NOTE
Burst accesses cannot occur across the 2000_0000h boundary
that separates the two SRAM arrays. The two arrays should be
treated as separate memory ranges for burst accesses.
To supplement the main system RAM, FlexRAM can be used as system RAM. However,
FlexRAM accesses involve additional system latencies.
28.3.3 SRAM arbitration and priority control
The
Core Platform Control Register (MCM_CPCR)
controls the arbitration and priority
schemes for the two SRAM arrays.
28.3.4 SRAM retention: power modes and resets
Power to the SRAM is maintained in all power modes.
To retain and access SRAM contents across functional resets, write application code to
execute the following sequence:
System Reset Interrupt Enable Register (RCM_SRIE)
reset and instead generate an interrupt on every reset request.
2. On an interrupt for a reset request, application code configures the chip to enter Run
mode and then writes 0 to both
. This logic ensures that any attempted access to SRAM
is blocked after these bits are written, thereby preventing memory corruption during
reset assertion.
3. The chip remains in Run mode until the reset asserts.
NOTE
During software initialization, ensure that no accesses
occur to RAM with retained contents.
4. After exiting reset, read
and write 1 to them to allow accesses to SRAM.
28.3.5 SRAM access: Behavior of device when in accessing a
memory with multi-bit ECC error
SRAM configuration
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632
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