Manual

DS31256
152 of 181
Figure 11-4. Local Bus Access Flowchart
PCI Host Initiates a
Local Bus Access
Is Arbitration Enabled
for the Local Bus?
Is the Local Bus
Granted?
Is the External Local Bus
Ready (LRDY) Being Used?
Normal Access
Occurs
Local Bus Access
Progresses
Local Bus Access
Progresses
Timer Expired?
L
RDY Active?
Start 9 Clock Time
r
Set the LBE Status Bi
t
No
Yes
Yes
No
No
No
Yes
Yes
No
Yes
PCI Target Retr
y
Issued
A
re there 16 Clocks
Remaining?
No
Yes
Reques
t
the Bus