Commit | Line | Data |
---|---|---|
274c27b1 A |
1 | * AC timing parameters of LPDDR2(JESD209-2) memories for a given speed-bin |
2 | ||
3 | Required properties: | |
4 | - compatible : Should be "jedec,lpddr2-timings" | |
5 | - min-freq : minimum DDR clock frequency for the speed-bin. Type is <u32> | |
6 | - max-freq : maximum DDR clock frequency for the speed-bin. Type is <u32> | |
7 | ||
8 | Optional properties: | |
9 | ||
10 | The following properties represent AC timing parameters from the memory | |
11 | data-sheet of the device for a given speed-bin. All these properties are | |
12 | of type <u32> and the default unit is ps (pico seconds). Parameters with | |
13 | a different unit have a suffix indicating the unit such as 'tRAS-max-ns' | |
14 | - tRCD | |
15 | - tWR | |
16 | - tRAS-min | |
17 | - tRRD | |
18 | - tWTR | |
19 | - tXP | |
20 | - tRTP | |
21 | - tDQSCK-max | |
22 | - tFAW | |
23 | - tZQCS | |
24 | - tZQinit | |
25 | - tRPab | |
26 | - tZQCL | |
27 | - tCKESR | |
28 | - tRAS-max-ns | |
29 | - tDQSCK-max-derated | |
30 | ||
31 | Example: | |
32 | ||
33 | timings_elpida_ECB240ABACN_400mhz: lpddr2-timings@0 { | |
34 | compatible = "jedec,lpddr2-timings"; | |
35 | min-freq = <10000000>; | |
36 | max-freq = <400000000>; | |
37 | tRPab = <21000>; | |
38 | tRCD = <18000>; | |
39 | tWR = <15000>; | |
40 | tRAS-min = <42000>; | |
41 | tRRD = <10000>; | |
42 | tWTR = <7500>; | |
43 | tXP = <7500>; | |
44 | tRTP = <7500>; | |
45 | tCKESR = <15000>; | |
46 | tDQSCK-max = <5500>; | |
47 | tFAW = <50000>; | |
48 | tZQCS = <90000>; | |
49 | tZQCL = <360000>; | |
50 | tZQinit = <1000000>; | |
51 | tRAS-max-ns = <70000>; | |
52 | }; |