FB_CSARn field descriptions (continued)
Field Description
"expansion" address range for which the chip-selects can be active. Set the CSARn and CSMRn
registers appropriately before accessing this region.
Reserved This field is reserved.
This read-only field is reserved and always has the value 0.
31.3.2 Chip Select Mask Register (FB_CSMRn)
Specifies the address mask and allowable access types for the associated chip-select.
Address:
4000_C000h base + 4h offset + (12d × i), where i=0d to 5d
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
R
BAM
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Bit
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
R
0
WP
0
V
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
FB_CSMRn field descriptions
Field Description
31–16
BAM
Base Address Mask
Defines the associated chip-select's block size by masking address bits.
0 The corresponding address bit in CSAR is used in the chip-select decode.
1 The corresponding address bit in CSAR is a don’t care in the chip-select decode.
15–9
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
8
WP
Write Protect
Controls write accesses to the address range in the corresponding CSAR.
0 Write accesses are allowed.
1 Write accesses are not allowed. Attempting to write to the range of addresses for which the WP bit is
set results in a bus error termination of the internal cycle and no external cycle.
7–1
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
0
V
Valid
Specifies whether the corresponding CSAR, CSMR, and CSCR contents are valid. Programmed chip-
selects do not assert until the V bit is 1b (except for FB_CS0, which acts as the global chip-select).
Table continues on the next page...
Memory Map/Register Definition
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
698 NXP Semiconductors
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