S/UNI-IMA-4 Telecom Standard Product Data Sheet
Released
9.7 Clk/Data (33 signals)
Pin Name
Type
Pin
Function
No.
The Transmit Serial Clock (TSCLK[3:0]) signals contain the
transmit clocks for the 4 independently timed links. The
TSDATA[3:0] signals are updated on the falling edge of the
corresponding TSCLK[3:0] clock.
TSCLK[3]
TSCLK[2]
TSCLK[1]
TSCLK[0]
Input
G1
F4
H1
H3
For channelized T1 or E1 links, TSCLK[n] must be gapped during
the framing bit (for T1 interfaces) or during time-slot 0 (for E1
interfaces) of the TSDATA[n] stream. The S/UNI-IMA-4 uses the
gapping information to determine the time-slot alignment in the
transmit stream.
For unchannelized links, TSCLK[n] must be externally gapped
during the bits or time-slots that are not part of the transmission
format payload (i.e., not part of the ATM Cell).
The TSCLK[3:0] input signal is nominally a 50% duty cycle clock of
1.544 MHz for T1 links and 2.048 MHz for E1 links.
The TSCLK[3:0] may operate at higher rates in the unchannelized
mode. At higher rates, the amount of lines available is limited. See
section 13.3.1 for more details.
The Transmit Serial Data (TSDATA[3:0]) signals contain the
transmit data for the 4 independently timed links. For channelized
links, TSDATA[n] contains the 24 (T1) or 31 (E1) time-slots that
comprise the channelized link. TSCLK[n] must be gapped during the
T1 framing bit position or the E1 frame alignment signal (time-slot
0). The S/UNI-IMA-4 uses the location of the gap to determine the
channel alignment on TSDATA[n].
TSDATA[3]
TSDATA[2]
TSDATA[1]
TSDATA[0]
Output
J4
K2
K1
K4
For unchannelized links, TSDATA[n] contains the ATM cell data. For
certain transmission formats, TSDATA[n] may contain place holder
bits or time-slots. TSCLK[n] must be externally gapped during the
placeholder positions in the TSDATA[n] stream.
The TSDATA[3:0] output signals are updated on the falling edge of
the corresponding TSCLK[3:0] clock, or on the falling edge of the
CTSCLK when the CTSCLK_SEL is set.
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2020889, Issue 2
38
PMC [ PMC-SIERRA, INC ]
