TC1796
System Units (Vol. 1 of 2)
LMB External Bus Unit
User’s Manual 13-60 V2.0, 2007-07
EBU, V2.0
• Finally at LMBCLK edge 5, as a result of the WAIT input sampled as high at LMBCLK
edge 3, the EBU terminates the Command Phase, reads the input data from
D[31:0],and starts the Recovery Phase.
Figure 13-21 External Wait Insertion (Asynchronous Mode)
LMBCLK
A[23:0]
Address
MCT05732
AP CPi1 CPi2 CPe3 CPe4
CSx
RD
D[31:0]
RP1
Read Access with Asynchronous WAIT
1 2 3 4 5
Data in
In the example above, the Command Delay phase is internally
programmed to zero LMBCLK cycles (no Command Delay phase).
The Command Phase is internally programmed to two LMBCLK cycles.
All other phases are programmed for one LMBCLK cycle.
Note:
WAIT
(active low)