MC68040FE33A Freescale Semiconductor, MC68040FE33A Datasheet - Page 197
MC68040FE33A
Manufacturer Part Number
MC68040FE33A
Description
IC MICROPROCESSOR 32BIT 184-CQFP
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68EC040FE33A.pdf
(442 pages)
Specifications of MC68040FE33A
Processor Type
M680x0 32-Bit
Speed
33MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
184-CQFP
Package
184CQFP
Processor Series
M680xx
Core
CPU32
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
Details
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC68040FE33A
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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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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