Rainbow Electronics DS21458 - Manual (Page 21)

DS21455/DS21458 Quad T1/E1/J1 Transceivers
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Signal Name:
TSYNC
Signal Description: Transmit Sync
Signal Type: Input/Output
A pulse at this pin will establish either frame or multiframe boundaries for the transmit side. Can be programmed to output
either a frame or multiframe pulse. If this pin is set to output pulses at frame boundaries, it can also be set via IOCR1.3 to
output double-wide pulses at signaling frames in T1 mode.
Signal Name:
TSSYNC
Signal Description: Transmit System Sync
Signal Type: Input
Only used when the transmit-side elastic store is enabled. A pulse at this pin will establish either frame or multiframe
boundaries for the transmit side. Should be tied low in applications that do not use the transmit-side elastic store.
Signal Name:
TSIG
Signal Description: Transmit Signaling Input
Signal Type: Input
When enabled, this input will sample signaling bits for insertion into outgoing PCM data stream. Sampled on the falling edge
of TCLK when the transmit-side elastic store is disabled. Sampled on the falling edge of TSYSCLK when the transmit-side
elastic store is enabled.
Signal Name:
TESO
Signal Description: Transmit Elastic Store-Data Output
Signal Type: Output
Updated on the rising edge of TCLK with data out of the transmit-side elastic store whether the elastic store is enabled or not.
This pin is normally tied to TDATA.
Signal Name:
TDATA
Signal Description: Transmit Data
Signal Type: Input
Sampled on the falling edge of TCLK with data to be clocked through the transmit-side formatter. This pin is normally tied to
TESO.
Signal Name:
TPOSO
Signal Description: Transmit Positive-Data Output
Signal Type: Output
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. This pin is normally tied to TPOSI.
Signal Name:
TNEGO
Signal Description: Transmit Negative-Data Output
Signal Type: Output
Updated on the rising edge of TCLKO with the bipolar data out of the transmit-side formatter. This pin is normally tied to
TNEGI.
Signal Name:
TCLKO
Signal Description: Transmit Clock Output
Signal Type: Output
Buffered clock that is used to clock data through the transmit-side formatter (either TCLK or RCLKI). This pin is normally
tied to TCLKI.
Signal Name:
TPOSI (DS21455 Only)
Signal Description: Transmit Positive-Data Input
Signal Type: Input
Sampled on the falling edge of TCLKI for data to be transmitted out onto the T1 line. Can be internally connected to TPOSO
by tying the LIUC/TPD pin high. See the LIUC/TPD pin description for a full explanation of this function. TPOSI and
TNEGI can be tied together in NRZ applications.