Geode GX1: IO Recovery Time is 6 clocks
Can anyone interpret this value? Does it mean "Recovery on PCI bus" side? The GX1 processor only has a PCI bus, nothing else.
yes, i can :)
Quote from: "Cyrix MediaGX Databook, October 29, 1998 - Revision 2.0, Cyrix Corporation"
"3.4.1 I/O Address Space The CPU I/O address space is accessed using IN and OUT instructions to addresses referred to as “ports.” The accessible I/O address space is 64KB and can be accessed as 8-bit, 16-bit or 32-bit ports. The MediaGX processor configuration registers reside within the I/O address space at port addresses 22h and 23h and are accessed using the standard IN and OUT instructions."
Index E8h : CCR4 "2:0 IORT(2:0) I/O Recovery Time: Specifies the minimum number of bus clocks between I/O accesses: 000 = No clock delay 100 = 16-clock delay 001 = 2-clock delay 101 = 32-clock delay (default value after reset) 010 = 4-clock delay 110 = 64-clock delay 011 = 8-clock delay 111 = 128-clock delay Cleared to 0 at reset."