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12.5.2 Receive Side Line Encoder/Decoder Register Map

The receive side utilizes six registers.

Table 12-16. Receive Side B3ZS/HDB3 Line Encoder/Decoder Register Map

Address

(0,2,4,6)90h

LINE.RCR

Line Receive Control Register

(0,2,4,6)92h

Unused

(0,2,4,6)94h

LINE.RSR

Line Receive Status Register

(0,2,4,6)96h

LINE.RSRL

Line Receive Status Register Latched

(0,2,4,6)98h

LINE.RSRIE

Line Receive Status Register Interrupt Enable

(0,2,4,6)9Ah

Unused

(0,2,4,6)9Ch LINE.RBPVCR

Line Receive Bipolar Violation Count Register

(0,2,4,6)9Eh LINE.REXZCR

Line Receive Excessive Zero Count Register

12.5.2.1 Register Bit Descriptions

LINE.RCR

Line Receive Control Register

(0.2.4.6)90h

Bit #

Name

Default

Bit #

Name

E3CVE

REZSF

RDZSF

RZSD

Default

Bit 2: E3 Code Violation Enable (E3CVE) – When 0, the bipolar violation count will be a count of bipolar

violations. When 1, the bipolar violation count will be a count of E3 line coding violations. Note: E3 line coding

violations are defined as consecutive bipolar violations of the same polarity in ITU O.161. This bit is ignored in

B3ZS mode.

Bit 2: Receive BPV Error Detection Zero Suppression Code Format (REZSF) – When 0, BPV error detection

detects a B3ZS signature if a zero is followed by a bipolar violation (BPV), and an HDB3 signature if two zeros are

followed by a BPV. When 1, BPV error detection detects a B3ZS signature if a zero is followed by a BPV that has

the opposite polarity of the BPV in the previous B3ZS signature, and an HDB3 signature if two zeros are followed

by a BPV that has the opposite polarity of the BPV in the previous HDB3 signature. Note: Immediately after a reset,

this bit is ignored. The first B3ZS signature is defined as a zero followed by a BPV, and the first HDB3 signature is

defined as two zeros followed by a BPV. All subsequent B3ZS/HDB3 signatures will be determined by the setting of

this bit.

Note: The default setting (REZSF = 0) conforms to ITU O.162. The default setting may falsely decode actual BPVs

that are not codewords. It is recommended that REZSF be set to one for most applications. This setting is more

robust to accurately detect codewords.

Bit 1: Receive Zero Suppression Decoding Zero Suppression Code Format (RDZSF) – When 0, zero

suppression decoding detects a B3ZS signature if a zero is followed by a bipolar violation (BPV), and an HDB3

signature if two zeros are followed by a BPV. When 1, zero suppression decoding detects a B3ZS signature if a

zero is followed by a BPV that has the opposite polarity of the BPV in the previous B3ZS signature, and an HDB3

signature if two zeros are followed by a BPV that has the opposite polarity of the BPV in the previous HDB3

signature. Note: Immediately after a reset (

DRST or RST low), this bit is ignored. The first B3ZS signature is defined

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