DS2152L datasheet(40/97 Pages) MAXIM

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DS2152

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6 ERROR COUNT REGISTERS

There are a set of three counters in the DS2152 that record bipolar violations, excessive 0s, errors in the

CRC6 codewords, framing bit errors, and number of multiframes that the device is out of receive

synchronization. Each of these three counters is automatically updated on either 1-second boundaries

(CCR3.2 = 0) or every 42ms (CCR3.2 = 1) as determined by the timer in Status Register 2 (SR2.5).

Hence, these registers contain performance data from either the previous second or the previous 42ms.

The user can use the interrupt from the 1-second timer to determine when to read these registers. The user

has a full second (or 42ms) to read the counters before the data is lost. All three counters will saturate at

their respective maximum counts and they will not rollover (note: only the Line Code Violation Count

occur).

6.1 Line Code Violation Count Register (LCVCR)

Line Code Violation Count Register 1 High (LCVCR1) is the most significant word and LCVCR2 is the

least significant word of a 16-bit counter that records code violations (CVs). CVs are defined as Bipolar

Violations (BPVs) or excessive 0s. See Table 6-1 for details of exactly what the LCVCRs count. If the

B8ZS mode is set for the receive side via CCR2.2, then B8ZS codewords are not counted. This counter is

always enabled; it is not disabled during receive loss of synchronization (RLOS = 1) conditions.

LCVCR1: LINE CODE VIOLATION COUNT REGISTER 1 (Address = 23 Hex)

LCVCR2: LINE CODE VIOLATION COUNT REGISTER 2 (Address = 24 Hex)

(MSB)

(LSB)

LCV15

LCV14

LCV13

LCV12

LCV11

LCV10

LCV9

LCV8

LCVCR1

LCV7

LCV6

LCV5

LCV4

LCV3

LCV2

LCV1

LCV0

LCVCR2

SYMBOL

POSITION

NAME AND DESCRIPTION

LCV15

LCVCR1.7

MSB of the 16-bit code violation count.

LCV0

LCVCR2.0

LSB of the 16-bit code violation count.

Table 6-1. Line Code Violation Counting Arrangements

COUNT

EXCESSIVE 0S?

(RCR1.7)

B8ZS

ENABLED?

(CCR2.2)

WHAT IS COUNTED IN THE

LCVCRs

BPVs

Yes

BPVs + 16 consecutive 0s

Yes

BPVs (B8ZS codewords not counted)

Yes

BPVs + 8 consecutive 0s

DS2152L Datasheet(PDF) 40 Page - Maxim Integrated Products

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