DS21FF44 Maxim Integrated Products, DS21FF44 Datasheet - Page 101

• 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

Figure 22-14. DS21Q44 FRAMER SYNCHRONIZATION FLOWCHART
RCR1.0 = 0
RLOS = 1
Resync if
Increment CRC4
Sync Counter;
CRC4SA = 0
CRC4 Resync
CAS Resync
Criteria Met;
Set CASRC
Criteria Met
(RIR.2)
Set FASRC
(RIR.0)
(RIR.1)
CRC4 Word Errors
FAS Resync
Criteria Met
Time
Check for >=915
8ms
Out
Out of 1000
Check for CAS
MF Word Error
CRC4 Multiframe Search
(if enabled via CCR1.0)
CRC4 Sync Criteria
Met; CRC4SA = 0;
(depends on RCR1.2)
Sync Counter
Reset CRC4
CRC4SA = 1
Check for FAS
Framing Error
101 of 117
If CRC4 is on
(CCR1.0 = 1)
(CCR1.3 = 0)
If CAS is on
Sync Declared
FAS Search
Criteria Met
FASSA = 1
FASSA = 0
RLOS = 1
Power Up
RLOS = 0
FAS Sync
CAS Multiframe Search
(if enabled via CCR1.3)
Criteria Met
CASSA = 0
CAS Sync
CASSA = 1