TC1796
System Units (Vol. 1 of 2)
LMB External Bus Unit
User’s Manual 13-2 V2.0, 2007-07
EBU, V2.0
13.1 Block Diagram
Figure 13-2 shows the building blocks of the EBU.
Figure 13-2 EBU Block Diagram
The EBU takes PLMB transactions and translates them into the appropriate external
access(es). Two dedicated state machines control either asynchronous external
accesses or Burst Mode external accesses. The EBU further contains blocks that control
the external bus arbitration, the region selection, as well as the data and address paths.
MCB05713
Address
Bus
Control
Lines
Program
Local
Memory
Bus
Data Path
Control
External Bus
Arbitration
Asynchronous
Access
State Machine
Burst Access
State Machine
PLMB
Address
Region
Selection
PLMB
Data
PLMB Interface
Slave Master
32
External Bus Unit EBU
Address Path
Control
Data
Bus
Arbitration
Signals
24
64
64
32
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