MC68EC040RC25 Freescale Semiconductor, MC68EC040RC25 Datasheet - Page 203

• Manufacturer Part Number: MC68EC040RC25
• Manufacturer: Freescale Semiconductor

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

7.9.2 Snoop-Enabled Cycle (No Intervention Required)
For alternate bus master accesses in which SCx = $1 or $2, indicating that snooping is
enabled, the M68040 continues to assert MI while checking for a matching cache line. If
intervention in the alternate bus master access is not required, MI is then negated, and
memory is allowed to respond and complete the access. Figure 7-41 illustrates an
example of snooping in which memory is allowed to respond. Best-case timing is
MOTOROLA
*
SIZ1, SIZ0
SC1, SC0
TT1, TT0
D31–D0
AM indicates the alternate bus master.
A31–A0
AM_BR
AM_BG
BCLK
R/W
BR
BG
TS
TA
BB
MI
*
Undefined
*
Freescale Semiconductor, Inc.
Figure 7-40. Snoop-Inhibited Bus Cycle
PROCESSOR
For More Information On This Product,
C1
Go to: www.freescale.com
C2
M68040 USER’S MANUAL
C3
C1
ALTERNATE
MASTER
C2
C3
PROCESSOR
7- 61