| * AC timing parameters of LPDDR2(JESD209-2) memories for a given speed-bin |
| |
| Required properties: |
| - compatible : Should be "jedec,lpddr2-timings" |
| - min-freq : minimum DDR clock frequency for the speed-bin. Type is <u32> |
| - max-freq : 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). Parameters with |
| a different unit have a suffix indicating the unit such as 'tRAS-max-ns' |
| - tRCD |
| - tWR |
| - tRAS-min |
| - tRRD |
| - tWTR |
| - tXP |
| - tRTP |
| - tDQSCK-max |
| - tFAW |
| - tZQCS |
| - tZQinit |
| - tRPab |
| - tZQCL |
| - tCKESR |
| - tRAS-max-ns |
| - tDQSCK-max-derated |
| |
| Example: |
| |
| timings_elpida_ECB240ABACN_400mhz: lpddr2-timings@0 { |
| compatible = "jedec,lpddr2-timings"; |
| min-freq = <10000000>; |
| max-freq = <400000000>; |
| tRPab = <21000>; |
| tRCD = <18000>; |
| tWR = <15000>; |
| tRAS-min = <42000>; |
| tRRD = <10000>; |
| tWTR = <7500>; |
| tXP = <7500>; |
| tRTP = <7500>; |
| tCKESR = <15000>; |
| tDQSCK-max = <5500>; |
| tFAW = <50000>; |
| tZQCS = <90000>; |
| tZQCL = <360000>; |
| tZQinit = <1000000>; |
| tRAS-max-ns = <70000>; |
| }; |
