DS21FF44 Maxim Integrated Products, DS21FF44 Datasheet - Page 52

• 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

E-Bit Counter
E-bit Count Register 1 (EBCR1) is the most significant word and EBCR2 is the least significant word of
a 10-bit counter that records Far End Block Errors (FEBE) as reported in the first bit of frames 13 and 15
on E1 lines running with CRC4 multiframe. These count registers will increment once each time the
received E-bit is set to zero. Since the maximum E-bit 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.
EBCR1: E-BIT COUNT REGISTER 1 (Address = 04 Hex)
EBCR2: E-BIT COUNT REGISTER 2 (Address = 05 Hex)
*The upper 6 bits of EBCR1 at address 04 are the least significant bits of the 12-bit FAS error counter.
FAS Error Counter
FAS Count Register 1 (FASCR1) is the most significant word and FASCR2 is the least significant word
of a 12-bit counter that records word errors in the Frame Alignment Signal in timeslot 0. This counter is
disabled when RLOS is high. FAS errors are not counted when the framer is searching for FAS alignment
and/or synchronization at either the CAS or CRC4 multiframe level. Since the maximum FAS word error
count in a one-second period is 4000, this counter cannot saturate.
FASCR1: FAS ERROR COUNT REGISTER 1 (Address = 02 Hex)
FASCR2: FAS ERROR COUNT REGISTER 2 (Address = 04 Hex)
NOTES:
1) The lower 2 bits of FASCR1 at address 02 are the most significant bits of the 10-bit CRC4 error
2) The lower 2 bits of FASCR2 at address 04 are the most significant bits of the 10-bit E-bit counter.
(MSB)
(MSB)
FAS11
FAS5
EB7
counter.
SYMBOL
SYMBOL
*
FAS11
FAS0
EB9
EB0
FAS10
FAS4
EB6
*
POSITION
POSITION
FASCR1.7
FASCR2.2
EBCR1.1
EBCR2.0
FAS9
FAS3
EB5
*
FAS8
FAS2
EB4
*
MSB of the 10-Bit E-Bit Error Count
LSB of the 10-Bit E-Bit Error Count
MSB of the 12-Bit FAS Error Count
LSB of the 12-Bit FAS Error Count
FAS7
FAS1
EB3
52 of 117
*
NAME AND DESCRIPTION
NAME AND DESCRIPTION
FAS6
FAS0
EB2
*
(Note 2)
(Note 1)
EB9
EB1
(Note 2)
(Note 1)
(LSB)
(LSB)
EB8
EB0
FASCR1
FASCR2
EBCR1
EBCR2