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參數(shù)資料
| 型號(hào)： | MC56F8355MFGE |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 數(shù)字信號(hào)處理 |
| 英文描述： | 4-BIT, 120 MHz, OTHER DSP, PQFP128 |
| 封裝： | ROHS COMPLIANT, PLASTIC, LQFP-128 |
| 文件頁數(shù)： | 28/172頁 |
| 文件大?。?/td> | 844K |
| 代理商： | MC56F8355MFGE |
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Flash Access Blocking Mechanisms
56F8355 Technical Data, Rev. 17
Freescale Semiconductor
123
Preliminary
of security. When Flash security mode is enabled in accordance with the method described in the Flash
Memory module specification, the device will disable the core EOnCE debug capabilities. Normal
program execution is otherwise unaffected.
7.2 Flash Access Blocking Mechanisms
The 56F8355/56F8155 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:
Unsecured Mode
Secure Mode (EOnCE disabled)
When Flash security is enabled as described in the Flash Memory module specification, the device will
disable the EOnCE debug interface.
7.2.2
Disabling EOnCE Access
On-chip Flash can be read by issuing commands across the EOnCE port, which is the debug interface for
the 56800E core. The TRST, TCLK, TMS, TDO, and TDI pins comprise a JTAG interface onto which the
EOnCE port functionality is mapped. When the device boots, the chip-level JTAG TAP (Test Access Port)
is active and provides the chip’s boundary scan capability and access to the ID register.
Proper implementation of Flash security requires that no access to the EOnCE port is provided when
security is enabled. The 56800E core has an input which disables reading of internal memory via the
JTAG/EOnCE. The FM sets this input at reset to a value determined by the contents of the FM security
bytes.
7.2.3
Flash Lockout Recovery
If a user inadvertently enables Flash security on the device, a built-in lockout recovery mechanism can be
used to reenable access to the device. This mechanism completely reases all on-chip Flash, thus disabling
Flash security. Access to this recovery mechanism is built into CodeWarrior via an instruction in memory
configuration (.cfg) files. Add, or uncomment the following configuration command:
unlock_flash_on_connect 1
For more information, please see CodeWarrior MC56F83xx/DSP5685x Family Targeting Manual.
The LOCKOUT_RECOVERY instruction has an associated 7-bit Data Register (DR) that is used to
control the clock divider circuit within the FM module. This divider, FM_CLKDIV[6:0], is used to control
the period of the clock used for timed events in the FM erase algorithm. This register must be set with
appropriate values before the lockout sequence can begin. Refer to the JTAG section of the 56F8300
Peripheral User Manual for more details on setting this register value.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC56F8355VFG60 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:16-bit Hybrid Controllers |
| MC56F8355VFGE | 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC 16 BIT HYBRID CNTRLR RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT |
| MC56F8356 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:56F8356 16-bit Hybrid Controller |
| MC56F8356MFV60 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MC56F8356MFVE | 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC 16 BIT HYBRID CONTROLLER RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT |
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