DS31256 Datasheet, PDF (152/183 Pages) Maxim Integrated Products – 256-Channel, High-Throughput HDLC Controller

DS31256 256-Channel, High-Throughput HDLC Controller
Figure 11-4. Local Bus Access Flowchart
PCI Host Initiates a
Local Bus Access
No
Is Arbitration Enabled
for the Local Bus?
Yes
Is the Local Bus
Granted?
Yes
Are there 16 Clocks
Remaining?
Yes
Yes
Is the External Local Bus
Ready (LRDY) Being Used?
No
No
No
Start 9 Clock Timer
LRDY Active?
Yes
No
Timer Expired?
No
Yes
Local Bus Access
Progresses
Local Bus Access
Progresses
Request
the Bus
Set the LBE Status Bit
Normal Access
Occurs
PCI Target Retry
Issued
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