DS21458 datasheet(21/270 Pages) DALLAS

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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.

DS21458 Datasheet(PDF) 21 Page - Dallas Semiconductor

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