XRT79L71 Datasheet, PDF (91/441 Pages) Exar Corporation – 1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

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PRELIMINARY
1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
XRT79L71
REV. P1.0.3
OPERATION CONTROL REGISTER - BYTE 0 (ADDRESS = 0X0103)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
Transmit
UTOPIA
PLL OFF
Receive
UTOPIA
PLL OFF
Reserved
PPP/ATM*
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
BIT 1
Reserved
R/W
0
BIT 0
Software
RESET*
R/W
0
BIT NUMBER
NAME
7
Transmit UTOPIA PLL
OFF
6
Receive UTOPIA PLL
OFF
5-3
Unused
2
PPP/ATM*
1
Reserved
0
Software RESET
TYPE
R/W
DESCRIPTION
R/W
R/O
R/W PPP/ATM UNI Mode Select:
This READ-WRITE bit-field permits the user to configure the
XRT79L71 device to operate in either the ATM UNI or PPP
Mode.
If Bit 3 (Dual Bus), within the "Operation Control Register - Byte
3" is set to "0", then this bit-field will then dictate the operating
mode of the XRT79L71 device.
0 - Configures the "Dedicated" UTOPIA/POS-PHY bus to oper-
ate in the UTOPIA (ATM) Mode.
1 - Configures the "Dedicated" UTOPIA/POS-PHY Bus to oper-
ate in the POS-PHY Mode.
NOTE: This bit-field is ignored if Bit 3 (Dual-Bus) within the
"Operation Control Register - Byte 3" is set to "1".
R/O
R/W Software RESET:
This READ-WRITE bit-field permits the user to reset the
XRT79L71 device.
0 - Configure the XRT79L71 device into RESET mode.
1 - Normal operation.
DEVICE ID REGISTER (ADDRESS = 0X0104)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
DEVICE_ID_VALUE [7:0]
R/O
R/O
R/O
R/O
R/O
0
1
1
1
1
BIT 2
R/O
0
BIT 1
R/O
1
BIT 0
R/O
0
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