DS26401 datasheet(19/309 Pages) DALLAS

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DS26401 Octal T1/E1/J1 Framer

5.2 Transmit Framer Signals

Signal Name:

TPOS (1–8)

Signal Description:

Transmit Positive Data Output

Signal Type:

Output

Update on the rising edge of TCLK with the bipolar data out of the transmit side formatter. Can be programmed to

source NRZ data via the output data format (TCR3.7) control bit.

Signal Name:

TNEG (1–8)

Signal Description:

Transmit Negative Data Output

Signal Type:

Output

Update on the rising edge of TCLK with the bipolar data out of the transmit side formatter.

Signal Name:

TCLK (1–8)

Signal Description:

Transmit Clock

Signal Type:

Input

A 1.544MHz or a 2.048MHz primary clock. Used to clock data through the transmit side formatter.

Signal Name:

TCLKO (1–8)

Signal Description:

Transmit Clock Output

Signal Type:

Output

This clock is provided to simplify interface to a line interface unit (LIU). This signal is used to register the TPOS and

TNEG outputs and is typically synchronous with the TCLK input. However, in framer and payload loopback

applications this signal becomes synchronous with RCLK.

Signal Name:

TSER (1–8)

Signal Description:

Transmit Serial Data

Signal Type:

Input

Transmit NRZ serial data. 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:

TSIG (1–8)

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:

TSYNC (1–8)

Signal Description:

Transmit Sync

Signal Type:

Input / Output

A pulse at this pin will establish either frame or multiframe boundaries for the transmit side. This signal can also 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 to output doublewide pulses at signaling frames in T1 mode.

Signal Name:

TSSYNC (1–8)

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.

DS26401 Datasheet(PDF) 19 Page - Dallas Semiconductor

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