Single shared ROM for storing keyboard microcontroller code portion and CPU code portion and disabling access to a portion while accessing to the other
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United States of America Patent
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Feb 11, 1997
Grant Date -
N/A
app pub date -
Jan 27, 1994
filing date -
Jan 27, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A shared keyboard and system ROM uses a single ROM for both the keyboard and the system operating system information (BIOS). The shared ROM is never simultaneously used for both of these functions. At initial boot-up, the system processor executes from the shared ROM to copy the system BIOS information to the system Random Access Memory DRAM. Once this copying has been completed, the shared ROM then is used by the keyboard subsystem. Different address ranges are employed in the shared ROM for the keyboard information and for the system BIOS.
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