DS33R41 Maxim Integrated Products, DS33R41 Datasheet - Page 77

• Manufacturer Part Number: DS33R41
• Description: Network Controller & Processor ICs Inverse-Multiplexing Ethernet Mapper wit
• Manufacturer: Maxim Integrated Products

10.7.2 Path Code Violation Count Register (TR.PCVCR)
In T1 mode, 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, TR.PCVCR records errors in the CRC6 code words.
When set to operate in the T1 D4 framing mode, TR.PCVCR counts errors in the Ft framing bit position. Through
the TR.ERCNT.2 bit, a framer can be programmed to also report errors in the Fs framing bit position. The
TR.PCVCR is disabled during receive loss-of-synchronization (RLOS = 1) conditions.
errors the TR.PCVCR counts.
Table 10-7. T1 Path Code Violation Counting Arrangements
In E1 mode, 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 (TR.PCVCR1) is the most significant word and TR.PCVCR2 is the least
significant word of a 16-bit counter that records path violations (PVs).
FRAMING MODE
ESF
D4
D4
DS33R41 Inverse-Multiplexing Ethernet Mapper with Quad Integrated T1/E1/J1 Transceivers
COUNT Fs ERRORS?
Don’t Care
Yes
No
Errors in the Ft pattern
Errors in both the Ft and Fs patterns
Errors in the CRC6 code words
77 of 335
IN THE PCVCRs
COUNTED
Table 10-7
shows what