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| 型號(hào)： | PSD302R |
| 英文描述： | Field Programmable Microcontroller Peripherals(可編程邏輯,無(wú)SRAM,19個(gè)可編程I/O,通用PLD有16個(gè)輸入) |
| 中文描述： | 現(xiàn)場(chǎng)可編程微控制器外圍設(shè)備（可編程邏輯，無(wú)的SRAM，19余個(gè)可編程輸入/輸出，通用PLD的有16個(gè)輸入） |
| 文件頁(yè)數(shù)： | 3/3頁(yè) |
| 文件大小： | 46K |
| 代理商： | PSD302R |
PSD3XX – Application Note 018
1-151
Security Bit
File Location
The object file created by compilation with Maple software is an Intel Intelec format,
compatible file.
The programming algorithm defines the address scrambling that translates the file
addresses to device addresses (the address that the device “sees” on its address pins
during programming). By looking at a screen dump or a hard copy of the object file the user
can determine the status of the security bit.
The security bit of the PSD301/311 resides in data bit #1 of file address 81D3h. This
address contains three configuration bits that reside in data bits 0 – 2, so this address in the
file can have any value between 0 and 7.
If this address has a value X1X (where X can be either 0 or 1), the security bit is off
(‘1’ value means an unprogrammed bit) and CSECURITY = 0 (displayed by Mappro WSI
programmer interface software as SECA = 0).
If this address has a value X0X, the security bit is on and CSECURITY = 1 (displayed by
Mappro WSI programmer interface software as SECA = 1).
The security bit of PSD302/312 resides in data bit #1 of file address 10253h. This address
contains three configuration bits that reside in data bits 0 – 3 (bit 3 is reserved for future
usage). This address can have any value between 0 and F. If this address has a value
XX1X (where X can be either 0 or 1), the security bit is OFF (‘1’ value means an unpro-
grammed bit) and CSECURITY = 0 (displayed by Mappro WSI programmer interface soft-
ware as SECA = 0). If this address has a value XX0X, the security bit is ON and CSECU-
RITY = 1 (displayed by Mappro WSI programmer interface software as SECA = 1).
If users do not want to look for the security bit status in the object file, they can call
MAPPRO programming software from the main menu of MAPLE, Load the RAM with the
object file and display the ACR configuration bits status on the screen.
The value of SECA will indicate the status of the security bit (SECA = 0 means security is
OFF, SECA = 1 means security is ON).
Summary
The PSD3XX family of programmable microcontroller peripheral devices provides security
of design not readily available in conventional PLDs and EPROMs.
Though not entirely fool-proof, the security bit feature helps make it more cost effective
for competitors to design their own hardware instead of trying to copy systems that
already exist.
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| PSD303L | Field Programmable Microcontroller Peripherals(可編程邏輯,16K位SRAM,19個(gè)可編程I/O,通用PLD有16個(gè)輸入) |
| PSD303 | Field Programmable Microcontroller Peripherals(可編程邏輯,16K位SRAM,19個(gè)可編程I/O,通用PLD有16個(gè)輸入) |
| PSD311L | Field Programmable Microcontroller Peripherals(可編程邏輯,16K位SRAM,19個(gè)可編程I/O,通用PLD有12個(gè)輸入) |
| PSD311 | Field Programmable Microcontroller Peripherals(可編程邏輯,16K位SRAM,19個(gè)可編程I/O,通用PLD有12個(gè)輸入) |
| PSD312-15IB | Field-Programmable Peripheral |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PSD302R-12J | 制造商:WSI 功能描述: |
| PSD302R-15J | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Low Cost Field Programmable Microcontroller Peripherals |
| PSD302R-15JI | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Low Cost Field Programmable Microcontroller Peripherals |
| PSD302R-15JM | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Low Cost Field Programmable Microcontroller Peripherals |
| PSD302R-20J | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Low Cost Field Programmable Microcontroller Peripherals |
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