Intel iSBC 80 Hardware Reference Manual page 76

iSBC 80/30
DUAL PORT CTL P·PERIODS
12.12 MHz
ON BD RAM RaT
ADV MEM RDI or
ADV MEM
WRTI
SLAVE RAM RaTI
SLAVE RAM RDI OR WRTI
FF A43·15 a
FF A55·9
a
FF A55·8 Q
FF A43·11 Q
FF A43·6 Q
OFF BD CSI
ADV MEM
RDI
RAM RDI
MEM WRTI
RAM WRTI
RAM AACK/
RAM XACK/
PO P1
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
*FOR REMAINDER OF SLAVE ACCESS TIMING, SEE FIGURE 4.9
BEGINNING WITH PERIOD P13.
P2
P12 P13 PO P1
22
Figure 4-10. Dual Port CPU Access Timing With Bus Lockout
611·10
Principles of Operation
P2 P3 P4
4-11