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UTMC APPLIC
ATION NOTE
_______________________________________________________________
UT69R000 Bus Control
Data Transfer Acknowledge (
DTACK
)Operation
The 69R000 allows the user to insert wait states into read and write cycles performed on the oper-
and bus. As long as Data Transfer Acknowledge (
DTACK
) is high the bus cycle stretches. The
cycle continues to hold until the
DTACK
goes low and either Bus Error (
BTERR
) or Memory
Protect (MPROT) become active. MPROT is active high; therefore, the user must ground
MPROT or use control circuitr
y
. If a condition occurs that causes MPROT to float, it could cause
DTACK
to be ignored.
Figure 1.
DTACK
Cycle MPROT High
Figure 2.
DTACK
Cycle MPROT Low
OSCIN
ST
A
TE
DTACK
MPROT
DS
OSCIN
ST
A
TE
DTACK
MPROT
DS
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