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Ram Timings

This document provides examples of memory timing specifications for various types of DRAM, including SDR SDRAM, DDR SDRAM, DDR2 SDRAM, DDR3 SDRAM, and DDR4 SDRAM. It lists the data rate, clock frequency, CAS latency, and timing for the first, fourth, and eighth word for each memory generation and speed grade in nanoseconds.

Uploaded by

Tushiro K. Himura
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
73 views10 pages

Ram Timings

This document provides examples of memory timing specifications for various types of DRAM, including SDR SDRAM, DDR SDRAM, DDR2 SDRAM, DDR3 SDRAM, and DDR4 SDRAM. It lists the data rate, clock frequency, CAS latency, and timing for the first, fourth, and eighth word for each memory generation and speed grade in nanoseconds.

Uploaded by

Tushiro K. Himura
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Memory timing examples (CAS latency only)

Com CA
Cycl Firs Fou Eig
Gene Bit man e S
Ty Data t rth hth
ratio tim d tim lat wor wor wor
pe rate
n e[1] rate[ e[3] enc d[4] d[5] d[6]
2] y

PC 10. 10. 20. 50. 90.


100 100
10 000 000 2 00 00 00
MT/s MHz
0 ns ns ns ns ns
SDR
AM
PC 7.5 7.5 22. 45. 75.
133 133
13 00 00 3 50 00 00
MT/s MHz
3 ns ns ns ns ns

DD
3.0 6.0 15. 24. 36.
R- 333 166
00 00 2.5 00 00 00
33 MT/s MHz
ns ns ns ns ns
3

15. 22. 32.


3 00 50 50
DDR
ns ns ns
SDR
AM DD
2.5 5.0 12. 20. 30.
R- 400 200
00 00 2.5 50 00 00
40 MT/s MHz
ns ns ns ns ns
0
10. 17. 27.
2 00 50 50
ns ns ns

DDR 20. 27. 37.


2 DD 4 00 50 50
SDR R2 2.5 5.0 ns ns ns
AM - 400 200
00 00
MT/s MHz
40 ns ns 15. 22. 32.
0 3 00 50 50
ns ns ns

DD 533 1.8 266 3.7 4 15. 20. 28.


R2 MT/s 75 MHz 50 00 63 13
- ns ns ns ns ns
11. 16. 24.
53
3 25 88 38
3
ns ns ns

15. 19. 25.


DD 5 00 50 50
R2 1.5 3.0 ns ns ns
667 333
- 00 00
MT/s MHz
66 ns ns 12. 16. 22.
7 4 00 50 50
ns ns ns

15. 18. 23.


6 00 75 75
ns ns ns

12. 16. 21.


DD 5 50 25 25
R2 1.2 2.5 ns ns ns
800 400
- 50 00
MT/s MHz
80 ns ns 11. 15. 20.
0 4.5 25 00 00
ns ns ns

10. 13. 18.


4 00 75 75
ns ns ns

13. 15. 19.


7 13 94 69
ns ns ns

11. 14. 17.


6 25 06 81
ns ns ns
DD
R2 0.9 1.8 12. 15.
1066 533 9.3
- 38 75 5 19 94
MT/s MHz 8 ns
10 ns ns ns ns
66
11. 15.
8.4
4.5 25 00
4 ns
ns ns

10. 14.
7.5
4 31 06
0 ns
ns ns

DDR DD 1066 0.9 533 1.8 7 13. 15. 19.


3 R3
SDR - 38 75 13 94 69
AM 10 MT/s ns MHz ns ns ns ns
66

13. 15. 18.


9 50 75 75
ns ns ns
DD
R3 0.7 1.5 10. 12. 15.
1333 666
- 50 00 7 50 75 75
MT/s MHz
13 ns ns ns ns ns
33
11. 14.
9.0
6 25 25
0 ns
ns ns

DD
R3 0.7 1.4 12.
1375 687 7.2 9.4
- 27 55 5 36
MT/s MHz 7 ns 5 ns
13 ns ns ns
75

13. 15. 18.


11 75 63 13
ns ns ns

12. 14. 16.


10 50 38 88
ns ns ns

11. 13. 15.


