Lattice Semiconductor CertusPro-NX Usage Guide

CertusPro-NX SerDes/PCS Usage Guide
Preliminary Technical Note
FPGA-TN-02245-0.81 © 2020-2021 Lattice Semiconductor 161
All rights reserved. CONFIDENTIAL
Appendix C. Calculating Parameters for SerDes PLL
Table C. 1 lists the recommended parameters for SerDes PLL in specific data rate. For detailed information about PLL
clock setting, refer to PLL Clock Setting section. N need be set as 5, 10 or 20, when 8B/10B PCS is required.
Table C. 1. Recommended Parameters for SerDes PLL
Bit Rate
(Gbps)
Reference Clock
(MHz)
M
F
N
F
VCO
(MHz)
F
bit
(MHz)
F
PMA
(MHz)
Note
0.27
135
8
1
8
8640
1080
135
Actual data rate is 1.08Gbps
0.6144
76.8
8
1
8
4915.2
614.4
76.8
PMA Only
122.88
8
1
5
4915.2
614.4
122.88
Risk for 4915.2MHz F
VCO
1.001
100.1
8
1
10
8008
1001
100.1
—
125.125
1
8
1
8
8008
1001
125.125
PMA Only
1.152
76.8
8
3
5
9216
1152
230.4
—
115.2
8
1
10
9216
1152
115.2
—
144
8
1
8
9216
1152
144
PMA Only
1.188
74.25
8
1
16
9504
1188
74.25
PMA Only
74.25
8
2
8
9504
1188
148.5
PMA Only
79.2
8
3
5
9504
1188
237.6
—
118.8
8
1
10
9504
1188
118.8
—
148.5
8
1
8
9504
1188
148.5
PMA Only
1.2288
76.8
8
1
16
9830.4
1228.8
76.8
PMA Only
76.8
8
2
8
9830.4
1228.8
153.6
PMA Only
81.92
8
3
5
9830.4
1228.8
245.76
—
122.88
8
1
10
9830.4
1228.8
122.88
—
153.6
8
1
8
9830.4
1228.8
153.6
PMA Only
1.25
78.125
8
1
16
10000
1250
78.125
PMA Only
78.125
8
2
8
10000
1250
156.25
PMA Only
83.333
8
3
5
10000
1250
250
—
125
8
1
10
10000
1250
125
—
156.25
8
1
8
10000
1250
156.25
PMA Only
1.485
74.25
4
2
10
5940
1485
148.5
—
74.25
4
4
5
5940
1485
297
—
92.8125
1
4
1
16
5940
1485
92.8125
PMA Only
92.8125
1
4
2
8
5940
1485
185.625
PMA Only
99
4
3
5
5940
1485
297
—
148.5
4
1
10
5940
1485
148.5
—
148.5
4
2
5
5940
1485
297
—
1.5
75
4
4
5
6000
1500
300
—
75
4
2
10
6000
1500
150
—
93.75
4
1
16
6000
1500
93.75
PMA Only
93.75
4
2
8
6000
1500
187.5
PMA Only
100
4
3
5
6000
1500
300
—
150
4
2
5
6000
1500
300
—
150
4
1
10
6000
1500
150
—
1.62
81
4
1
20
6480
1620
81
—
81
4
2
10
6480
1620
162
—
101.25
1
4
1
16
6480
1620
101.25
PMA Only
101.25
1
4
2
8
6480
1620
202.5
PMA Only
108
4
3
5
6480
1620
324
—

Lattice Semiconductor CertusPro-NX Specifications

General

Brand	Lattice Semiconductor
Model	CertusPro-NX
Category	Computer Hardware
Language	English