forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
58 lines
1.2 KiB
58 lines
1.2 KiB
* AC timing parameters of LPDDR3 memories for a given speed-bin. |
|
|
|
The structures are based on LPDDR2 and extended where needed. |
|
|
|
Required properties: |
|
- compatible : Should be "jedec,lpddr3-timings" |
|
- min-freq : minimum DDR clock frequency for the speed-bin. Type is <u32> |
|
- reg : maximum DDR clock frequency for the speed-bin. Type is <u32> |
|
|
|
Optional properties: |
|
|
|
The following properties represent AC timing parameters from the memory |
|
data-sheet of the device for a given speed-bin. All these properties are |
|
of type <u32> and the default unit is ps (pico seconds). |
|
- tRFC |
|
- tRRD |
|
- tRPab |
|
- tRPpb |
|
- tRCD |
|
- tRC |
|
- tRAS |
|
- tWTR |
|
- tWR |
|
- tRTP |
|
- tW2W-C2C |
|
- tR2R-C2C |
|
- tFAW |
|
- tXSR |
|
- tXP |
|
- tCKE |
|
- tCKESR |
|
- tMRD |
|
|
|
Example: |
|
|
|
timings_samsung_K3QF2F20DB_800mhz: lpddr3-timings@800000000 { |
|
compatible = "jedec,lpddr3-timings"; |
|
reg = <800000000>; /* workaround: it shows max-freq */ |
|
min-freq = <100000000>; |
|
tRFC = <65000>; |
|
tRRD = <6000>; |
|
tRPab = <12000>; |
|
tRPpb = <12000>; |
|
tRCD = <10000>; |
|
tRC = <33750>; |
|
tRAS = <23000>; |
|
tWTR = <3750>; |
|
tWR = <7500>; |
|
tRTP = <3750>; |
|
tW2W-C2C = <0>; |
|
tR2R-C2C = <0>; |
|
tFAW = <25000>; |
|
tXSR = <70000>; |
|
tXP = <3750>; |
|
tCKE = <3750>; |
|
tCKESR = <3750>; |
|
tMRD = <7000>; |
|
};
|
|
|