Method and apparatus for distinguishing register reads from memo

Details Method and apparatus for distinguishing register reads from memo Method and apparatus for distinguishing register reads from memo

1997-09-24

2000-07-04

Yoo, Do Hyun

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

711156, G06F 1202

Patent

active

060852828

ABSTRACT:
A non-volatile memory (12) such as FLASH provides for two modes of operation: command mode and memory mode. Read requests in command mode read non-volatile memory status information, such as from status registers (29). Reads in memory mode return data stored in a non-volatile memory array (20, 22). A command mode read is distinguished from a memory mode read by whether a command mode indication is received within the same memory cycle as a read indication. The command read indication may be an operand address within a prespecified range of memory addresses or through a dedicated input pin. The prespecified memory addresses may be memory-mapped to status registers (29), allowing reads of status registers (29) when an operand address is within the prespecified range without the necessity of entering and leaving command mode, and otherwise to data (20, 22) stored in the non-volatile memory (12).

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