Rainbow Electronics DS26502 - Manual (Page 15)

DS26502 T1/E1/J1/64KCC BITS Element
15 of 125
4. PIN FUNCTION DESCRIPTION
4.1 Transmit PLL
NAME TYPE FUNCTION
PLL_OUT O
Transmit PLL Output. 1544kHz, 2048kHz, 64kHz, or 6312kHz output from
the internal TX PLL.
TCLK I
Transmit Clock Input. A 64kHz, 1.544MHz, 2.048MHz, or 6312kHz
primary clock. May be selected by the TX PLL mux to provide a clock to the
transmit section.
4.2 Transmit Side
NAME TYPE FUNCTION
TSER I
Transmit Serial Data. Source of transmit data sampled on the falling edge of
the selected transmit clock. In normal operation the selected transmit clock is
output at the TCLKO pin.
TS_8K_4 I/O
TSYNC, 8kHz Sync, 400Hz Sync
T1/E1 Mode: When in “input” mode, a pulse at this pin will establish either
frame or multiframe boundaries for the transmit side. In output mode, the pin
can be programmed to output a frame or multiframe sync pulse useful for
aligning data.
64KCC Mode: When in “input” mode, this pin will establish the boundary for
the 8kHz portion of the Composite Clock or the 400Hz boundary based on the
setting of IOCR1.3. In output mode the pin will indicate the 8kHz or 400Hz
composite clock alignment.
TCLKO O
Transmit Clock Output. In normal operation this output is the selected
transmit clock from the TX_PLL, TCLK pin or the recovered clock (RCLK).
When remote loopback is enabled this pin will output the recovered network
clock.
TPOSO O
Transmit Positive-Data Output. In T1 or E1 mode, updated on the rising
edge of TCLKO with the bipolar data out of the transmit-side formatter. Can
be programmed to source NRZ data via the output-data format (IOCR1.0)
control bit. In 64KCC or 6312 mode this pin will be low.
TNEGO O
Transmit Negative-Data Output. In T1 or E1 mode, updated on the rising
edge of TCLKO with the bipolar data out of the transmit-side formatter. In
64KCC or 6312 mode this pin will be low.