DS2152LN Maxim Integrated Products, DS2152LN Datasheet - Page 40

• Manufacturer Part Number: DS2152LN
• Description: Network Controller & Processor ICs
• Manufacturer: Maxim Integrated Products

Specifications of DS2152LN

• Product: Framer
• Number Of Transceivers: 1
• Data Rate: 2.048 Mbps
• Supply Voltage (max): 5.25 V
• Supply Voltage (min): 4.75 V
• Supply Current (max): 75 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Package / Case: LQFP-100
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

6 ERROR COUNT REGISTERS
There are a set of three counters in the DS2152 that record bipolar violations, excessive 0s, errors in the
CRC6 codewords, framing bit errors, and number of multiframes that the device is out of receive
synchronization. Each of these three counters is automatically updated on either 1-second boundaries
(CCR3.2 = 0) or every 42ms (CCR3.2 = 1) as determined by the timer in Status Register 2 (SR2.5).
Hence, these registers contain performance data from either the previous second or the previous 42ms.
The user can use the interrupt from the 1-second timer to determine when to read these registers. The user
has a full second (or 42ms) to read the counters before the data is lost. All three counters will saturate at
their respective maximum counts and they will not rollover (note: only the Line Code Violation Count
Register has the potential to overflow but the bit error would have to exceed 10
occur).
6.1 Line Code Violation Count Register (LCVCR)
Line Code Violation Count Register 1 High (LCVCR1) is the most significant word and LCVCR2 is the
least significant word of a 16-bit counter that records code violations (CVs). CVs are defined as Bipolar
Violations (BPVs) or excessive 0s. See
B8ZS mode is set for the receive side via CCR2.2, then B8ZS codewords are not counted. This counter is
always enabled; it is not disabled during receive loss of synchronization (RLOS = 1) conditions.
LCVCR1: LINE CODE VIOLATION COUNT REGISTER 1 (Address = 23 Hex)
LCVCR2: LINE CODE VIOLATION COUNT REGISTER 2 (Address = 24 Hex)
Table 6-1. Line Code Violation Counting Arrangements
(MSB)
EXCESSIVE 0S?
LCV15
LCV7
SYMBOL
(RCR1.7)
LCV15
COUNT
LCV0
Yes
Yes
No
No
LCV14
LCV6
POSITION
LCVCR1.7
LCVCR2.0
ENABLED?
(CCR2.2)
LCV13
LCV5
B8ZS
Yes
Yes
No
No
LCV12
LCV4
NAME AND DESCRIPTION
BPVs
MSB of the 16-bit code violation count.
LSB of the 16-bit code violation count.
BPVs + 16 consecutive 0s
BPVs (B8ZS codewords not counted)
BPVs + 8 consecutive 0s
Table 6-1
WHAT IS COUNTED IN THE
LCV11
LCV3
40 of 97
for details of exactly what the LCVCRs count. If the
LCVCRs
LCV10
LCV2
LCV9
LCV1
LCV8
LCV0
-2
(LSB)
before this would
LCVCR1
LCVCR2