DS64BR401_13 Datasheet, PDF (13/36 Pages) Texas Instruments – Quad Bi-Directional Transceiver with Equalization and De-Emphasis

DS64BR401
www.ti.com
SNLS304G – JUNE 2009 – REVISED APRIL 2013
Table 3. Equalization Settings with GST=2 for Pins or SMBus Registers (continued)
EQ1⁽ EQ0^{( EQ Setting}
1)
1) GST[4 BST[2:
:3]
0]
10
111
EQ Gain (dB)
1.5 GHz
3.0 GHz
14.5
22.0
Suggested Use
Table 4. Equalization Settings with GST=3 for Pins or SMBus Registers
EQ1⁽ EQ0^{( EQ Setting}
1)
1) GST[4 BST[2:
:3]
0]
1
0
11
000
11
001
0
F
11
010
11
011
1
F
11
100
11
101
11
110
11
111
EQ Gain (dB)
1.5 GHz
3.0 GHz
7.7
14.6
10.1
18.4
12.2
21.2
14.4
24.4
17.5
28.4
19.4
30.6
20.9
32.1
22.6
33.8
Suggested Use
25” FR4 (4-mil trace) or 6m (30 AWG)
10m (30 AWG)
12m (30 AWG)
(1) F=Float (don't drive pin, each float pin has an internal 50K Ohm resistor to VDD and GND), 1=High, 0=Low
Table 5. De-Emphasis Input Select Pins for A and B ports (3–Level Input)
RATE
0/F
0/F
0/F
0/F
0/F
0/F
0/F
0/F
0/F
1/F
DEM1
(1)
0
0
1
1
0
1
F
F
F
0
DEM0
(1)
0
1
0
1
F
F
0
1
F
0
De-
Emphasis
Level
(typ)
0 dB
-3.5 dB
-2 dB
-6 dB
-3 dB
-9 dB
-11 dB
-6 dB
-8 dB
-12 dB
-13 dB
-9 dB
-10 dB
-12 dB
0 dB
DE Pulse
Width
(typ)
0 ps
330 ps
330 ps
330 ps
330 ps
300 ps
enhanced
300 ps
enhanced
300 ps
enhanced
300 ps
enhanced
300 ps
enhanced
300 ps
enhanced
250 ps
enhanced
250 ps
enhanced
250 ps
enhanced
0 ps
VOD (typical)
Suggested Use
VOD: 600 to 1200 mVp-p
VOD = 1000 mVp-p
VOD = 1200 mVp-p
VOD = 1000 mVp-p
VOD = 1200 mVp-p
VOD = 1000 mVp-p
10 inch FR4 trace or 1 meter (28 AWG)
20 inch FR4 trace or 2 meters (28 AWG)
15 inch FR4 trace or 2 meters (28 AWG)
25 inch FR4 trace or 3 meters (28 AWG)
20 inch FR4 trace or 2 meters (28 AWG)
5 meters (28 AWG)
VOD = 1200 mVp-p
7 meters (28 AWG)
VOD = 1000 mVp-p
5 meters (26 AWG)
VOD = 1200 mVp-p
7 meters (26 AWG)
VOD = 1000 mVp-p
8 meters (24 AWG)
VOD = 1200 mVp-p
9 meters (24 AWG)
VOD = 1000 + 200 mVp-p
8 meters (26 AWG)
VOD = 1200 + 200 mVp-p
9 meters (26 AWG)
VOD: (1000 to 1200) + 200 mVp-p 10 meters (24 AWG)
Reserved, don't use
VOD: 600 to 1200 mVp-p
5 inch FR4 trace or 0.5 meter (28 AWG)
(1) F = Float (don't drive pin), 1 = High and 0 = Low. Enhanced DE pulse width provides de-empahsis on second bit.
When RATE = F (auto rate detection active), the DE level and pulse width settings follow detected rate after exiting IDLE. RATE = 0 is 3
Gbps and RATE = 1 is 6 Gbps. De-emphasis should only be used with VOD = 1000 mVp-p or 1200 mVp-p. VOD less then 1000 mVp-p
is not recommended with de-emphasis. Please refer to VOD1 and VOD0 pin description to set the output differential voltage level.
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