DS2154 datasheet(27/87 Pages) DALLAS

27 / 87 page

DS2154

27 of 87

FRAMER LOOPBACK

When CCR1.7 is set to a 1, the DS2154 will enter a Framer LoopBack (FLB) mode. See Figure 1-1 for

more details. This loopback is useful in testing and debugging applications. In FLB, the DS2154 will loop

data from the transmit side back to the receive side.

When FLB is enabled, the following will occur:

1. Data will be transmitted as normal at TPOSO and TNEGO.

2. Data input via RPOSI and RNEGI will be ignored.

3. The RCLK output will be replaced with the TCLK input.

CCR2: COMMON CONTROL REGISTER 2 (Address=1A Hex)

(MSB)

(LSB)

ECUS

VCRFS

AAIS

ARA

RSERC

LOTCMC

RFF

RFE

SYMBOL

POSITION

NAME AND DESCRIPTION

ECUS

CCR2.7

Error Counter Update Select. See Section 5 for details.

0=update error counters once a second

1=update error counters every 62.5 ms (500 frames)

VCRFS

CCR2.6

VCR Function Select. See Section 5 for details.

0=count BiPolar Violations (BPVs)

1=count Code Violations (CVs)

AAIS

CCR2.5

Automatic AIS Generation.

0=disabled

1=enabled

ARA

CCR2.4

Automatic Remote Alarm Generation.

0=disabled

1=enabled

RSERC

CCR2.3

RSER Control.

0=allow RSER to output data as received under all conditions

1=force RSER to 1 under loss of frame alignment conditions

LOTCMC

CCR2.2

Loss of Transmit Clock Mux Control. Determines whether the

transmit side formatter should switch to the ever-present

RCLKO if the TCLK should fail to transition (see Figure 1-1).

0=do not switch to RCLKO if TCLK stops

1=switch to RCLKO if TCLK stops

RFF

CCR2.1

Receive Force Freeze. Freezes receive side signaling at RSIG

(and RSER if CCR3.3=1); will override Receive Freeze Enable

(RFE). See Section 7-2 for details.

0=do not force a freeze event

1=force a freeze event

RFE

CCR2.0

Receive Freeze Enable. See Section 7-2 for details.

0=no freezing of receive signaling data will occur

1=allow freezing of receive signaling data at RSIG (and RSER if

CCR3.3=1).

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