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52 lines
1.2 KiB
52 lines
1.2 KiB
* AC timing parameters of LPDDR2(JESD209-2) memories for a given speed-bin |
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Required properties: |
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- compatible : Should be "jedec,lpddr2-timings" |
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- min-freq : minimum DDR clock frequency for the speed-bin. Type is <u32> |
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- max-freq : maximum DDR clock frequency for the speed-bin. Type is <u32> |
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Optional properties: |
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The following properties represent AC timing parameters from the memory |
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data-sheet of the device for a given speed-bin. All these properties are |
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of type <u32> and the default unit is ps (pico seconds). Parameters with |
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a different unit have a suffix indicating the unit such as 'tRAS-max-ns' |
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- tRCD |
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- tWR |
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- tRAS-min |
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- tRRD |
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- tWTR |
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- tXP |
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- tRTP |
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- tDQSCK-max |
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- tFAW |
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- tZQCS |
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- tZQinit |
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- tRPab |
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- tZQCL |
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- tCKESR |
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- tRAS-max-ns |
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- tDQSCK-max-derated |
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Example: |
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timings_elpida_ECB240ABACN_400mhz: lpddr2-timings@0 { |
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compatible = "jedec,lpddr2-timings"; |
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min-freq = <10000000>; |
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max-freq = <400000000>; |
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tRPab = <21000>; |
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tRCD = <18000>; |
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tWR = <15000>; |
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tRAS-min = <42000>; |
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tRRD = <10000>; |
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tWTR = <7500>; |
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tXP = <7500>; |
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tRTP = <7500>; |
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tCKESR = <15000>; |
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tDQSCK-max = <5500>; |
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tFAW = <50000>; |
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tZQCS = <90000>; |
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tZQCL = <360000>; |
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tZQinit = <1000000>; |
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tRAS-max-ns = <70000>; |
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};
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