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The embedded SRAM is located at address 0x20000000 in the memory map of the EFM32GG. When
running code located in SRAM starting at this address, the Cortex-M3 uses the System bus interface to
fetch instructions. This results in reduced performance as the Cortex-M3 accesses stack, other data in
SRAM and peripherals using the System bus interface. To be able to run code from SRAM efficiently,
the SRAM is also mapped in the code space at address 0x10000000. When running code from this
space, the Cortex-M3 fetches instructions through the I/D-Code bus interface, leaving the System bus
interface for data access. The SRAM mapped into the code space can however only be accessed by
the CPU, i.e. not the DMA.
5.2.1 Bit-banding
The SRAM bit-band alias and peripheral bit-band alias regions are located at 0x22000000 and
0x42000000 respectively. Read and write operations to these regions are converted into masked single-
bit reads and atomic single-bit writes to the embedded SRAM and peripherals of the EFM32GG.
Using a standard approach to modify a single register or SRAM bit in the aliased regions, would require
software to read the value of the byte, half-word or word containing the bit, modify the bit, and then
write the byte, half-word or word back to the register or SRAM address. Using bit-banding, this can be
done in a single operation. As read-writeback, bit-masking and bit-shift operations are not necessary in
software, code size is reduced and execution speed improved.
The bit-band regions allow each bit in the SRAM and Peripheral areas of the memory map to be
addressed. To set or clear a bit in the embedded SRAM, write a 1 or a 0 to the following address:
Memory SRAM Area Set/Clear Bit
bit_address = 0x22000000 + (address – 0x20000000) × 32 + bit × 4
(5.1)
where address is the address of the 32-bit word containing the bit to modify, and bit is the index of the
bit in the 32-bit word.
To modify a bit in the Peripheral area, use the following address:
Memory Peripheral Area Bit Modification
bit_address = 0x42000000 + (address – 0x40000000) × 32 + bit × 4
(5.2)
5.2.2 Peripherals
The peripherals are mapped into the peripheral memory segment, each with a fixed size address range
2012-04-24 - Giant Gecko Family - d0053_Rev0.96
16
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