DS64BR401 Datasheet, PDF (18/30 Pages) National Semiconductor (TI) – Quad Bi-Directional Transceiver with Equalization and De-Emphasis

Address Register Name
0x15
CH1 - CHB1
IDLE RATE Select
Bit (s) Field
7:6 Reserve
5
IDLE auto
4
IDLE select
3:2 Reserve
1
RATE auto
0
RATE select
0x16
CH1 - CHB1
EQ Control
7:6 Reserve
5:0 CH1 IB1 EQ
0x17
CH1 - CHB1
VOD Control
7
Reserve
6:0 CH1 OB1 VOD
0x18
CH1 - CHB1
DE Control
7:0 CH1 OB1 DEM
0x19
CH1 - CHB1
IDLE Threshold
7:4 Reserve
3:0 IDLE threshold
Type
R/W
R/W
R/W
R/W
R/W
Default
0x00
0x20
0x03
0x03
0x00
Description
Set bits to 0.
0: Allow IDLE_sel control in Bit 4
1: Automatic IDLE detect
0: Output is muted (electrical idle)
1: Output is ON (SD is disabled)
Set bits to 0.
0: Allow RATE_sel control in Bit 0
1: Automatic RATE detect
0: 2.5 to 3.2 Gbps
1: 5.0 to 6.4 Gbps
Set bits to 0.
IB1 EQ Control - total of 24 levels
(3 gain stages with 8 settings)
[5]: Enable EQ
[4:3]: Gain Stage Control
[2:0]: Boost Level Control
Pin [EQ0 EQ1] = Register [EN] [GST] [BST] =
Hex Value
FF = 100000 = 20'h = Bypass (Default)
11 = 101010 = 2A'h = 5 dB at 3 GHz
00 = 110000 = 30'h = 9 dB at 3 GHz
0F = 110010 = 32'h = 11.7 dB at 3 GHz
01 = 111001 = 39'h = 14.6 dB at 3 GHz
1F = 110101 = 35'h = 18.4 dB at 3 GHz
10 = 110111 = 37'h = 20 dB at 3 GHz
F0 = 111011 = 3B'h = 21.2 dB at 3 GHz
F1 = 111101 = 3D'h = 28.4 dB at 3 GHz
Set bit to 0.
OB1 VOD Control
03'h = 600 mV (Default)
07'h = 800 mV
0F'h = 1000 mV
1F'h = 1200 mV
3F'h = 1400 mV
OB1 DEM Control
[7]: DEM TYPE (Compatibility = 0 / Enhanced
= 1)
[6:0]: DEM Level Control
Pin [DEM1 DEM0] = Register [TYPE] [Level
Control] = Hex Value
00 = 00000001 = 01'h = 0.0 dB
01 = 00000011 = 03'h = −3.5 dB (Default)
10 = 00000101 = 05'h = −6.0 dB
0F = 10001000 = 88'h = −6.0 dB
01 = 10010000 = 90'h = −9.0 dB
1F = 10100000 = A0'h = −12.0 dB
F0 = 10010000 = 90'h = −9.0 dB
F1 = 10100000 = A0'h = −12.0 dB
FF = 11000000 = C0'h = Reserve
Set bits to 0.
De-assert = [3:2], assert = [1:0]
00 = 110 mV, 70 mV (Default)
01 = 150 mV, 110 mV
10 = 170 mV, 130 mV
11 = 190 mV, 150 mV
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