ds3171n Maxim Integrated Products, Inc., ds3171n Datasheet - Page 136
ds3171n
Manufacturer Part Number
ds3171n
Description
Ds3171, Ds3172, Ds3173, Ds3174 Single/dual/triple/quad Ds3/e3 Single-chip Transceivers
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.DS3171N.pdf
(234 pages)
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bit must be set high for a minimum of 100ns and then set back low. This software bit is logically ORed with the
inverted hardware signal RST and the GL.CR1.RST bit.
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bit #
Name
Default
Bit 15: Transmit Line IO Signal Enable (TLEN). This bit is used to enable to transmit line interface output pins
TLCLKn, TPOSn/TDATn and TNEGn.
Bit 14: Transmit LIU Tri-State (TTS) This bit is used to tri-state the transmit TXPn and TXNn pins. The LIU is still
powered up when the pins are tri-stated. It has no effect when the LIU is disabled and powered down.
Bit 13: Receive LIU Monitor Mode (RMON) This bit is used to enable the receive LIU monitor mode pre-amplifier.
Enabling the pre-amplifier adds about 20 dB of linear amplification for use in monitor applications where the signal
has been reduced 20 dB using resistive attenuator circuits.
Bit 12: Transmit LIU LBO (TLBO) This bit is used enable the transmit LBO circuit which causes the transmit
signal to have a wave shape that approximates about 225 feet of cable. This is used to reduce near end crosstalk
when the cable lengths are short. This signal is only valid in DS3 LIU mode.
Bits 10 to 8: Port Interface Mode (LM[2:0]). The LM[2:0] bits select main port interface operational modes. The
default state disables the LIU and the JA. See Table 10-26.
Bits 5 to 3: Framing Mode (FM[2:0]). The FM[2:0] bits select main framing operational modes. Default: DS3 C-bit.
See
Table
0 = Normal operation
1 = Force all internal registers to their default values
0 = Disable, force outputs low
1 = Enable normal operation
0 = TXPn and TXNn driven
1 = TXPn and TXNn tri-stated
0 = Disable the 20 dB pre-amp
1 = Enable the 20 dB pre-amp
0 = TXPn and TXNn have full amplitude signals
1 = TXPn and TXNn signals approximate 225 feet of cable
10-25.
RESERVED
TLEN
15
0
7
0
RESERVED
TTS
14
0
6
0
PORT.CR2
Port Control Register 2
(0,2,4,6)42h
RMON
FM2
13
0
5
0
TLBO
FM1
12
0
0
4
136
RESERVED
FM0
11
0
3
0
RESERVED
LM2
10
0
2
0
RESERVED
LM1
9
0
1
0
RESERVED
LM0
8
0
0
0
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