ST STM32L4x6 User Manual

Firewall (FW) RM0351
128/1693 DocID024597 Rev 3
4.4 Firewall registers
4.4.1 Code segment start address (FW_CSSA)
Address offset: 0x00
Reset value: 0x0000 0000
4.4.2 Code segment length (FW_CSL)
Address offset: 0x04
Reset value: 0x0000 0000
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Res. Res. Res. Res. Res. Res. Res. Res. ADD[23:16]
rw
15141312111098 7 6543210
ADD[15:8] Res Res Res Res Res Res Res Res
rw
Bits 31:24 Reserved, must be kept at reset value.
Bits 23:8 ADD[23:8]: code segment start address
The LSB bits of the start address (bit 7:0) are reserved and forced to 0 in order to allow a
256-byte granularity.
Note: These bits can be written only before enabling the Firewall. Refer to Section 4.3.5:
Firewall initialization.
Bits 7:0 Reserved, must be kept at the reset value.
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. LENG[21:16]
rw
1514131211109876543210
LENG15:8] Res. Res. Res. Res. Res. Res. Res. Res.
rw
Bits 31:22 Reserved, must be kept at the reset value.
Bits 21:8 LENG[21:8]: code segment length
LENG[21:8] selects the size of the code segment expressed in bytes but is a multiple of
256 bytes.
The segment area is defined from {ADD[23:8],0x00} to {ADD[23:8]+LENG[21:8], 0x00} - 0x01
Note: If LENG[21:8] = 0 after enabling the Firewall, this segment is not defined, thus not
protected by the Firewall.
These bits can only be written before enabling the Firewall. Refer to Section 4.3.5:
Firewall initialization.
Bits 7:0 Reserved, must be kept at the reset value.

ST STM32L4x6 Specifications

General

Brand	ST
Model	STM32L4x6
Category	Microcontrollers
Language	English