| ??? 09/08/05 17:46 Read: times |
#100828 - Wrong Responding to: ???'s previous message |
Abhishek Singh said:
ok but here op talks about the IP roll over No, he didn't. He didn't even mention registers at all: Rupesh Deenadayalan said:
... when the microcontroller reaches to fffffth memory location it rolls over to 00000th memory location ... The 20-bit Effective Address (ie, the physical memory address) is calculated from the 16-bit Segment & Offset as follows: EA = Segment*16 + OffsetSee: http://www.ece.msstate.edu/~reese/EE...de0019.htm So, if Segment=FFFF AND Offset=000F, EA = FFFF0 + 000F = FFFFFIf the Offset is now incremented by one to 0010, we get EA = FFFF0 + 0010 = 00000 (botton 20 bits)So incrementing the Offset can cause the Effective Address to roll-over from FFFFF to 00000. |
| Topic | Author | Date |
| Micro Controller powered? | 01/01/70 00:00 | |
| bible study time? | 01/01/70 00:00 | |
| Reboot ? | 01/01/70 00:00 | |
| See reply (Off-Topic) | 01/01/70 00:00 | |
| Not A PC | 01/01/70 00:00 | |
| Reboot doubt | 01/01/70 00:00 | |
| Off Topic. | 01/01/70 00:00 | |
| Rampant code execution | 01/01/70 00:00 | |
| CS:IP | 01/01/70 00:00 | |
| Irrelevant? | 01/01/70 00:00 | |
| irrelevent: irrelevent? | 01/01/70 00:00 | |
| TOTALLY irrelevant, at least at a '51 fo | 01/01/70 00:00 | |
| Already established! | 01/01/70 00:00 | |
| Wrong | 01/01/70 00:00 | |
| You Sure? | 01/01/70 00:00 | |
If you want a proper answer... | 01/01/70 00:00 |