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MC68340 Datasheet(PDF) 393 Page - Freescale Semiconductor, Inc

Part # MC68340
Description  Integrated Processor with DMA User?셲 Manual
PDF  441 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC68340 Datasheet(HTML) 393 Page - Freescale Semiconductor, Inc

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10-6
MC68340 USER’S MANUAL
MOTOROLA
S0
S1
S2
SW
SW
SW
SW
S3
S4
S5
S0
S1
S2
CLKOUT
CS0
Q1
DSACK0
Figure 10-9. 8-bit Boot ROM Timing
10.2.2 Access Time Calculations
The two time paths that are critical in an MC68340 application using the
CS
≈ signals are
shown in Figure 10-10. The first path is the time from address valid to when data must be
available to the processor; the second path is the time from
CS
≈ asserted to when data
must be available to the processor.
CS
D15–D0
A31–A0
CLKOUT
S0
S4
S1
S5
S0
t 27
t
CSDV
t
t6
ADV
t
9
Figure 10-10. Access Time Computation Diagram
As shown in the diagram, an equation for the address access time, tADV, can be
developed as follows:
tADV = tcyc(Nc – 0.5) – ts9 – ts27
where:
tcyc = system CLKOUT period
Nc = number of clocks per bus cycle
ts6 = CLKOUT high to address valid = 30 ns maximum at 16.78 MHz
ts27 = data-in valid to CLKOUT low setup = 5 ns minimum at 16.78 MHz
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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