Information

MCM_CR field descriptions (continued)
Field Description
Defines the arbitration scheme and priority for the processor and SRAM backdoor accesses to the
SRAM_L array.
00 Round robin
01 Special round robin (favors SRAM backoor accesses over the processor)
10 Fixed priority. Processor has highest, backdoor has lowest
11 Fixed priority. Backdoor has highest, processor has lowest
27
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
26
SRAMUWP
SRAM_U write protect
When this bit is set, writes to SRAM_U array generates a bus error.
25–24
SRAMUAP
SRAM_U arbitration priority
Defines the arbitration scheme and priority for the processor and SRAM backdoor accesses to the
SRAM_U array.
00 Round robin
01 Special round robin (favors SRAM backoor accesses over the processor)
10 Fixed priority. Processor has highest, backdoor has lowest
11 Fixed priority. Backdoor has highest, processor has lowest
23–10
Reserved
This field is reserved.
9
Reserved
This field is reserved.
8–0
Reserved
This field is reserved.
Memory map/register descriptions
K20 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
348
Preliminary
Freescale Semiconductor, Inc.
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