MC68040RC33V Freescale Semiconductor, MC68040RC33V Datasheet - Page 197
MC68040RC33V
Manufacturer Part Number
MC68040RC33V
Description
IC MICROPROCESSOR 32BIT PGA-182
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68EC040FE33A.pdf
(442 pages)
Specifications of MC68040RC33V
Processor Type
M680x0 32-Bit
Speed
33MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
179-PGA
Family Name
M68000
Device Core
ColdFire
Device Core Size
32b
Frequency (max)
33MHz
Instruction Set Architecture
RISC
Supply Voltage 1 (typ)
5V
Operating Supply Voltage (max)
5.25V
Operating Supply Voltage (min)
4.75V
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Through Hole
Pin Count
182
Package Type
PGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
Compliant
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7.8.2.3 M68040 SYNCHRONOUS DMA ARBITRATION. Figure 7-37 illustrates a system
with an M68040 and a synchronous direct memory access (DMA) that contains an
M68040 interface. Figure 7-37(a) illustrates that the DMA owning the bus only when the
M68040 has no pending requests, and Figure 7-37(b) illustrates the DMA having higher
priority than the M68040 causing the M68040 to yield the bus to the DMA at any time
except when the M68040 is performing a locked bus operation. In either case, the M68040
is the default bus master; if there are no pending requests from either device, the external
arbiter gives the bus to the M68040. Similar to the M68040 fairness arbitration example,
the restriction on using LOCKE applies to this example.
MOTOROLA
BR2
NOTES:
1.
2.
LOCK
Because this example uses two MC68040s, 1 or 2 refers to the processor and its signals.
*Indicates the signal is asserted for that device.
STATE D
BR2* V
Figure 7-36. Dual M68040 Prioritized Arbitration State Diagram
LOCKE*
BB
STATE A
BR2*
BG1*, BG2
BG1*, BG2
Freescale Semiconductor, Inc.
BB*
For More Information On This Product,
Go to: www.freescale.com
M68040 USER’S MANUAL
BR2
BB
V BR2
BR1
BB
LOCK
LOCK
BR2
BR2*
LOCK*
LOCKE
LOCKE*
BG1, BG2*
BG1, BG2*
BB*
STATE C
BB
BR2 V BR1*
LOCK
STATE B
LOCK* V BB &
BR2*
LOCKE
7- 55
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