XRT79L71 Datasheet, PDF (139/441 Pages) Exar Corporation – 1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

áç
PRELIMINARY
1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
XRT79L71
REV. P1.0.3
RXDS3 SYNC DETECT REGISTER (DIRECT ADDRESS = 0X1114)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Unused
P-Bit Correct F Algorithm One and Only
R/O
R/O
R/O
R/O
R/O
R/W
R/W
R/W
0
0
0
0
0
0
0
0
BIT NUMBER
NAME
7-3
Unused
2
P-Bit Correct
1
F Algorithm
0
One and Only
TYPE
R/O
R/W
R/W
R/W
DESCRIPTION
P-Bit Correct:
This READ/WRITE bit-field permits the user to enable or disable
the "P-Bit Correct" feature within the DS3 Frame Synchronizer
block. If the user enables this feature, then the DS3 Frame Syn-
chronizer will automatically invert the state of any P-bits, when-
ever it detects "P-bit errors".
0 - Disables the "P-Bit Correct" feature.
1 - Enables the "P-Bit Correct" feature
F-Bit Search Algorithm Select:
This READ/WRITE bit-field permits the user to select the "F-bit
acquisition" criteria, when the Frame Synchronizer block is oper-
ating in the "F-Bit Search" state.
0 - Frame Synchronizer will move on to the "M-Bit Search" state,
when it has properly located 10 consecutive F-bits.
1 - Frame Synchronizer will move on to the "M-Bit Search" state,
when it has properly located 16 consecutive F-bits.
F-Bit Search/Mimic-Handling Algorithm Select:
This READ/WRITE bit-field permits the user to select the "F-bit
acquisition" criteria, when the Frame Synchronizer block is oper-
ating in the "F-Bit Search" state.
0 - Frame Synchronizer will move on to the "M-Bit Search" state,
when it has properly located 10 (or 16) consecutive F-bits (as
configured in Bit 1 of this register).
1 - Frame Synchronizer will move on to the "M-Bit Search" state,
when (1) it has properly located 10 (or 16) consecutive F-bits;
and (2) when it has located and identified only one viable "F-Bit
Alignment" candidate.
NOTE: If this bit is set to "1", then the Frame Synchronizer block
will NOT transition into the "M-Bit Search" state, as long
as at least two viable candidate set of bits appear to
function as the F-bits.
127