DS21Q55N Maxim Integrated Products, DS21Q55N Datasheet - Page 156

• Manufacturer Part Number: DS21Q55N
• Description: Framer E1/J1/T1 3.3V 256-Pin BGA
• Manufacturer: Maxim Integrated Products

Specifications of DS21Q55N

• Package: 256BGA
• Number Of Transceivers: 4
• Standard Framing Format: E1|J1|T1
• Maximum Supply Current: 75(Typ) mA
• Minimum Single Supply Voltage: 3.135 V
• Maximum Single Supply Voltage: 3.465 V

Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bits 0, 1/Receive Termination Select (RT0, RT1)
Bits 2, 3/Transmit Termination Select (TT0, TT1)
Bits 4, 5/MCLK Prescaler for T1 Mode
Bits 4, 5/MCLK Prescaler for E1 Mode
Bit 6/CMI Invert (CMII)
Bit 7/CMI Enable (CMIE)
RT1
TT1
0
0
1
1
0
0
1
1
MCLK
MCLK
(MHz)
12.352
16.384
(MHz)
16.384
1.544
3.088
6.176
2.048
4.096
8.192
2.048
4.096
8.192
0 = CMI normal at TTIP and RTIP
1 = invert CMI signal at TTIP and RTIP
0 = disable CMI mode
1 = enable CMI mode
RT0
TT0
CMIE
0
1
0
1
0
1
0
1
7
0
MPS1
MPS1
Internal receive-side termination disabled
Internal receive-side 75Ω enabled
Internal receive-side 100Ω enabled
Internal receive-side 120Ω enabled
Internal transmit-side termination disabled
Internal transmit -side 75Ω enabled
Internal transmit -side 100Ω enabled
Internal transmit -side 120Ω enabled
Internal Transmit-Termination Configuration
Internal Receive-Termination Configuration
0
0
1
1
0
0
1
1
0
0
1
1
CMII
LIC4
Line Interface Control 4
7Bh
6
0
MPS0
MPS0
MPS1
0
1
0
1
0
1
0
1
0
1
0
1
5
0
MPS0
JAMUX
(LIC2.3)
JAMUX
(LIC2.3)
4
0
0
0
0
0
1
1
1
1
0
0
0
0
156 of 237
TT1
0
3
TT0
2
0
RT1
1
0
RT0
0
0