ds26519 Maxim Integrated Products, Inc., ds26519 Datasheet - Page 258

• Manufacturer Part Number: ds26519
• Description: Ds26519 16-port T1/e1/j1 Transceiver
• Manufacturer: Maxim Integrated Products, Inc.

Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bit 7: Receive External Resistor On (REXTON)
Bits 2 to 0: Receive Impedance Selection (RIMPM[2:0]). These bits are used to select the receive impedance
termination. They must be set according to the cable impedance even if internal termination resistance is disabled
(RIMPON = 0). See
Note: For the DS26519, fully internal termination is not supported (package power dissipation issue).
Table 10-22. Receive Impedance Selection
Bit 6: Receive Internal Impedance Match On (RIMPON)
RIMPON
0
0
0
0
1
1
1
1
1
1
1
1
0 =
1 =
0 =
1 =
RTIPn and RTIPEn are not connected (high impedance to the line) (if RIMPON is disabled).
RTIPn and RTIPEn are connected.
Receive internal impedance termination is disabled (high impedance).
Receive internal impedance termination is enabled.
REXTON
7
0
RIMPRM[2:0]
Table
000
001
010
011
100
101
110
111
x00
x01
x10
x11
LRISMR
LIU Receive Impedance and Sensitivity Monitor Register
1007h + (20h x (n - 1)) + (2000h x [(n - 1) / 8]): where n = 1 to 16
10-22.
RIMPON
6
0
100 Ω external termination (no internal impedance match)
110 Ω external termination (no internal impedance match)
120 Ω external termination (no internal impedance match)
75 Ω external termination (no internal impedance match)
—
5
0
RECEIVE IMPEDANCE SELECTED ( Ω )
258 of 310
100 Ω , with external 120 Ω resistor
110 Ω , with external 120 Ω resistor
120 Ω , with external 120 Ω resistor
75 Ω , with external 120 Ω resistor
—
4
0
Reserved
Reserved
Reserved
Reserved
—
3
0
DS26519 16-Port T1/E1/J1 Transceiver
RIMPM2
2
0
RIMPM1
1
0
RIMPM0
0
0