RM0402 Rev 6 187/1163
RM0402 System configuration controller (SYSCFG)
194
8 System configuration controller (SYSCFG)
The system configuration controller is mainly used to remap the memory accessible in the
code area and manage the external interrupt line connection to the GPIOs.
8.1 I/O compensation cell
By default the I/O compensation cell is not used. However when the I/O output buffer speed
is configured in 50
MHz or 100 MHz mode, it is recommended to use the compensation cell
for slew rate control on I/O t
f(IO)out
)/t
r(IO)out
commutation to reduce the I/O noise on power
supply.
When the compensation cell is enabled, a READY flag is set to indicate that the
compensation cell is ready and can be used. The I/O compensation cell can be used only
when the supply voltage ranges from 2.4 to 3.6
V.
8.2 SYSCFG registers
8.2.1 SYSCFG memory remap register (SYSCFG_MEMRMP)
This register is used for specific configurations on memory remap:
• Two bits are used to configure the type of memory accessible at address 0x0000 0000.
These bits are used to select the physical remap by software and so, bypass the BOOT
pins.
• After reset these bits take the value selected by the BOOT pins. When booting from
main Flash memory with BOOT0 pin set to 0, this register takes the value 0x00.
In remap mode, the CPU can access the external memory via ICode bus instead of System
bus which boosts up the performance.
Address offset: 0x00
Reset value: 0x0000 000X (X is the memory mode selected by the BOOT pins)
)
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res.
1514131211109876543210
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. MEM_MODE
rw rw
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