Owner's manual

DS3131
144 of 174
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