den@hpfinote.HP.COM (Don Novy) (07/07/90)
Are there any limitations to using a 68020 with a faster 68882? I have read the manuals and they state that the 68020 clock cannot be more than 1.5X the 68882 clock, but can you run the 68020 slower than the 68882? Specifically I have been using a 33.3 MHz 68882 with a 25 MHz 68020 for quite a while with no problems. What will happen if I try a 50 MHz 68882 with a 25 MHz 68020? Don Novy den@hpfitst2.hp.com
eric@oakhill.UUCP (Eric Quintana) (07/11/90)
In article <16340003@hpfinote.HP.COM> den@hpfinote.HP.COM (Don Novy) writes: > > Are there any limitations to using a 68020 with a faster 68882? I have read >the manuals and they state that the 68020 clock cannot be more than 1.5X the >68882 clock, but can you run the 68020 slower than the 68882? The 68882 can handle a main CPU that is clocked 1.5X the FPU clock or less. There is no lower bound. > Specifically I have been using a 33.3 MHz 68882 with a 25 MHz 68020 for >quite a while with no problems. What will happen if I try a 50 MHz 68882 with >a 25 MHz 68020? This should work fine. If you have violated the clock ratio, you should notice spurious protocol violations. >Don Novy >den@hpfitst2.hp.com Eric Quintana ...!cs.utexas.edu!oakhill!eric