DocID024597 Rev 5 147/1830
RM0351 Firewall (FW)
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4.4.7 Configuration register (FW_CR)
Address offset: 0x20
Reset value: 0x0000 0000
Bits 31:18 Reserved, must be kept at the reset value.
Bit 17 LENG[17]: volatile data segment length (only for STM32L496xx/4A6xx devices)
Bits 16:6 LENG[16:6]: volatile data segment length
LENG[16:6] selects the size of the volatile data segment expressed in bytes but is a multiple
of 64 bytes.
The segment area is defined from {ADD[16:6],0x00} to {ADD[16:6]+LENG[16:6], 0x00} - 0x01
Note: If LENG[17:6] = 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 5:0 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. Res. Res. Res. Res. Res. Res.
1514131211109876543210
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. VDE VDS FPA
rw rw rw
Bits 31:3 Reserved, must be kept at the reset value.
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