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> Main > types of clocks |
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revolution 24 Jul 2010, 09:55
RTC - 32768Hz
55ms - 14.31818MHz CPU - 33/66/100/133/166/200 MHz (mobo bus clock) GPU - various, depends upon manufacturer USB2 - 60MHz Network - ? MMC/PCMCIA - 20MHz COM - 1.8432MHz |
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24 Jul 2010, 09:55 |
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chaoscode 24 Jul 2010, 10:48
network 100Mbit/s Ethernet MAC-PHY 25Mhz on MII or 50 Mhz on RMII and 33 MHZ on ethernet Cable
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24 Jul 2010, 10:48 |
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DOS386 24 Jul 2010, 10:48
revolution wrote: 55ms - 14.31818MHz 
cca 55ms -> cca 18.2 Hz PIT/BIOS clock -> cca 18.2 Hz = 1/65'536 of cca 1.2 MHz -> cca 1.2 MHz = 1/4 of cca 4.8 MHz, the original 8086 IBM PC CPU frequency 
Need some very poor design example ? Check the timing "support" in IBM PC  _________________ Bug Nr.: 12345 Title: Hello World program compiles to 100 KB !!! Status: Closed: NOT a Bug |
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24 Jul 2010, 10:48 |
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revolution 24 Jul 2010, 10:53
14.31818/4 = 3.579545MHz, NTSC colour sub carrier.
14.31818/3 = 4.772727MHz, original IBM PC CPU clock. 14.31818/12 = 1.1931817MHz, clock for PIT divider. |
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24 Jul 2010, 10:53 |
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edfed 24 Jul 2010, 18:15
clock for sound cards???
44.1kHz, 48kHz, 96kHz or a multiple of these? clock for DMA? clock for IDE controler? there are many clocks in a PC. just look at which ones you need to use, and that's all. |
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24 Jul 2010, 18:15 |
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asmfan 31 Jul 2010, 18:46
Have you happen to meet examples of usage (incl. HPET)?
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31 Jul 2010, 18:46 |
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