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# Copyright (c) 2013-2015 ARM Limited
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# Authors: Rene de Jong
#
from m5.params import *
from m5.proxy import *
from AbstractNVM import *
#Distribution of the data.
#sequential: sequential (address n+1 is likely to be on the same plane as n)
#Random: @TODO Not yet implemented
#stripe: striping over all the planes
class DataDistribution(Enum): vals = ['sequential', 'stripe']
class FlashDevice(AbstractNVM):
type = 'FlashDevice'
cxx_header = "dev/arm/flash_device.hh"
# default blocksize is 128 kB.This seems to be the most common size in
# mobile devices (not the image blocksize)
blk_size = Param.MemorySize("128kB", "Size of one disk block")
# disk page size is 2 kB. This is the most commonly used page size in
# flash devices
page_size = Param.MemorySize("2kB", "Size of one disk page")
# There are many GC flavours. It is impossible to cover them all; this
# parameter enables the approximation of different GC algorithms
GC_active = Param.Percent(50, "Percentage of the time (in whole numbers) \
that the GC is activated if a block is full")
# Access latencies. Different devices will have different latencies, but
# the latencies will be around the default values.
read_lat = Param.Latency("25us", "Read Latency")
write_lat = Param.Latency("200us", "Write Latency")
erase_lat = Param.Latency("1500us", "Erase Delay")
# Number of planes ought to be a power of two according to ONFI standard
num_planes = Param.UInt32(1, "Number of planes per die")
# Data distribution. Default is none. It is adviced to switch to stripe
# when more than one plane is used.
data_distribution = Param.DataDistribution('sequential', "Distribution \
of the data in the adress table; Stripe needed for multiple\
planes; otherwise use: sequential")