发明名称 |
Integrated circuit memory write protection method and corresponding integrated circuit |
摘要 |
<p>The method involves using a high-voltage generator (1) and regulator (2) delivering the write pulse (Ve) to the memory address decoder (5) in response to a command (3) from a counter (9) initialised by a pseudo-random number generator (8). A microprocessor ( mu p) decodes a write instruction received via input/output signals (IO1,IO2) and reads the random number which is decremented to 1 at the rate of the clock (Clk). A constant delay between the external write command and the end-of-write signal is held in a memory (10) which activates another counter (11) and is programmed for each circuit.</p> |
申请公布号 |
EP0734023(A1) |
申请公布日期 |
1996.09.25 |
申请号 |
EP19960400576 |
申请日期 |
1996.03.19 |
申请人 |
SGS-THOMSON MICROELECTRONICS S.A. |
发明人 |
SOURGEN, LAURENT;WUIDART, SYLVIE |
分类号 |
G11C7/00;G11C17/00;G11C16/02;G11C16/22;(IPC1-7):G11C7/00;G11C16/06 |
主分类号 |
G11C7/00 |
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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