DD 9 25 13 63
R3 0.6 1.2 ns ns ns
1600 800
- 25 50
MT/s MHz
16 ns ns 10. 11. 14.
00 8 00 88 38
ns ns ns

10. 13.
8.7
7 63 13
5 ns
ns ns

11.
7.5 9.3
6 88
0 ns 8 ns
ns

DD 1866 0.5 933 1.0 10 10. 12. 14.


R3 36 71 71 32 46
ns ns ns

11. 13.
9.6
- 9 25 39
4 ns
18 MT/s ns MHz ns ns ns
66
10. 12.
8.5
8 18 32
7 ns
ns ns

DD
R3 0.5 1.0 10. 12.
2000 1000 9.0
- 00 00 9 50 50
MT/s MHz 0 ns
20 ns ns ns ns
00

11. 12. 14.


12 25 66 53
ns ns ns

10. 11. 13.


11 31 72 59
ns ns ns

10. 12.
DD 9.3
10 78 66
R3 0.4 0.9 8 ns
2133 1066 ns ns
- 69 38
MT/s MHz
21 ns ns
11.
33 8.4 9.8
9 72
4 ns 4 ns
ns

10.
7.5 8.9
8 78
0 ns 1 ns
ns

6.5 7.9 9.8


7
6 ns 7 ns 4 ns

DD
R3 0.4 0.9
2200 1100 6.3 7.7 9.5
- 55 09 7
MT/s MHz 6 ns 3 ns 5 ns
22 ns ns
00

DD 2400 0.4 1200 0.8 13 10. 12. 13.


R3 MT/s 17 MHz 33 83 08 75
- ns ns ns ns ns
10. 11. 12.
12 00 25 92
ns ns ns

10. 12.
9.1
11 42 08
7 ns
ns ns
24
00
11.
8.3 9.5
10 25
3 ns 8 ns
ns

10.
7.5 8.7
9 42
0 ns 5 ns
ns

11. 12. 13.


15 25 38 88
ns ns ns
DD
R3 0.3 0.7 10. 12.
2666 1333 9.7
- 75 50 13 88 38
MT/s MHz 5 ns
26 ns ns ns ns
66
10. 11.
9.0
12 13 63
0 ns
ns ns

11. 12. 13.


DD 16 43 50 93
R3 0.3 0.7 ns ns ns
2800 1400
- 57 14
MT/s MHz
28 ns ns 11.
8.5 9.6
00 12 07
7 ns 4 ns
ns

DD
R3 0.3 0.6 10.
2933 1466 8.1 9.2
- 41 82 12 57
MT/s MHz 8 ns 0 ns
29 ns ns ns
33

DD
R3 0.3 0.6 10.
3000 1500 8.0 9.0
- 33 67 12 33
MT/s MHz 0 ns 0 ns
30 ns ns ns
00

DD 3100 0.3 1550 0.6 12 7.7 8.7 10.


R3
- 23 45 00
MT/s MHz 4 ns 1 ns
31 ns ns ns
00

DD
R3 0.3 0.6 10. 10. 12.
3200 1600
- 13 25 16 00 94 19
MT/s MHz
32 ns ns ns ns ns
00

DD
R3 0.3 0.6 10. 11.
3300 1650 9.7
- 03 06 16 61 82
MT/s MHz 0 ns
33 ns ns ns ns
00

DDR
4
SDR 15. 16. 19.
AM 12 00 88 38
ns ns ns
DD
R4 0.6 1.2 13. 15. 18.
1600 800
- 25 50 11 75 63 13
MT/s MHz
16 ns ns ns ns ns
00
12. 14. 16.
10 50 38 88
ns ns ns

15. 16. 18.


14 00 61 75
ns ns ns
DD
R4 0.5 1.0 13. 15. 17.
1866 933
- 36 71 13 93 54 68
MT/s MHz
18 ns ns ns ns ns
66
12. 14. 16.
12 86 46 61
ns ns ns

DD 2133 0.4 1066 0.9 15. 16. 18.


R4 MT/s 69 MHz 38 16 00 41 28
- ns ns ns ns ns
21
33 15 14. 15. 17.
06 47 34
ns ns ns

13. 14. 16.


14 13 53 41
ns ns ns

14. 15. 17.


