Datasheet

DS80PCI800
SNLS334E –APRIL 2011–REVISED MARCH 2012 www.ti.com
Table 2. Equalizer Settings (continued)
2 0 R 0000 0001 = 0x01 3.4 5.8 7.9 FR4 5 inch 5–mil trace
3 0 Float 0000 0010 = 0x02 4.8 7.7 9.9 FR4 5 inch 4–mil trace
4 0 1 0000 0011 = 0x03 5.9 8.9 11.0 FR4 10 inch 5–mil trace
5 R 0 0000 0111 = 0x07 7.2 11.2 14.3 FR4 10 inch 4–mil trace
6 R R 0001 0101 = 0x15 6.1 11.4 14.6 FR4 15 inch 4–mil trace
7 R Float 0000 1011 = 0x0B 8.8 13.5 17.0 FR4 20 inch 4–mil trace
8 R 1 0000 1111 = 0x0F 10.2 15.0 18.5 FR4 25 to 30 inch 4–mil trace
9 Float 0 0101 0101 = 0x55 7.5 12.8 18.0 FR4 30 inch 4–mil trace
10 Float R 0001 1111 = 0x1F 11.4 17.4 22.0 FR4 35 inch 4–mil trace
11 Float Float 0010 1111 = 0x2F 13.0 19.7 24.4 10m, 30awg cable
12 Float 1 0011 1111 = 0x3F 14.2 21.1 25.8 10m – 12m cable
13 1 0 1010 1010 = 0xAA 13.8 21.7 27.4
14 1 R 0111 1111 = 0x7F 15.6 23.5 29.0
15 1 Float 1011 1111 = 0xBF 17.2 25.8 31.4
16 1 1 1111 1111 = 0xFF 18.4 27.3 32.7
Table 3. Output Voltage and De-emphasis Settings
Level DEMA1 DEMA0 VOD Vp-p DEM dB Inner Amplitude Suggested Use
DEMB1 DEMB0 (see note below) Vp-p
1 0 0 0.8 0 0.8 FR4 <5 inch 4–mil trace
2 0 R 0.9 0 0.9 FR4 <5 inch 4–mil trace
3 0 Float 0.9 - 3.5 0.6 FR4 10 inch 4–mil trace
4 0 1 1.0 0 1.0 FR4 <5 inch 4–mil trace
5 R 0 1.0 - 3.5 0.7 FR4 10 inch 4–mil trace
6 R R 1.0 - 6 0.5 FR4 15 inch 4–mil trace
7 R Float 1.1 0 1.1 FR4 <5 inch 4–mil trace
8 R 1 1.1 - 3.5 0.7 FR4 10 inch 4–mil trace
9 Float 0 1.1 - 6 0.6 FR4 15 inch 4–mil trace
10 Float R 1.2 0 1.2 FR4 <5 inch 4–mil trace
11 Float Float 1.2 - 3.5 0.8 FR4 10 inch 4–mil trace
12 Float 1 1.2 - 6 0.6 FR4 15 inch 4–mil trace
13 1 0 1.3 0 1.3 FR4 <5 inch 4–mil trace
14 1 R 1.3 - 3.5 0.9 FR4 10 inch 4–mil trace
15 1 Float 1.3 - 6 0.7 FR4 15 inch 4–mil trace
16 1 1 1.3 - 9 0.5 FR4 20 inch 4–mil trace
Note: The VOD output amplitude and DEM de-emphasis levels are set with the DEMA/B[1:0] pins.
The de-emphasis levels are also available in GEN 3 mode when RATE = 1 (tied to VDD).
Table 4. RX-Detect Settings
PRSNT# RXDET SMBus REG Input Termination Termination sensed Comments
bit[3:2] on output pins
0 0 00 High Impedance X Manual RX-Detect, input is high impedance
mode
0 Tie 20kΩ 01 High Impedance High Z until receiver Auto RX-Detect, outputs test every 12 msec
to GND 50 Ω is detected for 600 msec then stops; termination is high-z
until detection; once detected input termination
is 50 Ω
Reset function by pulsing PRSNT# high for 5
usec then low again
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