Rabbit 2000 - 16. Rabbit BIOS and Virtual Driver; 16.1 The BIOS

User’s Manual 159
I/O bus cycles have an automatic wait state and thus require 3 clocks plus any extra wait
states specified.
Figure 15-4. I/O Read and Write Cycles No Extra Wait States
T
adr
T
adr
External I/O Read (no extra wait states)
T
hold
valid
CLK
A[15:0]
D[7:0]
valid
T
setup
T
hold
External I/O Write (no extra wait states)
CLK
A[15:0]
D[7:0]
/CSx
/OEx
/CSx
/WEx
valid
T1
Tw
T1
Tw
T2
valid
T2
valid
/IOCSx
/IORD
/BUFEN
valid
/IOCSx
/IOWR
/BUFEN