Dc Coupled; Table 4-2: Output Swing Versus Pre-Emphasis (Dc Coupled) - Xilinx RocketIO X User Manual

Output Swing and Emphasis

DC Coupled

When the TX output and RX input of two MGTs are DC coupled, the transmitter sees both
an AC and DC impedance of 25Ω (50Ω||50Ω). The drive/emphasis settings for supported
single-ended output swing (Vos) and pre-emphasis levels (%, dB) when DC coupled are
shown in
used.

Table 4-2: Output Swing versus Pre-Emphasis (DC Coupled)

0 1 2
0
120mV
0%
0.0dB
1
2
3
4
5
T
6
X
E
M
7
P
H
8
L
E
V
9
E
L
10
11
12
13
14
15
RocketIO™ X Transceiver User Guide
UG035 (v1.5) November 22, 2004
Table 4-2. The unused (grey) combinations are not supported and should not be
3 4 5 6
180mV 240mV 300mV 360mV
0% 0% 0% 0%
0.0dB 0.0dB 0.0dB 0.0dB
150mV 210mV 270mV 330mV
40% 29% 22% 18%
2.9dB 2.2dB 1.7dB 1.5dB
120mV 180mV 240mV 300mV
100% 67% 50% 40%
6.0dB 4.4dB 3.5dB 2.9dB
150mV 210mV 270mV
120% 86% 67%
6.8dB 5.4dB 4.4dB
120mV 180mV 240mV
100% 133% 100%
6.0dB 7.4dB 6.0dB
150mV 210mV
200% 143%
9.5dB 7.7dB
120mV 180mV
300% 200%
12.0dB 9.5dB
150mV
280%1
11.6dB
120mV
400%
14.0dB
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TXDOWNLEVEL
7 8 9
420mV 480mV 540mV 600mV
0% 0% 0%
0.0dB 0.0dB 0.0dB 0.0dB
390mV 450mV 510mV 570mV
15% 13% 12%
1.2dB 1.1dB 1.0dB 0.9dB
360mV 420mV 480mV 540mV
33% 29% 25%
2.5dB 2.2dB 1.9dB 1.7dB
330mV 390mV 450mV 510mV
55% 46% 40%
3.8dB 3.3dB 2.9dB 2.6dB
300mV 360mV 420mV 480mV
80% 67% 57%
5.1dB 4.4dB 3.9dB 3.5dB
270mV 330mV 390mV 450mV
111% 91% 77%
6.5dB 5.6dB 5.0dB 4.4dB
240mV 300mV 360mV 420mV
150% 120% 100%
8.0dB 6.8dB 6.0dB 5.4dB
210mV 270mV 330mV
200% 156% 127%
9.5dB 8.1dB 7.1dB
180mV 240mV 300mV
267% 200% 160%
11.3dB 9.5dB 8.3dB
150mV 210mV
360% 257%
13.3dB 11.1dB
120mV 180mV
500% 333%
15.6dB 12.7dB
10 11 12 13
660mV 720mV 780mV
0% 0% 0% 0%
0.0dB 0.0dB 0.0dB
630mV 690mV
11% 10% 9%
0.8dB 0.7dB
600mV 660mV
22% 20% 18%
1.6dB 1.5dB
570mV
35% 32%
2.4dB
540mV
50% 44%
3.2dB
67%
86%
R
14 15
95