PM5345 S/UNI-155
DATA SHEET
PMC-930305
ISSUE 4
SATURN USER NETWORK INTERFACE
Pin Name Type
Pin
No.
Function
FPOUT
Output 10
The active high framing position output
(FPOUT) signal marks the frame alignment on
the POUT[7:0] bus. FPOUT goes high for a
single TCLK period while the first synchronous
payload envelope byte after the three C1 bytes
is present on POUT[7:0]. FPOUT is updated
on the rising edge of TCLK.
LOS
Output 33
The loss of signal (LOS) signal is set high
when loss of signal is declared. This occurs
when a violating period (20 ± 3 µs) of
consecutive all zeros bytes is detected on the
incoming STS-3c(STM-1) signal (before
descrambling). LOS is removed when two
valid framing words (A1, A2) are detected and
during the intervening time, no violating period
of consecutive all zeros patterns is detected.
This alarm indication is also available via
register access. LOS is updated on the falling
edge of RCLK.
LOF
Output 34
The loss of frame (LOF) signal is set high
when loss of frame is declared. This occurs
when an out-of-frame condition (as indicated
by a high level on the OOF output) persists for
a period of 3 ms. LOF is removed when an in-
frame condition (as indicated by a low level on
the OOF output) persists for a period of 3 ms.
This alarm indication is also available via
register access. LOF is updated on the falling
edge of RCLK.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
21
PMC [ PMC-SIERRA, INC ]
