S/UNI®-JET Data Sheet
Released
Pin Name
Type
Pin
No.
Function
TCELL
The Transmit Cell Indication (TCELL) is valid when the
TCELL bit in the S/UNI-JET Miscellaneous Register is
set.
TCELL pulses once for every cell (idle or assigned)
transmitted. TCELL is updated using timing derived from
the transmit input clock (TICLK), and is active for a
minimum of 8 TICLK periods (or 8 RCLK periods if loop-
timed).
TPOHCLK
Output
Input
U13
The Transmit PLCP Overhead Clock (TPOHCLK) is
active when PLCP processing is enabled. TPOHCLK is
nominally a 26.7 kHz clock for a DS1 PLCP frame, a 768
kHz clock for a DS3 PLCP frame, a 33.7 kHz clock for an
E1 based PLCP frame, and a 576 kHz clock for an G.751
E3 based PLCP frame.
TPOHFP is updated on the falling edge of TPOHCLK.
TPOH and TPOHINS are sampled on the rising edge of
TPOHCLK.
The Transmit Input Overhead Mask (TIOHM) is valid only
if the FRMRONLY bit in the S/UNI-JET Configuration 1
Register is logic zero. TIOHM indicates the position of
overhead bits when not configured for DS1, DS3, E1, E3,
or J2 transmission system streams. TIOHM is delayed
internally to produce the TOHM output.
TIOHM
W15
When configured for operation over a DS1, a DS3, an
E1, an E3, or a J2 transmission system sublayer, TIOHM
is not required, and should be set to logic zero. When
configured for other transmission systems, TIOHM is set
to logic one for each overhead bit position. TIOHM is set
to logic zero if the transmission system does not contain
overhead bits.
TIOHM is sampled on the rising edge of TICLK.
The Framer Transmit Frame Pulse/Multiframe Pulse
(TFPI/TMFPI) is valid when the S/UNI-JET is configured
as a DS3, E3, or J2 framer for non-ATM applications by
setting the FRMRONLY bit in the S/UNI-JET
Configuration 1 Register to logic one.
TFPI indicates the position of all overhead bits in each
DS3 M-subframe, the first bit in each G.751 E3 or G.832
E3 frame, or the first framing bit in each J2 frame. TFPI
is not required to pulse at every frame boundary in E3 or
J2 modes.
TFPI
TMFPI indicates the position of the first bit in each DS3
M-frame, the first bit in each E3 frame, or the first framing
bit in each J2 multiframe. TMFPI is not required to pulse
at every multiframe boundary.
TMFPI
TFPI/TMFPI is sampled on the rising edge of TICLK.
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-1990267, Issue 3
40
PMC [ PMC-SIERRA, INC ]
