DS80PCI810 Datasheet, PDF (17/60 Pages) Texas Instruments – Low-Power 8 Gbps 8-Channel Linear Repeater

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DS80PCI810
SNLS493A – OCTOBER 2014 – REVISED JANUARY 2015
Table 4. Equalizer Settings⁽¹⁾⁽²⁾
LEVEL
1
2
3
4
EQA ⁽³⁾
EQB
0
R
F
1
EQUALIZATION BOOST RELATIVE TO DC
EQ – 8 bits[7:0]
dB at
1.5 GHz
xxxx xx00 = 0x00
2.1
xxxx xx01 = 0x01
4.0
xxxx xx10 = 0x02
5.5
xxxx xx11 = 0x03
6.8
dB at
2.5 GHz
2.5
5.1
7.0
8.3
(1) Optimal EQ setting should be determined via simulation and prototype verification.
(2) Equalization boost values are inclusive of package loss.
(3) To program EQ Level 1-4 correctly in Pin Mode, RESERVED3 and AD2 pins must be tied via 1 kΩ resistor to GND.
dB at
4 GHz
2.7
6.4
8.3
9.5
Table 5. Output Voltage Settings⁽¹⁾
LEVEL
--
1
2
3
4
5
6
--
VODA1
VODB1
--
0
0
0
R
F
1
--
VODA0
VODB0
--
0
R
1
F
R
0
--
VOD - 3 bits[2:0]
000'b
001'b
010'b
011'b
100'b
101'b
110'b
111'b
VOD_DB - 3
bits[2:0]
000'b
000'b
000'b
000'b
000'b
000'b
000'b
000'b
VID Vp-p
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
VOD/VID Ratio⁽¹⁾
0.57 ⁽²⁾
0.65
0.71
0.77
0.83
0.90
1.00
1.04^{(2) (3)}
(1) For PCIe operation, it is important to keep the output amplitude and dynamic range as large as possible. When operating in Pin Mode, it
is recommended to use VODA[1:0] = VODB[1:0] = Level 6. In SMBus Mode, it is also recommended to use Level 6 (that is, VOD =
110'b and VOD_DB = 000'b).
(2) These VOD settings are only accessible via SMBus Modes.
(3) VOD = 111'b setting in SMBus Mode is not recommended.
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