DS80PCI102_15 Datasheet, PDF (14/46 Pages) Texas Instruments – 2.5-Gbps / 5.0-Gbps / 8.0-Gbps 1-Lane PCI-Express Repeater With Equalization and De-Emphasis

DS80PCI102
SNLS344G – JULY 2011 – REVISED AUGUST 2015
www.ti.com
Table 3. Output Voltage and De-Emphasis Settings
LEVEL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
VOD_SEL
0
0
0
0
R
R
R
R
Float
Float
Float
Float
1
1
1
1
DEMA
DEMB
0
R
Float
1
0
R
Float
1
0
R
Float
1
0
R
Float
1
VOD (Vp-p)
0.7
0.7
0.7
0.7
1.2
1.2
1.2
1.2
1.0
1.0
1.0
1.0
1.1
1.1
1.3
1.3
DEM (dB)⁽¹⁾
0
-6
- 3.5
-9
0
-6
- 3.5
-9
0
-6
- 3.5
-9
0
- 1.5
- 1.5
- 3.5
SUGGESTED USE
FR4 < 5 inch 4–mil trace
FR4 12 inch 4–mil trace
FR4 10 inch 4–mil trace
FR4 15 inch 4–mil trace
FR4 < 5 inch 4–mil trace
FR4 12 inch 4–mil trace
FR4 10 inch 4–mil trace
FR4 15 inch 4–mil trace
FR4 < 5 inch 4–mil trace
FR4 15 inch 4–mil trace
FR4 10 inch 4–mil trace
FR4 20 inch 4–mil trace
FR4 < 5 inch 4–mil trace
FR4 5 inch 4–mil trace
FR4 5 inch 4–mil trace
FR4 10 inch 4–mil trace
(1) The VOD output amplitude and DEM de-emphasis levels are set with the DEMA/B[1:0] pins.
The de-emphasis levels are available in GEN1, GEN2, and GEN 3 modes when RATE = Float.
PRSNT ⁽¹⁾
(PIN 52)
0
0
RXDET
(PIN 22)
0
Tie 20 kΩ
to GND
0
Float
(Default)
0
1
1
X
Table 4. RX-Detect Settings
SMBus REG
BIT[3:2]
00
01
10
11
INPUT
TERMINATION
Hi-Z
Pre Detect: Hi-Z
Post Detect: 50 Ω
Pre Detect: Hi-Z
Post Detect: 50 Ω
50 Ω
Hi-Z
COMMENTS
Manual RX-Detect, input is high-impedance mode
Auto RX-Detect, outputs test every 12 ms for 600 ms
then stops; termination is hi-Z until detection; once
detected input termination is 50 Ω
Reset function by pulsing PRSNT high for 5 µs then low
again
Auto RX-Detect, outputs test every 12 ms until detection
occurs; termination is hi-Z until detection; once detected
input termination is 50 Ω
Reset function by pulsing PRSNT high for 5 µs then low
again
Manual RX-Detect, input is 50 Ω
Power-down mode, input is high impedance, output
drivers are disabled
Used to reset RX-Detect State Machine when held high
for 5 µs
(1) In SMBus Slave Mode, the Rx Detect State Machine can be manually reset in software by overriding the device PRSNT function. This is
accomplished by setting the Override RXDET bit (Reg 0x02[7]) and then toggling the RXDET Value bit (Reg 0x02[6]). See Table 10 for
more information about resetting the Rx Detect State Machine.
Table 5. Signal Detect Threshold Level⁽¹⁾
SD_TH
0
R
F (default)
1
SMBus REG BIT [3:2] AND [1:0]
10
01
00
11
ASSERT LEVEL (TYP)
210 mVp-p
160 mVp-p
180 mVp-p
190 mVp-p
(1) VDD = 2.5 V, 25°C, and 0101 pattern at 8 Gbps.
DEASSERT LEVEL (TYP)
150 mVp-p
100 mVp-p
110 mVp-p
130 mVp-p
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