DescriptionResetTypeNameBit/Field
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
0ROreserved18:6
Address Bus Size
This field defines the size of the address bus. The address can be up
to 4-bits wide with a 24-bit data bus, up to 12-bits wide with a 16-bit data
bus, and up to 20-bits wide with an 8-bit data bus. If the full address bus
is not used, use the least significant address bits. Any unused address
bits can be used as GPIOs by clearing the AFSEL bit for the
corresponding GPIOs.
The values are:
DescriptionValue
No address0x0
Up to 4 bits wide.0x1
Up to 12 bits wide. This size cannot be used with 24-bit data.0x2
Up to 20 bits wide. This size cannot be used with data sizes
other than 8.
0x3
0x0RWASIZE5:4
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
0x0ROreserved3:2
Size of Data Bus
This field defines the size of the data bus (starting at EPI0S0). Subsets
of these numbers can be created by clearing the AFSEL bit for the
corresponding GPIOs. Note that size 32 may not be used with clock,
frame, address, or other control.
The values are:
DescriptionValue
8 Bits Wide (EPI0S0 to EPI0S7)0x0
16 Bits Wide (EPI0S0 to EPI0S15)0x1
24 Bits Wide (EPI0S0 to EPI0S23)0x2
32 Bits Wide (EPI0S0 to EPI0S31)
This size may not be used with an EPI clock. This value is
normally used for acquisition input and actuator control as well
as other general-purpose uses that require 32 bits per direction.
0x3
0x0RWDSIZE1:0
June 18, 2014878
Texas Instruments-Production Data
External Peripheral Interface (EPI)
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