DS21352 datasheet(16/137 Pages) DALLAS

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DS21352/DS21552

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4.1.1 TRANSMIT SIDE PINS (cont.)

Signal Name:

TLINK

Signal Description:

Transmit Link Data

Signal Type:

Input

If enabled via TCR1.2, this pin will be sampled on the falling edge of TCLK for data insertion into either the FDL stream

(ESF) or the Fs–bit position (D4) or the Z–bit position (ZBTSI). See Section 15 for details.

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. Via TCR2.2, the DS21352/552

can be programmed to output either a frame or multiframe pulse at this pin. If this pin is set to output pulses at frame

boundaries, it can also be set via TCR2.4 to output double–wide pulses at signaling frames. See Section 20 for details.

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 T1 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 (CCR1.6) control bit. This pin is normally tied to TPOSI.

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