![Samsung S3C2416 User Manual Download Page 211](http://html.mh-extra.com/html/samsung/s3c2416/s3c2416_user-manual_340824211.webp)
S3C2416X RISC MICROPROCESSOR
INTERRUPT CONTROLLER
10-7
1.4 INTERRUPT PRIORITY
We have two groups of arbiters. One group is ARBITER0~ARBITER5, and the other is
ARMBITER6~ARBITER11. The former group has higher priority than the latter group. And priority of arbiters in
each group can be set as below separately.
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.
Summary of Contents for S3C2416
Page 122: ...BUS MATRIX EBI S3C2416X RISC MICROPROCESSOR 3 4 NOTES ...
Page 204: ...DMA CONTROLLER S3C2416X RISC MICROPROCESSOR 8 18 NOTES ...
Page 284: ...WATCHDOG TIMER S3C2416X RISC MICROPROCESSOR 11 6 NOTES ...
Page 320: ...REAL TIME CLOCK S3C2416X RISC MICROPROCESSOR 13 16 NOTES ...
Page 344: ...UART S3C2416X RISC MICROPROCESSOR 14 24 NOTES ...
Page 380: ...USB2 0 DEVICE S3C2416X RISC MICROPROCESSOR 16 34 NOTES ...
Page 432: ...2D S3C2416X RISC MICROPROCESSOR 18 38 NOTES ...
Page 446: ...HS_SPI CONTROLLER S3C2416X RISC MICROPROCESSOR 19 14 NOTES ...
Page 604: ...S3C2416X RISC MICROPROCESSOR S3C2416X RISC MICROPROCESSOR 23 22 NOTES ...
Page 638: ...PCM AUDIO INTERFACE S3C2416X RISC MICROPROCESSOR 25 18 NOTES ...
Page 670: ...ELECTRICAL DATA S3C2416X RISC MICROPROCESSOR 26 32 NOTES ...