sc1200?
Devi Priya
ijpriya at hotmail.com
Wed Dec 17 21:45:01 CET 2003
Hi,
After power-on, the x86 processor is placed in real mode. That means the CPU
looks for the instruction at the address 0xffff0. Is it correct? In SC1200
datasheet, it is given that,
"Approximately 150 to 250 external clock cycles after RESET is deasserted,
the processor begins executing instructions at the top of physical memory
(address location
FFFFFFF0h). The actual number of clock cycles depends on the clock scaling
in use. Also, before execution begins, an additional 220 clock cycles are
needed when self-test is
requested. Typically, an intersegment jump is placed at FFFFFFF0h. This
instruction will force the processor to begin execution in the lowest 1 MB
of address space."
In real mode, the CPU can address only 1 MB. Then how this address could be
addressed by the CPU?
To which address does my Flash memory gets mapped to at power-on?
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