Maxim DS21Q55 specifications PIN Function Description, Transmit Side Pins

Product Preview DS21Q55

3. PIN FUNCTION DESCRIPTION

3.1 Transmit Side Pins

Signal Name:	TCLKx
Signal Description:	Transmit Clock
Signal Type:	Input

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

Signal Name:	TSERx
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:	TCHCLKx
Signal Description:	Transmit Channel Clock
Signal Type:	Output

A 192kHz (T1) or 256kHz (E1) clock that pulses high during the LSB of each channel. Can also be programmed to output a gated transmit-bit clock for fractional T1/E1 applications. Synchronous with TCLK when the transmit -side elastic store is disabled. Synchronous with TSYSCLK when the transmit -side elastic store is enabled. Useful for parallel-to-serial conversion of channel data.

Signal Name:	TCHBLKx
Signal Description:	Transmit Channel Block
Signal Type:	Output

A user-programmable output that can be forced high or low during any of the channels. Synchronous with TCLK when the transmit-side elastic store is disabled. Synchronous with TSYSCLK when the transmit -side elastic store is enabled. Useful for locating individual channels in drop-and-insert applications, for external per-channel loopback, and for per-channel conditioning.

Signal Name:	TSYSCLKx
Signal Description:	Transmit System Clock
Signal Type:	Input

1.544MHz, 2.048MHz, 4.096MHz, 8.192MHz, or 16.384MHz clock. Only used when the transmit -side elastic -store function is enabled. Should be tied low in applications that do not use the transmit -side elastic store. See Interleaved PCM Bus Operation for details on 4.096MHz, 8.192MHz, and 16.384MHz operation using the IBO.

Signal Name:	TLCLKx
Signal Description:	Transmit Link Clock
Signal Type:	Output

Demand clock for the transmit link data [TLINK] input.

T1 Mode: A 4kHz or 2kHz (ZBTSI) clock.

E1 Mode: A 4kHz to 20kHz clock.

Signal Name:	TLINKx
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 either the FDL stream (ESF) or the Fs - bit position (D4) or the Z–bit position (ZBTSI) or any combination of the Sa bit positions (E1).

14 of 248 012103

Please contact telecom.support@dalsemi.com or search http://www.maxim-ic.com for updated

information.