DS21552L+ Maxim Integrated Products, DS21552L+ Datasheet - Page 52

• Manufacturer Part Number: DS21552L+
• Description: IC TXRX T1 1-CHIP 5V 100-LQFP
• Manufacturer: Maxim Integrated Products

Specifications of DS21552L+

• Function: Single-Chip Transceiver
• Interface: E1, HDLC, J1, T1
• Number Of Circuits: 1
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 75mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 100-LQFP
• Includes: DSX-1 and CSU Line Build-Out Generator, HDLC Controller, In-Band Loop Code Generator and Detector
• Product: Framer
• Number Of Transceivers: 1
• Data Rate: 64 Kbps
• Supply Voltage (max): 3.465 V
• Supply Voltage (min): 3.135 V
• Supply Current (max): 75 mA (Typ)
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Ic Interface Type: Parallel, Serial
• Supply Voltage Range: 4.75V To 5.25V
• Operating Temperature Range: 0°C To +70°C
• Digital Ic Case Style: LQFP
• No. Of Pins: 100
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power (watts): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

8.2 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)
CRC/FB11
CRC/FB0
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 the framing bit position
(in the D4 framing mode; CCR2.3=0).
Table 8.2 PATH CODE VIOLATION COUNTING ARRANGEMENTS
CRC/FB7
(note 1)
(MSB)
SYMBOL
FRAMING MODE
(CCR2.3)
CRC/FB6
ESF
D4
D4
(note 1)
POSITION
PCVCR1.3
PCVCR2.0
CRC/FB5
(note 1)
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)
COUNT Fs ERRORS
CRC/FB4
(note 1)
(RCR2.1)
don’t care
yes
no
CRC/FB11
CRC/FB3
52 of 137
CRC/FB10
CRC/FB2
errors in the Ft pattern
errors in both the Ft & Fs patterns
errors in the CRC6 code words
CRC/FB9
CRC/FB1
WHAT IS COUNTED
IN THE PCVCRs
CRC/FB8
CRC/FB0
(LSB)
DS21352/DS21552
PCVCR2
PCVCR1