Rainbow Electronics DS21458 User Manual
Page 169
DS21455/DS21458 Quad T1/E1/J1 Transceivers
169 of 270
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