s3c2410a Samsung Semiconductor, Inc., s3c2410a Datasheet - Page 353
s3c2410a
Manufacturer Part Number
s3c2410a
Description
16/32-bit Risc Arm Microprocessor
Manufacturer
Samsung Semiconductor, Inc.
Datasheet
1.S3C2410A.pdf
(599 pages)
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S3C2410A
INTERRUPT CONTROLLER
INTERRUPT PRIORITY
Each arbiter can handle six interrupt requests based on the one bit arbiter mode control (ARB_MODE) and two bits
of selection control signals (ARB_SEL) as follows:
— If ARB_SEL bits are 00b, the priority order is REQ0, REQ1, REQ2, REQ3, REQ4, and REQ5.
— If ARB_SEL bits are 01b, the priority order is REQ0, REQ2, REQ3, REQ4, REQ1, and REQ5.
— If ARB_SEL bits are 10b, the priority order is REQ0, REQ3, REQ4, REQ1, REQ2, and REQ5.
— If ARB_SEL bits are 11b, the priority order is REQ0, REQ4, REQ1, REQ2, REQ3, and REQ5.
Note that REQ0 of an arbiter always has the highest priority, and REQ5 has the lowest one. In addition, by changing
the ARB_SEL bits, we can rotate the priority of REQ1 to REQ4.
Here, if ARB_MODE bit is set to 0, ARB_SEL bits are not automatically changed, making the arbiter to operate in
the fixed priority mode (note that even in this mode, we can reconfigure the priority by manually changing the
ARB_SEL bits). On the other hand, if ARB_MODE bit is 1, ARB_SEL bits are changed in rotation fashion, e.g., if
REQ1 is serviced, ARB_SEL bits are changed to 01b automatically so as to put REQ1 into the lowest priority. The
detailed rules of ARB_SEL change are as follows:
— If REQ0 or REQ5 is serviced, ARB_SEL bits are not changed at all.
— If REQ1 is serviced, ARB_SEL bits are changed to 01b.
— If REQ2 is serviced, ARB_SEL bits are changed to 10b.
— If REQ3 is serviced, ARB_SEL bits are changed to 11b.
— If REQ4 is serviced, ARB_SEL bits are changed to 00b.
14-5
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