13.3.3 SRAM accesses
The SRAM is split into two logical arrays that are 32-bits wide.
• SRAM_L — Accessible by the code bus of the Cortex-M4 core and by the backdoor
port.
• SRAM_U — Accessible by the system bus of the Cortex-M4 core and by the
backdoor port.
The backdoor port makes the SRAM accessible to the non-core bus masters (such as
DMA).
The following figure illustrates the SRAM accesses within the device.
Cortex-M4 core
Code bus
System bus
SRAM controller
Backdoor
SRAM_L
SRAM_U
Crossbar switch
non-core master
non-core master
non-core master
Frontdoor
MPU
MPU
Figure 13-2. SRAM access diagram
The following simultaneous accesses can be made to different logical regions of the
SRAM:
• Core code and core system
• Core code and non-core master
• Core system and non-core master
NOTE
Burst-access cannot occur across the 0x2000_0000 boundary
that separates the two SRAM arrays. The two arrays should be
treated as separate memory ranges for burst accesses.
13.3.4 SRAM arbitration and priority control
The MCM_CPCR register controls the arbitration and priority schemes for the two
SRAM arrays.
Chapter 13 Memory and memory map
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
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