17 17 42 08
ns ns ns
DD
R4 0.4 0.8 13. 14. 16.
2400 1200
- 17 33 16 33 58 25
MT/s MHz
24 ns ns ns ns ns
00
12. 13. 15.
15 50 75 42
ns ns ns

12. 13. 15.


17 75 88 38
ns ns ns

12. 13. 14.


16 00 13 63
ns ns ns
DD
R4 0.3 0.7 11. 12. 13.
2666 1333
- 75 50 15 25 38 88
MT/s MHz
26 ns ns ns ns ns
66
10. 12.
9.7
13 88 38
5 ns
ns ns

10. 11.
9.0
12 13 63
0 ns
ns ns

DD 2800 0.3 1400 0.7 12. 13. 14.


R4 MT/s 57 MHz 14 17 14 21 64
- ns ns ns ns ns
28
00 16 11. 12. 13.
43 50 93
ns ns ns
10. 11. 13.
15 71 79 21
ns ns ns

10. 11. 12.


14 00 07 50
ns ns ns

11. 12. 13.


17 33 33 67
ns ns ns

10. 11. 13.


DD 16 67 67 00
R4 0.3 0.6 ns ns ns
3000 1500
- 33 67
MT/s MHz
30 ns ns 10. 11. 12.
00 15 00 00 33
ns ns ns

10. 11.
9.3
14 33 67
3 ns
ns ns

10. 10. 12.


16 00 94 19
ns ns ns
DD
R4 0.3 0.6 10. 11.
3200 1600 9.3
- 13 25 15 31 56
MT/s MHz 8 ns
32 ns ns ns ns
00
10.
8.7 9.6
14 94
5 ns 9 ns
ns

DD
R4 0.3 0.6 10. 11.
3300 1650 9.7
- 03 06 16 61 82
MT/s MHz 0 ns
33 ns ns ns ns
00

DD
R4 0.3 0.6 10. 11.
3333 1666 9.6
- 00 00 16 50 70
MT/s MHz 0 ns
33 ns ns ns ns
33

DD 3400 0.2 1700 0.5 16 9.4 10. 11.


R4
- 94 88 29 47
MT/s MHz 1 ns
34 ns ns ns ns
00

10. 11. 12.


18 38 25 40
ns ns ns
DD
R4 0.2 0.5 10. 11.
3466 1733 9.8
- 88 77 17 67 83
MT/s MHz 1 ns
34 ns ns ns ns
66
10. 11.
9.2
16 10 25
3 ns
ns ns

10. 10. 11.


18 00 83 94
ns ns ns

10. 11.
9.4
DD 17 28 39
4 ns
R4 0.2 0.5 ns ns
3600 1800
- 78 56
MT/s MHz
36 ns ns 10.
8.8 9.7
00 16 83
9 ns 2 ns
ns

10.
8.3 9.1
15 28
3 ns 7 ns
ns

DD
R4 0.2 0.5 10.
3733 1866 9.1 9.9
- 68 36 17 98
MT/s MHz 1 ns 1 ns
37 ns ns ns
33

DD
R4 0.2 0.5 10. 11.
3866 1933 9.3
- 59 17 18 09 12
MT/s MHz 1 ns
38 ns ns ns ns
66

DD 4000 0.2 2000 0.5 19 9.5 10. 11.


R4 MT/s 50 MHz 00 0 ns 25 25
- ns ns ns ns
40
00

DD
R4 0.2 0.4 10.
4133 2066 9.1 9.9
- 42 84 19 89
MT/s MHz 9 ns 2 ns
41 ns ns ns
33

DD
R4 0.2 0.4 10. 11.
4200 2100 9.5
- 38 76 19 25 25
MT/s MHz 0 ns
42 ns ns ns ns
00

DD
R4 0.2 0.4 10.
4266 2133 8.4 9.1
- 34 69 18 08
MT/s MHz 4 ns 4 ns
42 ns ns ns
66

DD
R4 0.2 0.4
4800 2400 7.9 8.5 9.3
- 08 17 19
MT/s MHz 2 ns 4 ns 8 ns
48 ns ns
00

CA
Com Cycl Firs Fou Eig
Gene Bit S
Ty Data man e t rth hth
ratio tim lat
pe rate d tim wor wor wor
n e enc
rate e d d d
y

Formulas used to

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