PM7344 S/UNI-MPH
DATA SHEET
PMC-950449
ISSUE 6
MULTI-PHY USER NETWORK INTERFACE
Pin Name
Type
Output
Pin Function
No.
TDN[4]
TDN[3]
TDN[2]
TDN[1]/
47
44
27
24
Transmit Digital Negative Line Pulse (TDN).
This signal is available on the pin when the
S/UNI-MPH is configured to transmit dual-rail
data. The TDN signal can be formatted for
either RZ or NRZ waveforms, and can be
enabled to be updated on the rising or falling
edge of TCLKO. When configured for single-rail
T1 or E1 data, TDN is unused.
TOHO[4]
TOHO[3]
TOHO[2]
TOHO[1]
Transmit Overhead Mask Output (TOHO).
When the S/UNI-MPH is configured to bypass
the T1/E1 transmit framers, this signal indicates
the placeholder bit positions for the framing
overhead in the transmit stream. TOHO may be
connected to an external framer device to
provide a user network interface for arbitrary bit
rates or for the J2 rate (for which TOHO is
specially conditioned to operate with the
Transwitch JT2F framer). The ATM cell stream
can be configured to be byte aligned to TOHO
(in which case the number of TCLKO periods
between active TOHO edges must be divisible
by eight). TOHO may be configured to be active
high or active low, and may be enabled to be
updated on the rising or falling edge of TCLKO.
TCLKI
Input
107 Transmit Clock Input (TCLKI). This signal
provides the transmit direction timing (when the
S/UNI-MPH is not loop timed). The S/UNI-MPH
may be configured to ignore the TCLKI input
and utilize XCLK instead. The default
requirement is for TCLKI to be a 1.544 MHz
clock for T1 or a 2.048 MHz clock for E1. For
arbitrary bit rates, TCLKI must be less than or
equal to 25 MHz.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
23
PMC [ PMC-SIERRA, INC ]
