DS21FF44 Maxim Integrated Products, DS21FF44 Datasheet - Page 50

• Manufacturer Part Number: DS21FF44
• Description: IC FRAMER E1 4X4 16CH 300-BGA
• Manufacturer: Maxim Integrated Products

Specifications of DS21FF44

• Controller Type: E1 Framer
• Interface: Parallel/Serial
• Voltage - Supply: 2.97 V ~ 3.63 V
• Current - Supply: 300mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 300-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

IMR2: INTERRUPT MASK REGISTER 2 (Address = 17 Hex)
12.
There are a set of four counters in each framer that record bipolar or code violations, errors in the CRC4
SMF code words, E bits as reported by the far end, and word errors in the FAS. Each of these four
counters are automatically updated on either one second boundaries (CCR2.7=0) or every 62.5ms
(CCR2.7=1) as determined by the timer in Status Register 2 (SR2.4). Hence, these registers contain
performance data from either the previous second or the previous 62.5ms. The user can use the interrupt
from the one-second timer to determine when to read these registers. The user has a full second (or 62.5
ms) to read the counters before the data is lost. All four counters will saturate at their respective
maximum counts and they will not rollover.
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 by 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 framer should be programmed to count BPVs when receiving AMI code and to count CVs when
(MSB)
RMF
SYMBOL
RCMF
TSLIP
LOTC
RMF
TMF
RAF
SEC
TAF
ERROR COUNT REGISTERS
RAF
POSITION
IMR2.7
IMR2.6
IMR2.5
IMR2.4
IMR2.3
IMR2.2
IMR2.1
IMR2.0
TMF
Receive CAS Multiframe
0 = interrupt masked
1 = interrupt enabled
Receive Align Frame
0 = interrupt masked
1 = interrupt enabled
Transmit Multiframe
0 = interrupt masked
1 = interrupt enabled
One Second Timer
0 = interrupt masked
1 = interrupt enabled
Transmit Align Frame
0 = interrupt masked
1 = interrupt enabled
Loss Of Transmit Clock
0 = interrupt masked
1 = interrupt enabled
Receive CRC4 Multiframe
0 = interrupt masked
1 = interrupt enabled
Transmit Side Elastic Store Slip Occurrence
0 = interrupt masked
1 = interrupt enabled
SEC
50 of 117
TAF
NAME AND DESCRIPTION
LOTC
RCMF
TSLIP
(LSB)