MC68040FE25V Freescale Semiconductor, MC68040FE25V Datasheet - Page 404
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MC68040FE25V
Manufacturer Part Number
MC68040FE25V
Description
IC MICROPROCESSOR 32BIT 184-CQFP
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68EC040FE33A.pdf
(442 pages)
Specifications of MC68040FE25V
Processor Type
M680x0 32-Bit
Speed
25MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
184-CQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
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Once RSTI negates, the processor is internally held in reset for another 124 clocks
maximum. During the reset period, all signals that can be, are three-stated, and the rest
are driven to their inactive state. Once the internal reset signal negates, all bus signals
continue to remain in a high-impedance state until the processor is granted the bus.
Afterwards, the first bus cycle for reset exception processing begins. Figure C-2 illustrates
that the processor assumes implicit bus ownership before the first bus cycle begins.
For processor resets after the initial power-on reset, RSTI should be asserted for at least
10 clock periods. The Figure C-3 illustrates timings associated with a reset when the
processor is executing bus cycles. Note that BB and TIP (and TA if driven during a
snooped access) are negated before transitioning to a three-state level.
C-8
CDIS, MDIS*,
NOTE: * Not on MC68EC040V.
IPL2–IPL0
SIGNALS
V CC
Figure C-2. MC68040V and MC68EC040V Initial Power-On Reset Timing
BCLK
RSTI
+5 V
BUS
0 V
TIP
BG
BR
TS
BB
MI
Undefined
Freescale Semiconductor, Inc.
For More Information On This Product,
CLOCKS
t 10
>
M68040 USER’S MANUAL
Go to: www.freescale.com
CLOCKS
2
CLOCKS
128
MOTOROLA
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