DS80PCI800SQ Datasheet, PDF (14/45 Pages) Texas Instruments – DS80PCI800 2.5 Gbps / 5.0 Gbps / 8.0 Gbps 8 Channel PCI Express Repeater

DS80PCI800
SNLS334E – APRIL 2011 – REVISED MARCH 2012
Table 2. Equalizer Settings (continued)
2
0
R
0000 0001 = 0x01
3.4
5.8
7.9
3
0
Float
0000 0010 = 0x02
4.8
7.7
9.9
4
0
1
0000 0011 = 0x03
5.9
8.9
11.0
5
R
0
0000 0111 = 0x07
7.2
11.2
14.3
6
R
R
0001 0101 = 0x15
6.1
11.4
14.6
7
R
Float
0000 1011 = 0x0B
8.8
13.5
17.0
8
R
1
0000 1111 = 0x0F
10.2
15.0
18.5
9
Float
0
0101 0101 = 0x55
7.5
12.8
18.0
10
Float
R
0001 1111 = 0x1F
11.4
17.4
22.0
11
Float Float
0010 1111 = 0x2F
13.0
19.7
24.4
12
Float
1
0011 1111 = 0x3F
14.2
21.1
25.8
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
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FR4 5 inch 5–mil trace
FR4 5 inch 4–mil trace
FR4 10 inch 5–mil trace
FR4 10 inch 4–mil trace
FR4 15 inch 4–mil trace
FR4 20 inch 4–mil trace
FR4 25 to 30 inch 4–mil trace
FR4 30 inch 4–mil trace
FR4 35 inch 4–mil trace
10m, 30awg cable
10m – 12m cable
Table 3. Output Voltage and De-emphasis Settings
Level
DEMA1
DEMB1
DEMA0
DEMB0
VOD Vp-p
DEM dB
(see note below)
Inner Amplitude
Vp-p
1
0
0
0.8
0
0.8
2
0
R
0.9
0
0.9
3
0
Float
0.9
- 3.5
0.6
4
0
1
1.0
0
1.0
5
R
0
1.0
- 3.5
0.7
6
R
R
1.0
-6
0.5
7
R
Float
1.1
0
1.1
8
R
1
1.1
- 3.5
0.7
9
Float
0
1.1
-6
0.6
10
Float
R
1.2
0
1.2
11
Float
Float
1.2
- 3.5
0.8
12
Float
1
1.2
-6
0.6
13
1
0
1.3
0
1.3
14
1
R
1.3
- 3.5
0.9
15
1
Float
1.3
-6
0.7
16
1
1
1.3
-9
0.5
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).
Suggested Use
FR4 <5 inch 4–mil trace
FR4 <5 inch 4–mil trace
FR4 10 inch 4–mil trace
FR4 <5 inch 4–mil trace
FR4 10 inch 4–mil trace
FR4 15 inch 4–mil trace
FR4 <5 inch 4–mil trace
FR4 10 inch 4–mil trace
FR4 15 inch 4–mil trace
FR4 <5 inch 4–mil trace
FR4 10 inch 4–mil trace
FR4 15 inch 4–mil trace
FR4 <5 inch 4–mil trace
FR4 10 inch 4–mil trace
FR4 15 inch 4–mil trace
FR4 20 inch 4–mil trace
PRSNT#
0
0
RXDET
0
Tie 20kΩ
to GND
SMBus REG
bit[3:2]
00
01
Table 4. RX-Detect Settings
Input Termination
High Impedance
High Impedance
50 Ω
Termination sensed Comments
on output pins
X
Manual RX-Detect, input is high impedance
mode
High Z until receiver
is detected
Auto RX-Detect, outputs test every 12 msec
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
14
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