DS2155 datasheet(21/238 Pages) DALLAS

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DS2155

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Signal Description:

Transmit Clock Output

Signal Type:

Output

Buffered clock that is used to clock data through the transmit-side formatter (i.e., either TCLK or RCLKI). This pin

is normally connected to TCLKI.

Signal Name:

TPOSI

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 connecting the LIUC pin high. TPOSI and TNEGI can be connected together in NRZ applications.

Signal Name:

TNEGI

Signal Description:

Transmit Negative-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 TNEGO by connecting the LIUC pin high. TPOSI and TNEGI can be connected together in NRZ applications.

Signal Name:

TCLKI

Signal Description:

Transmit Clock Input

Signal Type:

Input

Line interface transmit clock. Can be internally connected to TCLKO by connecting the LIUC pin high.

4.2 Receive Side

Signal Name:

RLINK

Signal Description:

Receive Link Data

Signal Type:

Output

T1 Mode: Updated with either FDL data (ESF) or Fs bits (D4) or Z bits (ZBTSI) one RCLK before the start of a

frame.

E1 Mode: Updated with the full E1 data stream on the rising edge of RCLK.

Signal Name:

RLCLK

Signal Description:

Receive Link Clock

Signal Type:

Output

T1 Mode: A 4kHz or 2kHz (ZBTSI) clock for the RLINK output.

E1 Mode: A 4kHz to 20kHz clock.

Signal Name:

RCLK

Signal Description:

Receive Clock

Signal Type:

Output

1.544MHz (T1) or 2.048MHz (E1) clock that is used to clock data through the receive-side framer.

Signal Name:

RCHCLK

Signal Description:

Receive Channel Clock

Signal Type:

Output

A 192kHz (T1) or 256kHz (E1) clock that pulses high during the LSB of each channel. Synchronous with RCLK

when the receive-side elastic store is disabled. Synchronous with RSYSCLK when the receive-side elastic store is

enabled. Useful for parallel-to-serial conversion of channel data.

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