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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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M50FW040 Arkusz danych(PDF) 31 Page - STMicroelectronics |
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M50FW040 Arkusz danych(HTML) 31 Page - STMicroelectronics |
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31 / 53 page  M50FW040 Firmware hub (FWH) interface Configuration Registers 31/53 6.1.3 Lock Down The Lock Down Bit provides a mechanism for protecting software data from simple hacking and malicious attack. When the Lock Down Bit is set, ‘1’, further modification to the Write Lock, Read Lock and Lock Down Bits cannot be performed. A reset or power-up is required before changes to these bits can be made. When the Lock Down Bit is reset, ‘0’, the Write Lock, Read Lock and Lock Down Bits can be changed. 6.2 Firmware Hub (FWH) General-Purpose Input Register The Firmware Hub (FWH) General Purpose Input Register holds the state of the Firmware Hub Interface General Purpose Input pins, FGPI0-FGPI4. When this register is read, the state of these pins is returned. This register is read-only and writing to it has no effect. The signals on the Firmware Hub Interface General Purpose Input pins should remain constant throughout the whole Bus Read cycle in order to guarantee that the correct data is read. 6.3 Manufacturer Code Register Reading the Manufacturer Code Register returns the manufacturer code for the memory. The manufacturer code for STMicroelectronics is 20h. This register is read-only and writing to it has no effect. 6.4 Device Code Register Reading the Device Code Register returns the device code for the memory, 2Ch. This register is read-only and writing to it has no effect. 6.5 Firmware Hub (FWH) General-Purpose Input Register The Firmware Hub (FWH) General Purpose Input Register holds the state of the Firmware Hub Interface General Purpose Input pins, FGPI0-FGPI4. When this register is read, the state of these pins is returned. This register is read-only and writing to it has no effect. The signals on the Firmware Hub Interface General Purpose Input pins should remain constant throughout the whole Bus Read cycle in order to guarantee that the correct data is read. 6.6 Manufacturer Code Register Reading the Manufacturer Code Register returns the manufacturer code for the memory. The manufacturer code for STMicroelectronics is 20h. This register is read-only and writing to it has no effect. |
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