xrt94l33 Exar Corporation, xrt94l33 Datasheet - Page 146

• Manufacturer Part Number: xrt94l33
• Description: Multi-channel, Multi-function Device Aggregates 3 Ds3/e3/sts-1 Into Oc3/stm-1
• Manufacturer: Exar Corporation

XRT94L33
Rev.1.2.0.
Configuring the XRT94L33 to operate in the “1-Channel STS-3c (with 0 to 2-Channel DS3/E3) ATM
UNI/PPP Mode.
To configure the XRT94L33 to operate in this mode execute the following two steps.
STEP 1 - SET BITS 1 AND 0 (CONF[1:0]), WITHIN THE OPERATION CONTROL REGISTER – BYTE 3;
TO [0, 1]; AS DEPICTED BELOW.
Operation Control Register – Byte 3 (Address = 0x0100)
STEP 2 – SET BIT 2 (PPP/ATM*), WITHIN THE “OPERATION CONTROL REGISTER- BYTE 0” TO THE
APPROPRIATE VALUE AS DEPICTED BELOW.
Operation Control Register – Byte 0 (Address = 0x0103)
Setting this bit-field to “0” configures the XRT94L33 to operate in the ATM UNI Mode. Conversely, setting this
bit-field to “1” configures the XRT94L33 to operate in the PPP Mode.
Please refer to Section 4.0 for a description on how to configure the XRT94L33 to operate in the ATM UNI
Mode. Further, please refer to Section 5.0 for a description on how to configure the XRT94L33 to operate in
the PPP Mode.
1.5.2
If the user configures the XRT94L33 to operate in this mode, then the XRT94L33 will function as a 1-Channel
STS-3 ATM UNI/PPP device.
PLL OFF
Transmit
UTOPIA
B
B
R/W
R/W
IT
IT
X
0
7
7
1-C
HANNEL
PLL OFF
UTOPIA
Receive
CH_MODE_SEL[3:0]
B
B
R/W
R/W
IT
IT
X
0
6
6
STS-3 ATM UNI/PPP M
B
B
R/W
R/O
IT
IT
X
0
5
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
5
Unused
B
B
R/W
R/O
ODE
IT
IT
0
X
4
4
146
Dual Bus
B
B
R/O
R/W
IT
0
IT
X
3
3
PPP/ATM*
Unused
B
B
R/W
R/O
IT
IT
X
0
2
2
Unused
B
B
R/W
R/O
IT
0
IT
0
1
1
xr
CONF[1:0]
SW RESET
B
B
R/W
R/W
IT
IT
0
0
0
0