| ??? 05/05/09 04:11 Read: times |
#165052 - You sure about your math? Responding to: ???'s previous message |
I probably misunderstood something but:
Richard said:
but that one intended for ASIC claims it's 8.1 times faster than the standard 805x at the same crystal frequency. The SiLabs 'F12x's and Maxim/Dallas DS89c4x0's are certainly capable of more speed. In fact, any one-clocker at 25 MHz is as fast as that one at 300 MHz, at first glance. Not very impressive! But a bit simplified: The standard 805x is a 12-clocker, and they claim 8.1x faster speed at the same clock frequency. So a 25MHz one-clocker would do about 25 MIPS? And a 300MHz ASIC running 8.1 times faster than a 12-clocker at the same clock speed would do about 300*8.1/12=217 MIPS at 300MHz and about 12*8.1/12 = 8.1 MIPS at 12MHz? If you say that a 25MHz one-clocker is the same speed as this ASCI implementation is at 300Mhz, then you are saying that the ASIC implementation is a 12-clocker. But such a claim would be incompatible with any claim that it is 8.1 times faster than the standard 805x at the same crystasl frequency - the claim would then be that it is the same speed as a standard 805x at the same crystal frequency. The 8.1 times claim sounds to me like the ASIC implementation is averaging just under 1.5 clocks/MIPS - a weighted average between one-clock and two-clock instructions depending on the mix of instructions. If the solution can do 217 MIPS with a reasonable power consumption, then I would think that quite impressive. |
