lpddr2.txt

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    1 * LPDDR2 SDRAM memories compliant to JEDEC JESD209-2
    2 
    3 Required properties:
    4 - compatible : Should be one of - "jedec,lpddr2-nvm", "jedec,lpddr2-s2",
    5   "jedec,lpddr2-s4"
    6 
    7   "ti,jedec-lpddr2-s2" should be listed if the memory part is LPDDR2-S2 type
    8 
    9   "ti,jedec-lpddr2-s4" should be listed if the memory part is LPDDR2-S4 type
   10 
   11   "ti,jedec-lpddr2-nvm" should be listed if the memory part is LPDDR2-NVM type
   12 
   13 - density  : <u32> representing density in Mb (Mega bits)
   14 
   15 - io-width : <u32> representing bus width. Possible values are 8, 16, and 32
   16 
   17 Optional properties:
   18 
   19 The following optional properties represent the minimum value of some AC
   20 timing parameters of the DDR device in terms of number of clock cycles.
   21 These values shall be obtained from the device data-sheet.
   22 - tRRD-min-tck
   23 - tWTR-min-tck
   24 - tXP-min-tck
   25 - tRTP-min-tck
   26 - tCKE-min-tck
   27 - tRPab-min-tck
   28 - tRCD-min-tck
   29 - tWR-min-tck
   30 - tRASmin-min-tck
   31 - tCKESR-min-tck
   32 - tFAW-min-tck
   33 
   34 Child nodes:
   35 - The lpddr2 node may have one or more child nodes of type "lpddr2-timings".
   36   "lpddr2-timings" provides AC timing parameters of the device for
   37   a given speed-bin. The user may provide the timings for as many
   38   speed-bins as is required. Please see Documentation/devicetree/
   39   bindings/ddr/lpddr2-timings.txt for more information on "lpddr2-timings"
   40 
   41 Example:
   42 
   43 elpida_ECB240ABACN : lpddr2 {
   44         compatible      = "Elpida,ECB240ABACN","jedec,lpddr2-s4";
   45         density         = <2048>;
   46         io-width        = <32>;
   47 
   48         tRPab-min-tck   = <3>;
   49         tRCD-min-tck    = <3>;
   50         tWR-min-tck     = <3>;
   51         tRASmin-min-tck = <3>;
   52         tRRD-min-tck    = <2>;
   53         tWTR-min-tck    = <2>;
   54         tXP-min-tck     = <2>;
   55         tRTP-min-tck    = <2>;
   56         tCKE-min-tck    = <3>;
   57         tCKESR-min-tck  = <3>;
   58         tFAW-min-tck    = <8>;
   59 
   60         timings_elpida_ECB240ABACN_400mhz: lpddr2-timings@0 {
   61                 compatible      = "jedec,lpddr2-timings";
   62                 min-freq        = <10000000>;
   63                 max-freq        = <400000000>;
   64                 tRPab           = <21000>;
   65                 tRCD            = <18000>;
   66                 tWR             = <15000>;
   67                 tRAS-min        = <42000>;
   68                 tRRD            = <10000>;
   69                 tWTR            = <7500>;
   70                 tXP             = <7500>;
   71                 tRTP            = <7500>;
   72                 tCKESR          = <15000>;
   73                 tDQSCK-max      = <5500>;
   74                 tFAW            = <50000>;
   75                 tZQCS           = <90000>;
   76                 tZQCL           = <360000>;
   77                 tZQinit         = <1000000>;
   78                 tRAS-max-ns     = <70000>;
   79         };
   80 
   81         timings_elpida_ECB240ABACN_200mhz: lpddr2-timings@1 {
   82                 compatible      = "jedec,lpddr2-timings";
   83                 min-freq        = <10000000>;
   84                 max-freq        = <200000000>;
   85                 tRPab           = <21000>;
   86                 tRCD            = <18000>;
   87                 tWR             = <15000>;
   88                 tRAS-min        = <42000>;
   89                 tRRD            = <10000>;
   90                 tWTR            = <10000>;
   91                 tXP             = <7500>;
   92                 tRTP            = <7500>;
   93                 tCKESR          = <15000>;
   94                 tDQSCK-max      = <5500>;
   95                 tFAW            = <50000>;
   96                 tZQCS           = <90000>;
   97                 tZQCL           = <360000>;
   98                 tZQinit         = <1000000>;
   99                 tRAS-max-ns     = <70000>;
  100         };
  101 
  102 }

Cache object: cece4bcca5e70adf6510d5ded6760cfc

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/ddr/lpddr2.txt

FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/ddr/lpddr2.txt