval of four or multiples
of four HSCLK periods.
GSCLK_FP Input
J1
GSCLK_FP is sampled on the rising edge of
HSCLK.
OTMF[1]
Input
J2
The active high outgoing tributary multiframe #1
(OTMF[1]) signal identifies the first frame of the
tributary multiframe for each AU3, or AU4
administrative unit, or STS-1 synchronous
payload envelope in the outgoing STM-4 or
STM-1 #1 stream.
In outgoing STM-1 (STS-3) interface mode
(OHSMODEB set high), the OTMF[1] identifies
the first frame of the tributary multiframe in the
STM-1 stream on the OD[7:0] bus. OTMF[1] is
selectable to pulse high during the third byte
after J1 of the first STS-1 stream or during the
H4 byte of the path overhead which indicates
that the next frame is the first frame of the
tributary multiframe. Selection between marking
the third byte after each J1 or H4 bytes is
controlled by the corresponding OTMFH4
register bit. Pulses on OTMF[1] are only
effective during the H4 or third byte after each J1
byte positions, as appropriate. OTMF[1] is
ignored at other byte positions. OTMF[1] is
sampled on the rising edge of SCLK.
In outgoing STM-4 (STS-12) interface mode
(OHSMODEB set low), the OTMF[1] identifies
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44
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