PMC-Sierra, Inc.
PM5356
S/UNI-622-MAX
DATASHEET
S/UNI-622-MAX
PMC-1980589
ISSUE 5
SATURN USER NETWORK INTERFACE (622-MAX)
9.3
Clocks and Alarms Signals
Pin Name
Type
Pin
No.
Function
RCLK
Output
AC20
The receive clock (RCLK) provides a timing reference for the
S/UNI-622-MAX receive function outputs. RCLK is a 77.76
MHz, 50% duty cycle clock.
RFPO
Output
Output
AB19
The receive frame pulse output (RFPO), when the framing
alignment has been found (the OOF register bit is low), is an 8
kHz signal derived from the receive clock RCLK. RFPO pulses
high for one RCLK cycle every 9720 RCLK cycles (STS-12c /
STM-4-4c).
RFPO is updated on the rising edge of RCLK.
RALRM
AA19
The receive alarm (RALRM) output indicates the state of the
receive framing. RALRM is low if no receive alarms are active.
RALRM is optionally high if line AIS (LAIS), path AIS (PAIS), line
RDI (LRDI), path RDI (PRDI), enhanced path RDI (PERDI), loss
of signal (LOS), loss of frame (LOF), out of frame (OOF), loss of
pointer (LOP), loss of pointer concatenation (LOPC/AISC), loss
of cell delineation (LCD), signal fail BER (SFBER), signal
degrade BER (SDBER), or path signal label mismatch (PSLM) is
detected .
RALRM is an asynchronous output with a minimum period of
one RCLK clock.
TCLK
TFPO
Output
Output
B19
A20
The transmit clock (TCLK) provides timing for the S/UNI-622-
MAX transmit function operation. TCLK is a 77.76 MHz, 50%
duty cycle clock.
The active-high framing position output (TFPO) signal is an 8
kHz signal derived from the transmit clock TCLK. TFPO pulses
high for one TCLK cycle every 9720 RCLK cycles (STS-12c /
STM-4-4c).
TFPO is updated on the rising edge of TCLK.
TFPI
Input
A21
The active high framing position (TFPI) signal is an 8 kHz timing
marker for the transmitter. TFPI is used to align the
SONET/SDH transport frame generated by the S/UNI-622-MAX
device to a system reference. TFPI should be brought high for a
single TCLK period every 9720 TCLK cycles or a multiple
thereof. TFPI must be tied low if such synchronization is not
required.
TFPI is sampled on the rising edge of TCLK.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
21
PMC [ PMC-SIERRA, INC ]
