Rainbow Electronics DS3170 User Manual
Page 31
DS3170 DS3/E3 Single-Chip Transceiver
31 of 233
PIN NAME
TYPE
PIN DESCRIPTION
TSOFI
I
Transmit Start Of Frame Input
See
TSOFI: This signal can be used to align the start of the DS3 or E3 frames on the
TSER pin to an external signal. In framed modes, the TSOFI signal can be used to
align the start of frame signal position on the TSER/TOH pin to the rising edge of a
signal on this pin. The signal edge does not need to occur on every frame and can be
tied high or low. The signal is sampled on the positive clock edge of the referenced
clock pin if the clock pin signal is not inverted, otherwise it is sampled on the falling
edge of the clock. The signal is typically referenced to the TCLKI transmit clock input
pins, but it can be referenced to the TLCLK, TCLKO, RCLKO and RLCLK clock pins.
This signal can be inverted.
TSER
I
Transmit Serial Data
TSER: When the port framer is configured for either the DS3 or E3 framed modes,
this pin is used as the source of the DS3/E3 payload data. When the port is
configured for a clear channel mode, this pin is used as the source of the DS3/E3
data signal. The signal is sampled on the positive clock edge of the referenced clock
pin if the clock pin signal is not inverted, otherwise it is sampled on the falling edge of
the clock. The signal is typically referenced to the TCLKI transmit clock input pins, but
it can be referenced to the TLCLK, TCLKO / TGCLK, RCLKO and RLCLK clock pins
This signal can be inverted.
o DS3: 44.736 Mbps +20ppm
o E3: 34.368 Mbps +20ppm
TCLKO /
TGCLK
O
Transmit Clock Output / Gapped Clock
See
TCLKO: When TCLKO is selected by
.TCLKS, this clock output is
enabled. This clock is the same clock as the internal framer transmit clock. This clock
is typically used for the reference clock for the TSOFI, TSER, and TSOFO / TDEN
signals but can also be used as the reference for the TPOS / TDAT and TNEG
signals.
This signal can be inverted.
o DS3: 44.736 MHz +20 ppm
o E3: 34.368 MHz +20 ppm
TGCLK: When TGCLK is selected by
.TCLKS, this gated output clock is
enabled. This gapped clock is the same clock as the internal framer transmit clock
and is gated by TDEN. This clock is typically used for the reference clock for the
TSER signal.
This signal can be inverted.