Datasheet
DS64BR401
SNLS304G –JUNE 2009–REVISED APRIL 2013
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Table 5. De-Emphasis Input Select Pins for A and B ports (3–Level Input) (continued)
RATE DEM1 DEM0 De-
DE Pulse
(1) (1)
Emphasis
Width VOD (typical) Suggested Use
Level
(typ)
(typ)
1/F 0 1 -3.5 dB 200 ps VOD = 1000 mVp-p 10 inch FR4 trace or 1 meter (28 AWG)
-2 dB 200 ps VOD = 1200 mVp-p 10 inch FR4 trace or 1 meters (28 AWG)
1/F 1 0 -6 dB 200 ps VOD = 1000 mVp-p 20 inch FR4 trace or 2 meters (28 AWG)
-3 dB 200 ps VOD = 1200 mVp-p 15 inch FR4 trace or 1 meters (28 AWG)
1/F 1 1 -9 dB 180 ps VOD = 1000 mVp-p 3 meters (28 AWG)
enhanced
-11 dB 180 ps VOD = 1200 mVp-p 4 meters (28 AWG)
enhanced
1/F 0 F -6 dB 180 ps VOD = 1000 mVp-p 3 meters (26 AWG)
enhanced
-8 dB 180 ps VOD = 1200 mVp-p 4 meters (26 AWG)
enhanced
1/F 1 F -12 dB 180 ps VOD = 1000 mVp-p 5 meters (24 AWG)
enhanced
-13 dB 180 ps VOD = 1200 mVp-p 6 meters (24 AWG)
enhanced
1/F F 0 -9 dB 160 ps VOD = 1000 + 200 mVp-p 5 meters (26 AWG)
enhanced
-10 dB 160 ps VOD = 1200 + 200 mVp-p 6 meters (26 AWG)
enhanced
1/F F 1 -12 dB 160 ps VOD: (1000 to 1200) + 200 mVp-p 7 meters (24 AWG)
enhanced
1/F F F Reserved, don't use
Table 6. Idle Control (3–Level Input)
TXIDLEA/B Function
0 This state is for lossy media, dedicated Idle threshold detect circuit disabled,
output follows input based on EQ settings. Idle state not verified.
Float Float enables automatic idle detection. Idle on the input is passed to the
output. Internal 50KΩ resistors hold TXIDLEA/B pin at a mid level - don't
connect this pin if the automatic idle detect function is desired. This is the
default state. Output in Idle if differential input signal less than value set by
SD_TH pin.
1 Manual override, output in electrical Idle. Differential inputs are ignored.
Table 7. Receiver Electrical Idle Detect Threshold Adjust
SD_TH resistor value (Ω)
(1)
Receiver Electrical Idle Detect Threshold (DIFF p-p)
Float (no resistor required) 130 mV (default condition)
0 225 mV
80k 20 mV
(1) SD_TH resistor value can be set from 0 through 80k ohms to achieve desired idle detect threshold, see Figure 6
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