DS21FF44 datasheet(21/117 Pages) MAXIM

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DS21FT44/DS21FF44

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Signal Name:

TLINK

Signal Description:

Transmit Link Data

Signal Type:

Input

If enabled, this pin will be sampled on the falling edge of TCLK for data insertion into any combination

of the Sa bit positions (Sa4 to Sa8). See Section 18 for details. This signal is not bonded out in the

DS21FF44/DS21FT44.

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. This pin can

also be programmed to output either a frame or multiframe pulse. Always synchronous with TCLK.

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 connected low in applications that do not use the

transmit side elastic store. Always synchronous with TSYSCLK.

Signal Name:

TSIG

Signal Description:

Transmit Signaling Input

Signal Type:

Input

When enabled, this input will sample signaling bits for insertion into outgoing PCM E1 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. This function is available when

FMS = 0. FMS is connected to ground for the DS21FF44/DS21FT44.

Signal Name:

TPOS

Signal Description:

Transmit Positive Data Output

Signal Type:

Output

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

programmed to source NRZ data by the Output Data Format (TCR1.7) control bit.

Signal Name:

TNEG

Signal Description:

Transmit Negative Data Output

Signal Type:

Output

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

RECEIVE SIDE PINS

Signal Name:

RLINK

Signal Description:

Receive Link Data

Signal Type:

Output

Updated with full recovered E1 data stream on the rising edge of RCLK. This signal is not bonded out in

the DS21FF44/DS21FT44.

DS21FF44 Datasheet(PDF) 21 Page - Maxim Integrated Products

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