Owner's manual

DS21455/DS21458 Quad T1/E1/J1 Transceivers
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Register Name:
LIC4
Register Description:
Line Interface Control 4
Register Address:
7Bh
Bit # 7 6 5 4 3 2 1 0
Name CMIE CMII MPS1 MPS0 TT1 TT0 RT1 RT0
Default 0 0 0 0 0 0 0 0
Bits 0 to 1/Receive Termination Select (RT0 to RT1).
RT1 RT0
INTERNAL RECEIVE TERMINATION
CONFIGURATION
0 0 Internal Receive-Side Termination Disabled
0 1 Internal Receive-Side 75Ω Enabled
1 0 Internal Receive-Side 100Ω Enabled
1 1 Internal Receive-Side 120Ω Enabled
Bits 2 to 3/Transmit Termination Select (TT0 to TT1).
TT1 TT0
INTERNAL TRANSMIT
TERMINATION CONFIGURATION
0 0 Internal Transmit-Side Termination Disabled
0 1 Internal Transmit-Side 75Ω Enabled
1 0 Internal Transmit-Side 100Ω Enabled
1 1 Internal Transmit-Side 120Ω Enabled
Bits 4 and 5/MCLK Prescaler for T1 Mode.
MCLK
(MHz)
MPS1 MPS0
JAMUX
(LIC2.3)
1.544 0 0 0
3.088 0 1 0
6.176 1 0 0
12.352 1 1 0
2.048 0 0 1
4.096 0 1 1
8.192 1 0 1
16.384 1 1 1
Bits 4 and 5/MCLK Prescaler for E1 Mode.
MCLK
(MHz)
MPS1 MPS0
JAMUX
(LIC2.3)
2.048 0 0 0
4.096 0 1 0
8.192 1 0 0
16.384 1 1 0
Bit 6/CMI Invert (CMII).
0 = CMI normal at TTIP and RTIP
1 = invert CMI signal at TTIP and RTIP
Bit 7/CMI Enable (CMIE).
0 = disable CMI mode
1 = enable CMI mode