MC68EC040RC25 Freescale Semiconductor, MC68EC040RC25 Datasheet - Page 184
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MC68EC040RC25
Manufacturer Part Number
MC68EC040RC25
Description
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68EC040RC25.pdf
(442 pages)
Specifications of MC68EC040RC25
Family Name
M68000
Device Core
ColdFire
Device Core Size
32b
Frequency (max)
25MHz
Instruction Set Architecture
RISC
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Through Hole
Pin Count
179
Package Type
PGA
Lead Free Status / Rohs Status
Supplier Unconfirmed
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On the initial cycle of a line transfer, a retry causes the processor to retry the bus cycle as
illustrated in Figure 7-29. However, the processor recognizes a retry signaled during the
second, third, or fourth cycle of a line as a bus error and causes the processor to abort the
line transfer. A burst-inhibited line transfer can only be retried on the initial transfer. A
burst-inhibited line transfer aborts if a retry is signaled for any of the three long-word
transfers used to complete the line transfer. Negating the bus grant (BG) signal on the
M68040 while asserting both TA and TEA provides a relinquish and retry operation for any
bus cycle that can be retried (see Figure 7-31).
7-42
UPA1, UPA0
SIZ1, SIZ0
TM2–TM0
TT1, TT0
D31–D0
A31–A0
CIOUT
BCLK
R/W
TEA
TBI
TIP
TS
TA
Figure 7-29. Retry Operation on Line Write
Freescale Semiconductor, Inc.
C1
For More Information On This Product,
SIGNALED
RETRY
LINE
C2
M68040 USER’S MANUAL
Go to: www.freescale.com
C1
C2
RETRY CYCLE
C3
C4
C5
MOTOROLA
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