DS2151 Dallas Semiconducotr, DS2151 Datasheet - Page 23

• Manufacturer Part Number: DS2151
• Description: T1 Single-Chip Transceiver
• Manufacturer: Dallas Semiconducotr

B8ZS mode is set for the receive side via CCR2.2, then B8ZS code words 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)
LINE CODE VIOLATION COUNTING ARRANGEMENTS Table 5-1
5.2 Path Code Violation Count Register (PCVCR)
When the receive side of the DS2151Q is set to operate in the ESF framing mode (CCR2.3=1), PCVCR
will automatically be set as a 12-bit counter that will record errors in the CRC6 code words. When set to
operate in the D4 framing mode (CCR2.3=0), PCVCR will automatically count errors in the Ft framing
bit position. Via the RCR2.1 bit, the DS2151Q can be programmed to also report errors in the Fs framing
bit position. The PCVCR will be disabled during receive loss of synchronization (RLOS=1) conditions.
See Table 5-2 for a detailed description of exactly what errors the PCVCR counts.
PCVCR1: PATH VIOLATION COUNT REGISTER 1 (Address=25 Hex)
PCVCR2: PATH VIOLATION COUNT REGISTER 2 (Address=26 Hex)
NOTES:
1. The upper nibble of the counter at address 25 is used by the Multiframes Out of Sync Count Register.
CRC/FB7
COUNT EXCESSIVE
(MSB)
(note 1)
LCV15
(MSB)
LCV7
(RCR1.7)
0S?
yes
yes
CRC/FB6
no
no
(note 1)
LCV14
LCV6
CRC/FB11
SYMBOL POSITION NAME AND DESCRIPTION
SYMBOL POSITION NAME AND DESCRIPTION
CRC/FB0
LCV15
LCV0
CRC/FB5
(note 1)
LCV13
LCV5
B8ZS ENABLED?
LCVCR1.7
LCVCR2.0
PCVCR1.3
PCVCR2.0
CRC/FB4
(note 1)
(CCR2.2)
LCV12
yes
yes
LCV4
no
no
CRC/FB11
CRC/FB3
MSB of the 16-bit code violation count
LSB of the 16-bit code violation count
MSB of the 12-Bit CRC6 Error or Frame Bit Error
Count (note 2)
LSB of the 12-Bit CRC6 Error or Frame Bit Error Count
(note 2)
23 of 51
LCV11
LCV3
BPVs
BPVs + 16 consecutive 0s
BPVs (B8ZS code words not counted)
BPVs + 8 consecutive 0s
CRC/FB10
CRC/FB2
LCV10
LCV2
WHAT IS COUNTED IN THE
CRC/FB9
CRC/FB1
LCV9
LCV1
LCVCRs
CRC/FB8
CRC/FB0
(LSB)
(LSB)
LCV8
LCV0
PCVCR1
PCVCR2
LCVCR1
LCVCR2
DS2151Q