DS21Q43-ATN Maxim Integrated Products, DS21Q43-ATN Datasheet - Page 29

• Manufacturer Part Number: DS21Q43-ATN
• Description: IC FRAMER E1 QUAD 5V 128-TQFP
• Manufacturer: Maxim Integrated Products

Specifications of DS21Q43-ATN

• Controller Type: E1 Framer
• Interface: Parallel/Serial
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 32mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 128-TQFP, 128-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

5.1 BPV or Code Violation Counter
Violation Count Register 1 (VCR1) is the most significant word and VCR2 is the least significant word of
a 16-bit counter that records either BiPolar Violations (BPVs) or Code Violations (CVs). If CCR2.6=0,
then the VCR counts bipolar violations. Bipolar violations are defined as consecutive marks of the same
polarity. In this mode, if the HDB3 mode is set for the receive side via CCR1.2, then HDB3 code words
are not counted as BPVs. If CCR2.6=1, then the VCR counts code violations as defined in ITU O.161.
Code violations are defined as consecutive bipolar violations of the same polarity. In most applications,
the DS21Q43A should be programmed to count BPVs when receiving AMI code and to count CVs when
receiving HDB3 code. This counter increments at all times and is not disabled by loss of sync conditions.
The counter saturates at 65,535 and will not rollover. The bit error rate on an E1 line would have to be
greater than 10**-2 before the VCR would saturate.
VCR1: UPPER BIPOLAR VIOLATION COUNT REGISTER 1 (Address=00 Hex)
VCR2: LOWER BIPOLAR VIOLATION COUNT REGISTER 2 (Address=01 Hex)
5.2 CRC4 Error Counter
CRC4 Count Register 1 (CRCCR1) is the most significant word and CRCCR2 is the least significant
word of a 10-bit counter that records word errors in the Cyclic Redundancy Check 4 (CRC4). Since the
maximum CRC4 count in a 1-second period is 1000, this counter cannot saturate. The counter is disabled
during loss of sync at either the FAS or CRC4 level; it will continue to count if loss of multiframe sync
occurs at the CAS level.
CRCCR1: CRC4 COUNT REGISTER 1 (Address=02 Hex)
CRCCR2: CRC4 COUNT REGISTER 2 (Address=03 Hex)
NOTE:
1. The upper 6 bits of CRCCR1 at address 02 are the most significant bits of the 12-bit FAS error
(MSB)
(MSB)
(note 1)
CRC7
V15
counter.
V7
SYMBOL
SYMBOL
CRC9
CRC0
V15
V0
(note 1)
CRC6
V14
V6
POSITION
POSITION
CRCCR1.1
CRCCR2.0
(note 1)
VCR1.7
VCR2.0
CRC5
V13
V5
(note 1)
CRC4
V12
V4
NAME AND DESCRIPTION
MSB of the 16-bit bipolar or code violation count.
LSB of the 16-bit bipolar or code violation count.
NAME AND DESCRIPTION
MSB of the 10-bit CRC4 error count.
LSB of the 10-bit CRC4 error count.
29 of 60
(note 1)
CRC3
V11
V3
(note 1)
CRC2
V10
V2
CRC9
CRC1
V9
V1
CRC8
CRC0
(LSB)
(LSB)
V8
V0
CRCCR1
CRCCR2
DS21Q43A
VCR1
VCR2