Datasheet

DS64BR401
www.ti.com SNLS304G –JUNE 2009–REVISED APRIL 2013
Table 3. Equalization Settings with GST=2 for Pins or SMBus Registers (continued)
EQ Setting EQ Gain (dB)
EQ1
(
EQ0
(
Suggested Use
GST[4 BST[2: 1.5 GHz 3.0 GHz
1) 1)
:3] 0]
10 111 14.5 22.0
Table 4. Equalization Settings with GST=3 for Pins or SMBus Registers
EQ Setting EQ Gain (dB)
EQ1
(
EQ0
(
Suggested Use
GST[4 BST[2: 1.5 GHz 3.0 GHz
1) 1)
:3] 0]
1 0 11 000 7.7 14.6 25” FR4 (4-mil trace) or 6m (30 AWG)
11 001 10.1 18.4
0 F 11 010 12.2 21.2 10m (30 AWG)
11 011 14.4 24.4
1 F 11 100 17.5 28.4 12m (30 AWG)
11 101 19.4 30.6
11 110 20.9 32.1
11 111 22.6 33.8
(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 DEM1 DEM0 De-
DE Pulse
(1) (1)
Emphasis
Width VOD (typical) Suggested Use
Level
(typ)
(typ)
0/F 0 0 0 dB 0 ps VOD: 600 to 1200 mVp-p 10 inch FR4 trace or 1 meter (28 AWG)
0/F 0 1 -3.5 dB 330 ps VOD = 1000 mVp-p 20 inch FR4 trace or 2 meters (28 AWG)
-2 dB 330 ps VOD = 1200 mVp-p 15 inch FR4 trace or 2 meters (28 AWG)
0/F 1 0 -6 dB 330 ps VOD = 1000 mVp-p 25 inch FR4 trace or 3 meters (28 AWG)
-3 dB 330 ps VOD = 1200 mVp-p 20 inch FR4 trace or 2 meters (28 AWG)
0/F 1 1 -9 dB 300 ps VOD = 1000 mVp-p 5 meters (28 AWG)
enhanced
-11 dB 300 ps VOD = 1200 mVp-p 7 meters (28 AWG)
enhanced
0/F 0 F -6 dB 300 ps VOD = 1000 mVp-p 5 meters (26 AWG)
enhanced
-8 dB 300 ps VOD = 1200 mVp-p 7 meters (26 AWG)
enhanced
0/F 1 F -12 dB 300 ps VOD = 1000 mVp-p 8 meters (24 AWG)
enhanced
-13 dB 300 ps VOD = 1200 mVp-p 9 meters (24 AWG)
enhanced
0/F F 0 -9 dB 250 ps VOD = 1000 + 200 mVp-p 8 meters (26 AWG)
enhanced
-10 dB 250 ps VOD = 1200 + 200 mVp-p 9 meters (26 AWG)
enhanced
0/F F 1 -12 dB 250 ps VOD: (1000 to 1200) + 200 mVp-p 10 meters (24 AWG)
enhanced
0/F F F Reserved, don't use
1/F 0 0 0 dB 0 ps 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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