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36# Authors: Rene de Jong
37#
38
39from m5.params import *
40from m5.proxy import *
41
42from m5.objects.AbstractNVM import *
43
44#Distribution of the data.
45#sequential: sequential (address n+1 is likely to be on the same plane as n)
46#Random: @TODO Not yet implemented
47#stripe: striping over all the planes
48class DataDistribution(Enum): vals = ['sequential', 'stripe']
49
50class FlashDevice(AbstractNVM):
51    type = 'FlashDevice'
52    cxx_header = "dev/arm/flash_device.hh"
53    # default blocksize is 128 kB.This seems to be the most common size in
54    # mobile devices (not the image blocksize)
55    blk_size = Param.MemorySize("128kB", "Size of one disk block")
56    # disk page size is 2 kB. This is the most commonly used page size in
57    # flash devices
58    page_size = Param.MemorySize("2kB", "Size of one disk page")
59    # There are many GC flavours. It is impossible to cover them all; this
60    # parameter enables the approximation of different GC algorithms
61    GC_active = Param.Percent(50, "Percentage of the time (in whole numbers) \
62        that the GC is activated if a block is full")
63    # Access latencies. Different devices will have different latencies, but
64    # the latencies will be around the default values.
65    read_lat = Param.Latency("25us", "Read Latency")
66    write_lat = Param.Latency("200us", "Write Latency")
67    erase_lat = Param.Latency("1500us", "Erase Delay")
68    # Number of planes ought to be a power of two according to ONFI standard
69    num_planes = Param.UInt32(1, "Number of planes per die")
70    # Data distribution. Default is none. It is adviced to switch to stripe
71    # when more than one plane is used.
72    data_distribution = Param.DataDistribution('sequential', "Distribution \
73        of the data in the adress table; Stripe needed for multiple\
74        planes; otherwise use: sequential")
75
76