XRT79L71_1 Datasheet, PDF (239/434 Pages) Exar Corporation – 1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC -

REV. 1.0.0
XRT79L71
1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - REGISTER/MAP DESCRIPTION
BIT NUMBER
NAME
3
Receive UTOPIA Parity -
ODD
2-1
0
Unused
Descramble Enable
TYPE
R/W
R/O
DESCRIPTION
Receive UTOPIA Parity Value - ODD Parity:
This READ/WRITE bit-field permits the user to configure the
Receive ATM Cell Processor block to compute either the EVEN
or ODD parity value for each byte (or 16-bit word) within each
cell that it processes. Each of these parity value will ultimately
be output via the RxUPrty output pin (on the Receive UTOPIA
Bus) coincident to when the corresponding byte (of ATM cell
data) is output via the Receive UTOPIA Data Bus (RxU-
Data[15:0]).
0 - Configures the Receive ATM Cell Processor block to com-
pute the EVEN Parity value of each byte (or 16-bit word) of ATM
cell data that it processes.
1 - Configures the Receive ATM Cell Processor block to com-
pute the ODD Parity value of each byte of ATM cell data that is
processes.
De-Scramble Enable:
This READ/WRITE bit-field permits the user to either enable or
disable the Cell De-Scrambler within the Receive ATM Cell Pro-
cessor Block.
0 - Disables the Cell De-Scrambler.
1 - Enables the Cell De-Scrambler.
Receive ATM Cell Processor Block - Receive ATM Status Register (Address = 0x1707)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Unused
PRBS Lock Cell Delineation Status[1:0] LCD Defect
Indicator
Declared
R/O
R/O
R/O
R/O
R/O
R/O
R/O
R/O
0
0
0
0
0
0
0
0
BIT NUMBERS
NAME
7-4
Unused
3
PRBS Lock Indicator
TYPE
R/O
R/O
DESCRIPTION
Test Cell - PRBS Lock Indicator:
This READ-ONLY bit-field indicates whether or not the Test Cell
Receiver is declaring a PRBS Lock condition within the payload
data within the incoming Test Cell data-stream.
0 - Indicates that the Test Cell Receiver is NOT declaring the
PRBS Lock condition.
1 - Indicates that the Test Cell Receiver is currently declaring the
PRBS Lock condition.
NOTE: This bit-field is only valid if the Test Cell Receiver has
been enabled.
230