发明名称 |
Protecting data stored in ROM - using code stored in user programme with checks on data and addresses |
摘要 |
The output of a ROM (2) is coupled to a data output circuit (4) via a bus (11) and connects to a programme counter (7) and a -security code address comparator (8) over an address bus (10). A further comparator (3) connects to a status output circuit (9) to check on the security code data status bit. The security code information is included in the use programme and is located at a specific address in the memory. Checks are made using the comparators to determine correct form of address and the data. ADVANTAGE - Double check on security data and address.
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申请公布号 |
DE4107558(A1) |
申请公布日期 |
1991.09.12 |
申请号 |
DE19914107558 |
申请日期 |
1991.03.08 |
申请人 |
GOLD STAR ELECTRON CO., LTD., CHUNG CHEONG BUK, KR |
发明人 |
HAN, DAE KEUN, SUWON, KR |
分类号 |
G06F21/22;G06F12/14;G06F12/16;G06F21/02;G06F21/24;G11C11/00 |
主分类号 |
G06F21/22 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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