Datasheet

DS21348/DS21Q348

37 of 76

SR (06H): STATUS REGISTER

(MSB)

(LSB)

LUP LDN LOTC RUA1 RCL TCLE TOCD PRBSD

SYMBOL POSITION DESCRIPTION

LUP

(latched)

SR.7 Loop-Up Code Detected. Set when the loop-up code defined in registers

RUPCD1 and RUPCD2 is being received. See Section 4

for details.

LDN

(latched)

SR.6 Loop-Down Code Detected. Set when the loop-down code defined in

registers RDNCD1 and RDNCD2 is being received. See Section 4

for

details.

LOTC

(real time)

SR.5 Loss of Transmit Clock. Set when the TCLK pin has not transitioned for

5µsec (±2µs). Will force the LOTC pin high.

RUA1

(latched)

SR.4 Receive Unframed All Ones. Set when an unframed all ones code is

received at RRING and RTIP. See Table 5-1

for details.

RCL

(latched)

SR.3 Receive Carrier Loss. Set when a receive carrier loss condition exists at

RRING and RTIP. See Table 5-1

for details.

TCLE

(real time)

SR.2 Transmit Current Limit Exceeded. Set when the 50mA (RMS) current

limiter is activated whether the current limiter is enabled or not.

TOCD

(real time)

SR.1 Transmit Open Circuit Detect. Set when the device detects that the TTIP

and TRING outputs are open circuited.

PRBSD

(real time)

SR.0 PRBS Detect. Set when the receive-side detects a 2

- 1 (E1) or a 2

- 1

(T1) Pseudo-Random Bit Sequence (PRBS).