Flash micro-controller with shadow boot-loader SRAM for dual-device booting of micro-controller and host
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United States of America Patent
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Jul 20, 2010
Grant Date -
Feb 14, 2008
app pub date -
Oct 19, 2007
filing date -
Aug 4, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A flash microcontroller has a Static Random-Access-Memory (SRAM) buffer that stores several blocks of boot code read from a flash memory. The boot code includes an initial boot loader, boot code and a control program that are executed by the flash microcontroller, and an operating system OS image and an external-host control program that are executed by an external host. Both the external host and the microcontroller are booted from boot code buffered in the SRAM buffer. A first-reset-read address from the external host is captured by the microcontroller during its boot sequence and stored in a mapping table along with a physical address of the block in the SRAM buffer with the operating system OS image and the external-host control program. A boot-loader state machine reads the flash ID and programs flash parameter registers with timing parameters for the flash memory.
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