XRT72L71 Datasheet, PDF (92/102 Pages) Exar Corporation – DS3 ATM UNI/CLEAR CHANNEL FRAMER

XRT72L71
DS3 ATM UNI/CLEAR CHANNEL FRAMER
REV. 1.1.0
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REGISTER 106
BIT
FUNCTION
7-6 Unused
5 Handshake Mode
4 M PHY
3 Cell of 52Bytes
2 Tx FIFO Depth(‘1)
1 Tx FIFO Depth(0)
0 UTOPIA Width16
TABLE 107: UTOPIA CONFIGURATION REGISTER
UTOPIA CONFIGURATION REGISTER
HEX ADDRESS: 0X6A
TYPE
RO
DEFAULT
0
DESCRIPTION-OPERATION
R/W
R/W
R/W
R/W
R/W
0: Transmit and Receive UTOPIA Interface blocks operate in the Octet-Level
handshake mode
1: Transmit and Receive UTOPIA Interfaces blocks operate in the Cell-Level
0
handshake mode
NOTE: This bit-field is ignore if the XRT72L71 is configured to operate in the
“Clear-Channel Framer” Mode, or if the chip is configured to operate in the
“Multi-PHY” Mode.
0: Transmit and Receive UTOPIA Interface block operates in the “Single-
PHY” mode
1: Transmit and Receive UTOPIA Interface block operates in the “Multi-PHY”
1
mode
NOTE: This bit-field is only active if the XRT72L71 is configured to operate
in the “ATM UNI” Mode.
0: Transmit and Receive UTOPIA Interface blocks process 53 bytes/cell
when the UTOPIA Data Bus width is set to 8 bits. The Transmit and Receive
UTOPIA Interface blocks process 54 bytes when the UTOPIA Data Bus width
is set to 16 bits.
0
1: Transmit and Receive UTOPIA Interface blocks process 52 bytes/cell,
independent of the UTOPIA Data Bus width.
NOTE: This bit-field is only active if the XRT72L71 is configured to operate
in the “ATM UNI” Mode.
0
00: Operating Depth of Transmit FIFO is 16 cells
01: Operating Depth of Transmit FIFO is 12 cells
10: Operating Depth of Transmit FIFO is 8 cells
0
11: Operating Depth of Transmit FIFO is 4 cells
NOTE: This bit-field is only active if the XRT72L71 is configured to operate
in the “ATM UNI” Mode.
0: Transmit and Receive UTOPIA Data Bus Width is configured to be 8 bits.
1: Transmit and Receive UTOPIA Data Bus Width is configured to be16 bits.
R/W
0
NOTE: This bit-field is only active if the XRT72L71 is configured to operate
in the “ATM UNI” Mode.
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