ds2156gn Maxim Integrated Products, Inc., ds2156gn Datasheet - Page 85

• Manufacturer Part Number: ds2156gn
• Description: Ds2156, Ds2156l, Ds2156ln T1/e1/j1 Single-chip Transceiver Tdm/utopia Ii Interface
• Manufacturer: Maxim Integrated Products, Inc.

13.2 Path Code Violation Count Register (PCVCR)
13.2.1
The path code violation count register records Ft, Fs, or CRC6 errors in T1 frames. When the receive side
of a framer is set to operate in the T1 ESF framing mode, PCVCR records errors in the CRC6 codewords.
When set to operate in the T1 D4 framing mode, PCVCR counts errors in the Ft framing bit position.
Through the ERCNT.2 bit, a framer can be programmed to also report errors in the Fs framing bit
position. The PCVCR is disabled during receive loss-of-synchronization (RLOS = 1) conditions. Table
13-C shows what errors the PCVCR counts.
Table 13-C. T1 Path Code Violation Counting Arrangements
13.2.2
The path code violation-count register records CRC4 errors. Since the maximum CRC4 count in a one-
second period is 1000, this counter cannot saturate. The counter is disabled during loss-of-sync at either
the FAS or CRC4 level; it continues to count if loss-of-multiframe sync occurs at the CAS level.
Path code violation-count register 1 (PCVCR1) is the most significant word and PCVCR2 is the least
significant word of a 16-bit counter that records path violations (PVs).
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bits 0 to 7/Path Code Violation Counter Bits 8 to 15 (PCVC8 to PCVC15). PCVC15 is the MSB of the 16-bit
path code violation count.
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bits 0 to 7/Path Code Violation Counter Bits 0 to 7 (PCVC0 to PCVC7). PCVC0 is the LSB of the 16-bit path
code violation count.
FRAMING MODE
ESF
D4
D4
T1 Operation
E1 Operation
PCVC7
PCVC15
7
0
7
0
PCVC6
PCVC14
PCVCR1
Path Code Violation Count Register 1
44h
PCVCR2
Path Code Violation Count Register 2
45h
COUNT Fs ERRORS?
6
0
6
0
Don’t Care
PCVC5
Yes
No
PCVC13
5
0
5
0
PCVC4
4
0
PCVC12
Errors in the Ft pattern
Errors in the CRC6 codewords
Errors in both the Ft and Fs patterns
85 of 265
4
0
PCVC3
3
0
PCVC11
IN THE PCVCRs
COUNTED
3
0
PCVC2
2
0
PCVC10
2
0
PCVC1
1
0
PCVC9
1
0
PCVC0
0
0
PCVC8
0
0
DS2156