DS2151QNB+ Maxim Integrated, DS2151QNB+ Datasheet - Page 28

• Manufacturer Part Number: DS2151QNB+
• Description: Network Controller & Processor ICs
• Manufacturer: Maxim Integrated

Specifications of DS2151QNB+

• Product: Framer
• Number Of Transceivers: 1
• Data Rate: 2.048 Mbps
• Supply Current (max): 65 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: PLCC-44
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 5 V
• Supply Voltage - Max: 5.25 V
• Supply Voltage - Min: 4.75 V
• Part # Aliases: 90-2151Q+NB0

6.2 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 codewords. 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
PCVCR1: PATH VIOLATION COUNT REGISTER 1 (Address = 25 Hex)
PCVCR2: PATH VIOLATION COUNT REGISTER 2 (Address = 26 Hex)
Note 1: The upper nibble of the counter at address 25 is used by the Multiframes Out of Sync Count Register.
Note 2: PCVCR counts either errors in CRC codewords (in the ESF framing mode; CCR2.3 = 1) or errors in the framing bit position (in the
D4 framing mode; CCR2.3 = 0).
Table 6-2. Path Code Violation Counting Arrangements
CRC/FB7
(Note 1)
(MSB)
FRAMING MODE
Table 6-2
(CCR2.3)
ESF
D4
D4
CRC/FB6
(Note 1)
for a detailed description of exactly what errors the PCVCR counts.
CRC/FB11
SYMBOL POSITION NAME AND DESCRIPTION
CRC/FB0
CRC/FB5
(Note 1)
COUNT FS ERRORS?
Don’t Care
(RCR2.1)
PCVCR1.3
PCVCR2.0
Yes
CRC/FB4
No
(Note 1)
CRC/FB11
CRC/FB3
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)
28 of 60
Errors in the Ft pattern
Errors in both the Ft and Fs patterns
Errors in the CRC6 codewords
WHAT IS COUNTED
IN THE PCVCRs
CRC/FB10
CRC/FB2
CRC/FB9
CRC/FB1
CRC/FB8
CRC/FB0
(LSB)
PCVCR2
PCVCR1