S/UNI®-JET Data Sheet
Released
Pin Name
Type
Pin
No.
Function
TICLK
Input
V15
The Transmit Input Clock (TICLK) provides the transmit
direction timing. TICLK is the externally generated
transmission system baud rate clock. It is internally
buffered to produce the transmit clock output, TCLK, and
can be enabled to update the TPOS/TDATO and
TNEG/TOHM outputs on the TICLK rising edge. The
TICLK maximum frequency is 52 MHz.
ROHFP
Output
J1
The Receive DS3/E3/J2 Overhead Frame Position
(ROHFP) locates the individual overhead bits in the
received overhead data stream, ROH.
ROHFP is high during the X1 overhead bit position in the
ROH stream when processing a DS3 stream. ROHFP is
high during the first bit of the FA1 byte when processing
a G.832 E3 stream. ROHFP is high during the RAI
overhead bit position when processing a G.751 E3
stream. ROHFP is high during the first bit in Timeslot 97
in the first frame of the 4-frame multiframe when
processing a J2 stream.
ROHFP is updated on the falling edge of ROHCLK.
ROH
Output
Output
J2
The Receive DS3/E3/J2 Overhead Data (ROH) contains
the overhead bits (C, F, X, P, and M) extracted from the
received DS3 stream. It also contains the overhead bytes
(FA1, FA2, EM, TR, MA, NR, and GC) extracted from the
received G.832 E3 stream, the overhead bits (RAI,
National Use, Stuff Indication, and Stuff Opportunity)
extracted from the received G.751 E3 stream, and the
overhead bits (Framing, X , A, M, E ) extracted from
1-3 1-5
the received J2 stream.
ROH is updated on the falling edge of ROHCLK.
ROHCLK
K4
The Receive DS3/E3/J2 Overhead Clock (ROHCLK) is
active when a DS3, E3, or J2 stream is being processed.
ROHCLK is nominally a 526 kHz clock when processing
DS3, a 1.072 MHz clock when processing G.832 E3, a
1.074 MHz clock when processing G.751 E3, and a
gapped 6.312 MHz clock with an average frequency of
168 kHz for J2.
ROH and ROHFP are updated on the falling edge of
ROHCLK.
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-1990267, Issue 3
41
PMC [ PMC-SIERRA, INC ]
