Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/sys/contrib/device-tree/Bindings/ddr/lpddr3-timings.txt
48378 views
1
* AC timing parameters of LPDDR3 memories for a given speed-bin.

2


3
The structures are based on LPDDR2 and extended where needed.

4


5
Required properties:

6
- compatible : Should be "jedec,lpddr3-timings"

7
- min-freq : minimum DDR clock frequency for the speed-bin. Type is <u32>

8
- reg : maximum DDR clock frequency for the speed-bin. Type is <u32>

9


10
Optional properties:

11


12
The following properties represent AC timing parameters from the memory

13
data-sheet of the device for a given speed-bin. All these properties are

14
of type <u32> and the default unit is ps (pico seconds).

15
- tRFC

16
- tRRD

17
- tRPab

18
- tRPpb

19
- tRCD

20
- tRC

21
- tRAS

22
- tWTR

23
- tWR

24
- tRTP

25
- tW2W-C2C

26
- tR2R-C2C

27
- tFAW

28
- tXSR

29
- tXP

30
- tCKE

31
- tCKESR

32
- tMRD

33


34
Example:

35


36
timings_samsung_K3QF2F20DB_800mhz: lpddr3-timings@800000000 {

37
	compatible	= "jedec,lpddr3-timings";

38
	reg		= <800000000>; /* workaround: it shows max-freq */

39
	min-freq	= <100000000>;

40
	tRFC		= <65000>;

41
	tRRD		= <6000>;

42
	tRPab		= <12000>;

43
	tRPpb		= <12000>;

44
	tRCD		= <10000>;

45
	tRC		= <33750>;

46
	tRAS		= <23000>;

47
	tWTR		= <3750>;

48
	tWR		= <7500>;

49
	tRTP		= <3750>;

50
	tW2W-C2C	= <0>;

51
	tR2R-C2C	= <0>;

52
	tFAW		= <25000>;

53
	tXSR		= <70000>;

54
	tXP		= <3750>;

55
	tCKE		= <3750>;

56
	tCKESR		= <3750>;

57
	tMRD		= <7000>;

58
};

59


60