SXT6051 Pin Assignments And Signal Description
Table 2: Signal Description (Sheet 2 of 11)
Pin #
Name
Type
Description
External References
Internal TX Frame Alignment Output. This signal is syn-
185
186
163
187
MFRMO
O
HiZ-4ma
chronous with the multiplexer frame and is used to synchronize
other transmitters. See Figures 12 and 13.
MFRMI
LOS
I
External TX Frame Alignment Input. An 8 KHz signal used
to align the start of a transmit multiplexer frame. If not needed,
this input is grounded.
TTLin
I
Loss of Signal Input. Input from the Line Interface circuit that
can be used either with a parallel interface or with a serial inter-
face. Active High.
TTLin
MHICLK
I
Multiplexer System Serial Clock. An external STM-0 (51.84
MHz) reference frequency input for the multiplexer and can be
used by the demultiplexer section during Blue Signal /AIS Sig-
nal generation.
TTLin
188
86
MHBCLKI
MMFRMI
I
Multiplexer System Parallel Clock. An external STM-0 (6.48
MHz) or STM-1 (19.44 MHz) reference frequency input for the
multiplexer and can be used by the demultiplexer section dur-
ing Blue Signal /AIS Signal generation.
TTLin
I
External Multiframe Alignment. A 2 KHz input signal (25%
duty cycle) that can be used, in terminal mode only, to reset the
internal H4 byte counter.
TTLin
192
191
113
MMSAJ1EN
MMSAPAYEN
DRETFRMI
O
Test Point For J1 Position on TX framed signal. Provided for
testing purposes.
HiZ-2ma
O
Test point for Payload Enable on TX framed signal. Provided
for testing purposes.
HiZ-2mA
I
Demultiplexer Receive Re-timing Frame. An 8 KHz pulse
synchronous with DRETCLK, used by the receive re-timing
function to synchronize the position of the VC3 or VC4 pay-
load. It is always needed.
TTLin
112
DRETCLK
I
Demultiplexer Receive Re-timing Clock Synchronization. A
parallel clock input at either 6.48 MHz (STM-0) or 19.44 MHz
(STM-1). It is used to generate the clocking for the VC-3 or
VC-4 container on DTBDATA<7:0> when the retiming func-
tion is enabled.
TTLin
Serial Overhead Byte Access
15
16
TSOH
I
Transmit RSOH and MSOH Serial Access. Input for serially
sourced RSOH and MSOH transmit data. The data is clocked
in synchronous to MMSPPCKO at 19.44 MHz for STM-1 and
6.48 MHz for STM-0.
TTLin
TSOHEN
O
Transmit RSOH and MSOH Serial Access Clock Enable.
Used to enable clocking of RSOH and MSOH data at the
TSOH input using MMSPPCKO.
HiZ-4ma
9
LevelOne [ LEVEL ONE ]
