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參數(shù)資料
| 型號： | MC56F8366VFVE |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | 16-BIT, 120 MHz, OTHER DSP, PQFP144 |
| 封裝： | ROHS COMPLIANT, LQFP-144 |
| 文件頁數(shù)： | 40/182頁 |
| 文件大?。?/td> | 1149K |
| 代理商： | MC56F8366VFVE |
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56F8366 Technical Data, Rev. 7
134
Freescale Semiconductor
Preliminary
Part 7 Security Features
The 56F8366/56F8166 offer security features intended to prevent unauthorized users from reading the
contents of the Flash Memory (FM) array. The Flash security consists of several hardware interlocks that
block the means by which an unauthorized user could gain access to the Flash array.
However, part of the security must lie with the user’s code. An extreme example would be user’s code that
dumps the contents of the internal program, as this code would defeat the purpose of security. At the same
time, the user may also wish to put a “backdoor” in his program. As an example, the user downloads a
security key through the SCI, allowing access to a programming routine that updates parameters stored in
another section of the Flash.
7.1 Operation with Security Enabled
Once the user has programmed the Flash with his application code, the device can be secured by
programming the security bytes located in the FM configuration field, which occupies a portion of the FM
array. These non-volatile bytes will keep the part secured through reset and through power-down of the
device. Only two bytes within this field are used to enable or disable security. Refer to the Flash Memory
section in the 56F8300 Peripheral User Manual for the state of the security bytes and the resulting state
of security. When Flash security mode is enabled in accordance with the method described in the Flash
Memory module specification, the device will disable external P-space accesses restricting code execution
to internal memory, disable EXTBOOT = 1 mode, and disable the core EOnCE debug capabilities. Normal
program execution is otherwise unaffected.
7.2 Flash Access Blocking Mechanisms
The 56F8366/56F8166 have several operating functional and test modes. Effective Flash security must
address operating mode selection and anticipate modes in which the on-chip Flash can be compromised
and read without explicit user permission. Methods to block these are outlined in the next subsections.
7.2.1
Forced Operating Mode Selection
At boot time, the SIM determines in which functional modes the device will operate. These are:
Internal Boot Mode
External Boot Mode
Secure Mode
When Flash security is enabled as described in the Flash Memory module specification, the device will
boot in internal boot mode, disable all access to external P-space, and start executing code from the Boot
Flash at address 0x02_0000.
This security affords protection only to applications in which the device operates in internal Flash security
mode. Therefore, the security feature cannot be used unless all executing code resides on-chip.
When security is enabled, any attempt to override the default internal operating mode by asserting the
EXTBOOT pin in conjunction with reset will be ignored.
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PDF描述 |
|---|---|
| MC56F8366VFV60 | 16-BIT, 120 MHz, OTHER DSP, PQFP144 |
| MC56F8335MFGE | 4-BIT, 120 MHz, OTHER DSP, PQFP128 |
| MC68008LC8 | 16-BIT, 8 MHz, MICROPROCESSOR, CDIP48 |
| MC68008L8 | 16-BIT, 8 MHz, MICROPROCESSOR, CDIP48 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC56F8367 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:16-bit Digital Signal Controllers |
| MC56F8367E | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:16-bit Digital Signal Controllers |
| MC56F8367EVM | 功能描述:開發(fā)板和工具包 - 其他處理器 MC56F8367 EVAL BOARD RoHS:否 制造商:Freescale Semiconductor 產(chǎn)品:Development Systems 工具用于評估:P3041 核心:e500mc 接口類型:I2C, SPI, USB 工作電源電壓: |
| MC56F8367EVME | 功能描述:開發(fā)板和工具包 - 其他處理器 MC56F8367 EVALUATION BOARD RoHS:否 制造商:Freescale Semiconductor 產(chǎn)品:Development Systems 工具用于評估:P3041 核心:e500mc 接口類型:I2C, SPI, USB 工作電源電壓: |
| MC56F8367EVME | 制造商:Freescale Semiconductor 功能描述:MC56F8367 EVALUATION BOA |
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