公开(公告)号：EP0283238A2

公开(公告)日：1988-09-21

申请号：EP88302235.2

申请日：1988-03-15

申请人： HITACHI, LTD.

发明人： Mitsuishi, Naoki ,  Takamori, Yoh No. 103, Dainifujikohpo ,  Matsubara, Kiyoshi ,  Ozawa, Yoshiyuki

IPC分类号： G11C16/06

CPC分类号： G11C16/16 ,  G06F12/1433 ,  G11C16/06 ,  G11C16/22 ,  G11C16/26

摘要： A means (35) for latching stored data is disposed outside an array of non-volatile memory cells (1). Before erasure of the memory cells (1), some of the stored data items in the non-volatile memory cells are transferred to and held in the latch means (35). The saved data items are written again after erasure, or alternatively, the data items transferred to the latch means (35) are used to determine certain designated regions in which erasure is inhibited. This enables the conservation of certain stored items, and thus, the prevention of illicit use. The shortening of testing time is also made compatible with the conservation.

摘要翻译： 用于锁存存储的数据的装置（35）设置在非易失性存储单元（1）的阵列的外部。 在擦除存储器单元（1）之前，将非易失性存储单元中的一些存储的数据项传送到并保持在锁存装置（35）中。 保存的数据项在擦除之后再次被写入，或者替代地，传送到锁存装置（35）的数据项被用于确定某些被禁止擦除的指定区域。 这使得能够保存某些存储的物品，从而防止非法使用。 测试时间缩短也与保存兼容。

公开(公告)号：EP0215464A2

公开(公告)日：1987-03-25

申请号：EP86112703.3

申请日：1986-09-15

申请人： HITACHI, LTD.

发明人： Matsubara, Kiyoshi ,  Yamaura, Tadashi

IPC分类号： G11C29/00 ,  G06F11/26

CPC分类号： G06F21/79 ,  G11C29/04

摘要： A semiconductor integrated circuit device inhibits the output of programmed data of its built-in memory (ROM) to an external terminal (TO) but outputs the result of comparison of the programmed data with an input signal supplied from an external terminal (I, I/O) to the external terminal (TO).