JPH0397747U - - Google Patents
Info
- Publication number
- JPH0397747U JPH0397747U JP450590U JP450590U JPH0397747U JP H0397747 U JPH0397747 U JP H0397747U JP 450590 U JP450590 U JP 450590U JP 450590 U JP450590 U JP 450590U JP H0397747 U JPH0397747 U JP H0397747U
- Authority
- JP
- Japan
- Prior art keywords
- memory
- address
- detection circuit
- invalid
- cpu
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 15
- 230000003111 delayed effect Effects 0.000 claims 3
- 239000013256 coordination polymer Substances 0.000 claims 2
- 230000001934 delay Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Techniques For Improving Reliability Of Storages (AREA)
Description
第1図及び第2図はこの考案の一実施例を示す
図、第3図及び第4図はこの考案の別の実施例を
示す図、第5図及び第6図は従来の例を示す図で
ある。
2……CPU、3……メモリ、4……アドレス
、5……データ、6……ライト信号、7……アド
レスデコーダ、8……メモリセレクト信号、9…
…不正アドレス検出回路、10……誤り検出信号
、11……故障検出回路、12……故障信号、1
3……遅延回路、17……ゲート回路。なお、図
中、同一符号は同一または相当部分を示す。
Figures 1 and 2 show one embodiment of this invention, Figures 3 and 4 show another embodiment of this invention, and Figures 5 and 6 show a conventional example. It is a diagram. 2... CPU, 3... Memory, 4... Address, 5... Data, 6... Write signal, 7... Address decoder, 8... Memory select signal, 9...
...Illegal address detection circuit, 10...Error detection signal, 11...Failure detection circuit, 12...Failure signal, 1
3...Delay circuit, 17...Gate circuit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
ラムを格納するメモリ、CPUがメモリをアクセ
スする時に出力するメモリアドレスが正しいか誤
りかを検出する不正アドレス検出回路、この不正
アドレス検出回路が出力する誤り検出信号を受信
してCPUに誤りを通報する故障検出回路、CP
Uから出力されるメモリアドレスとデータとライ
ト信号を遅延させる遅延回路、遅延後のアドレス
をメモリセレクト信号を符号化するアドレスデコ
ーダ、遅延後のライト信号を不正アドレス検出回
路の判定結果によつてメモリへ転送するか否かを
制御するゲート回路より構成され、メモリへデー
タをライトする時に不正アドレスを検出した場合
不正アドレス検出回路によつてゲート回路を制御
してライト信号を停止させ、メモリの不正アドレ
スにデータを書き込めないようにしたことを特徴
とするメモリ保護回路。 (2) 演算を実行するCPU、データ及びプログ
ラムを格納するメモリ、CPUがメモリをアクセ
スする時に出力するメモリアドレスが正しいか誤
りかを検出する不正アドレス検出回路、この不正
アドレス検出回路が出力する誤り検出信号を受信
してCPUに誤りを通報する故障検出回路、CP
Uから出力されるメモリアドレスとデータとライ
ト信号を遅延させる遅延回路、遅延後のアドレス
をメモリセレクト信号に符号化するアドレスデコ
ーダ、アドレスデコーダからのメモリセレクト信
号を不正アドレス検出回路の判定結果によつてメ
モリへ転送するか否かを制御するゲート回路より
構成され、メモリへデータをライトする時に不正
アドレスを検出した場合、不正アドレス検出回路
によつてゲート回路を制御してメモリセレクト信
号を停止させ、メモリの不正アドレスにデータを
書き込めないようにしたことを特徴とするメモリ
保護回路。[Claims for Utility Model Registration] (1) A CPU that executes calculations, a memory that stores data and programs, an invalid address detection circuit that detects whether the memory address output when the CPU accesses the memory is correct or incorrect; A failure detection circuit, CP, that receives the error detection signal output from the invalid address detection circuit and reports the error to the CPU.
A delay circuit that delays the memory address, data, and write signal output from U, an address decoder that encodes the delayed address as a memory select signal, and a delayed write signal that is sent to the memory according to the determination result of the invalid address detection circuit. If an invalid address is detected when writing data to the memory, the invalid address detection circuit controls the gate circuit to stop the write signal, and prevents the write signal from being written to the memory. A memory protection circuit characterized by preventing data from being written to an address. (2) A CPU that executes operations, a memory that stores data and programs, an invalid address detection circuit that detects whether the memory address output when the CPU accesses the memory is correct or incorrect, and errors output by this invalid address detection circuit. A failure detection circuit, CP, that receives a detection signal and reports an error to the CPU.
A delay circuit that delays the memory address, data, and write signal output from U, an address decoder that encodes the delayed address into a memory select signal, and a memory select signal from the address decoder based on the determination result of the invalid address detection circuit. If an invalid address is detected when writing data to memory, the invalid address detection circuit controls the gate circuit to stop the memory select signal. , a memory protection circuit characterized by preventing data from being written to an invalid address in memory.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP450590U JPH0397747U (en) | 1990-01-22 | 1990-01-22 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP450590U JPH0397747U (en) | 1990-01-22 | 1990-01-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0397747U true JPH0397747U (en) | 1991-10-08 |
Family
ID=31508250
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP450590U Pending JPH0397747U (en) | 1990-01-22 | 1990-01-22 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0397747U (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003071550A1 (en) * | 2002-02-25 | 2003-08-28 | Renesas Technology Corp. | Semiconductor integrated circuit device |
-
1990
- 1990-01-22 JP JP450590U patent/JPH0397747U/ja active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003071550A1 (en) * | 2002-02-25 | 2003-08-28 | Renesas Technology Corp. | Semiconductor integrated circuit device |
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