DS21Q42T+ Maxim Integrated Products, DS21Q42T+ Datasheet - Page 46

• Manufacturer Part Number: DS21Q42T+
• Description: IC FRAMER ENHANCED T1 4X 128TQFP
• Manufacturer: Maxim Integrated Products

Specifications of DS21Q42T+

• Controller Type: T1 Framer
• Interface: Parallel/Serial
• Voltage - Supply: 2.97 V ~ 3.63 V
• Current - Supply: 75mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 128-TQFP, 128-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Path Code Violation Count Register
(PCVCR) When the receive side of a framer 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, a framer 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 8-2 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)
(MSB)
(note 1)
CRC/
FB7
NOTES:
1) The upper nibble of the counter at address 25 is used by the Multiframes Out of Sync Count Register.
2) PCVCR counts either errors in CRC code words (in the ESF framing mode; CCR2.3 = 1) or errors in
Table 8-2. PATH CODE VIOLATION COUNTING ARRANGEMENTS
FRAMING MODE
the framing bit position (in the D4 framing mode; CCR2.3 = 0).
CRC/FB11
SYMBOL
CRC/FB0
(CCR2.3)
ESF
D4
D4
(note 1)
CRC/
FB6
(note 1)
CRC/
FB5
POSITION
PCVCR1.3
PCVCR2.0
COUNT Fs ERRORS?
(note 1)
CRC/
FB4
(RCR2.1)
don’t care
yes
no
NAME AND DESCRIPTION
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)
CRC/
FB11
CRC/
FB3
46 of 116
CRC/
FB10
CRC/
FB2
errors in the Ft pattern
errors in both the Ft & Fs patterns
errors in the CRC6 code words
WHAT IS COUNTED IN THE
CRC/
FB9
CRC/
FB1
PCVCRs
(LSB)
CRC/
FB8
CRC/
FB0
PCVCR1
PCVCR2