DS64MB201_13 Datasheet, PDF (12/32 Pages) Texas Instruments – Dual Lane 2:1/1:2 Mux/Buffer with Equalization and De-Emphasis

DS64MB201
SNLS307E – JANUARY 2011 – REVISED JULY 2013
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TXIDLEDO/SO
0
Float
1
Table 4. Idle Control (3–Level Input)
Function
This state is for lossy media, dedicated Idle threshold detect circuit disabled, output follows input based
on EQ settings. Idle state not ensured.
Float enables automatic idle detection. Idle on the input is passed to the output. Internal 50KΩ resistors
hold TXIDLEDO/SO 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.
Manual override, output in electrical Idle. Differential inputs are ignored.
Table 5. 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 7
250
V_DD = 2.5V
T_A = 25°C
200
150
100
50
0
0 10k 20k 30k 40k 50k 60k 70k 80k
SD_TH RESISTOR VALUE (:)
Figure 7. Typical Idle Threshold vs. SD_TH resistor value
12
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