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Chapter 10: GTP-to-Board Interface
When overriding the control value based on the calibration to an external precision
reference resistor, the process independence is lost. As a consequence, the termination
value has a tolerance of ± 25% given by the resistor tolerance of the semiconductor process.
Table 10-3
Table 10-3: TERMINATION_CTRL Attribute Encoding
206
shows the encoding of the TERMINATION_CTRL attribute.
TERMINATION_CTRL [4:0]
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
1
0
0
0
1
0
0
0
1
1
0
0
1
1
0
1
0
0
0
1
0
0
0
1
0
1
0
1
0
1
0
1
1
0
0
1
1
0
0
1
1
1
0
1
1
1
1
0
0
0
1
0
0
0
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
1
1
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
1
1
0
1
1
1
1
0
1
1
1
0
www.xilinx.com
Nominal
+25% Resistance
Resistance [Ω]
0
103.0
1
97.8
0
93.2
1
88.9
0
85.0
1
81.5
0
78.2
1
75.2
0
72.4
1
69.8
0
67.4
1
65.1
0
63.0
1
61.1
0
59.2
1
57.5
0
55.8
1
54.3
0
52.8
1
51.4
0
50.1
1
48.8
0
47.6
1
46.5
0
45.4
1
44.4
0
43.4
1
42.5
0
41.5
1
40.7
Virtex-5 RocketIO GTP Transceiver User Guide
-25% Resistance
[Ω]
[Ω]
128.8
77.3
122.3
73.4
116.4
69.9
111.1
66.7
106.3
63.8
101.9
61.1
97.8
58.7
94.0
56.4
90.5
54.3
87.3
52.4
84.2
50.5
81.4
48.9
78.8
47.3
76.3
45.8
74.0
44.4
71.8
43.1
69.8
41.9
67.8
40.7
66.0
39.6
64.3
38.6
62.6
37.6
61.0
36.6
59.5
35.7
58.1
34.9
56.8
34.1
55.5
33.3
54.2
32.5
53.1
31.8
51.9
31.2
50.9
30.5
UG196 (v1.3) May 25, 2007
R
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