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Index > Main > types of clocks

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b1528932



Joined: 21 May 2010
Posts: 287
b1528932
what clocks are on pc?

- rtc clock
- 55ms timer
- silicon clock that generate cycles for main bud

what else?

how does cycle generation works? when cpu wants to execute instruction(s), it must wait untill it recive voltage on bus or what?
Post 23 Jul 2010, 19:17
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17667
Location: In your JS exploiting you and your system
revolution
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
Post 24 Jul 2010, 09:55
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chaoscode



Joined: 21 Nov 2006
Posts: 64
chaoscode
network 100Mbit/s Ethernet MAC-PHY 25Mhz on MII or 50 Mhz on RMII and 33 MHZ on ethernet Cable
Post 24 Jul 2010, 10:48
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DOS386



Joined: 08 Dec 2006
Posts: 1901
DOS386
revolution wrote:
55ms - 14.31818MHz


Confused Confused

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 Shocked

Need some very poor design example ? Check the timing "support" in IBM PC Sad

_________________
Bug Nr.: 12345

Title: Hello World program compiles to 100 KB !!!

Status: Closed: NOT a Bug
Post 24 Jul 2010, 10:48
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17667
Location: In your JS exploiting you and your system
revolution
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.
Post 24 Jul 2010, 10:53
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edfed



Joined: 20 Feb 2006
Posts: 4242
Location: 2018
edfed
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.
Post 24 Jul 2010, 18:15
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asmfan



Joined: 11 Aug 2006
Posts: 392
Location: Russian
asmfan
Have you happen to meet examples of usage (incl. HPET)?
Post 31 Jul 2010, 18:46
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