MC68EC040RC25 Freescale Semiconductor, MC68EC040RC25 Datasheet - Page 296

• 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

10.2 INSTRUCTION TIMING EXAMPLES
The following examples utilize the instruction timing information given in this section.
Figure 10-1 illustrates the integer unit pipeline flow for the simple code sequence listed.
The three instructions in the code sequence require only a single clock in each pipeline
stage. The TRAPF instructions are also single-clock instructions that function as
nonsynchronizing NOPs.
MOTOROLA
C1 The previous instruction (P1) finishes in the <ea> calculate.
C2 MOVE.L (A) starts in the <ea> calculate and requests an immediate extension
C3 MOVE.L (A) starts in the <ea> fetch, which fetches the operand at $1000. ADDQ.L
C4 MOVE.L (A) executes in the execute stage, storing the fetched operand in register
C5 ADDQ.L (B) executes in the execution stage, incrementing D0 by 1. MOVE.L (C)
C6 MOVE.L (C) executes in the execution stage generating a write of D0 to the
C7 The write to memory by MOVE.L (C) occurs to the data memory unit if it is not
word for its effective address.
(B) starts in the <ea> calculate stage with the operand encoded in the instruction.
D0. ADDQ.L (B) starts in the <ea> fetch with no operation performed. MOVE.L (C)
starts in the <ea> calculate requesting an immediate extension word for its effective
address.
passes through the <ea> fetch with no operation performed. The next instruction
starts in the <ea> calculate stage.
effective address.
busy. If the second TRAPF instruction (N2) in the <ea> fetch stage requires an
operand fetch, the write-back for MOVE.L (C) stalls in the write-back stage since it
is a lower priority.
Figure 10-1. Simple Instruction Timing Example
<ea> CALCULATE
WRITE-BACK
<ea> FETCH
Freescale Semiconductor, Inc.
EXECUTE
For More Information On This Product,
LABEL
P1
C1
N1
N2
P1
Go to: www.freescale.com
C
A
B
M68040 USER’S MANUAL
C2
P1
A
TRAPF
MOVE.L
ADDQ.L
MOVE.L
TRAPF
TRAPF
INSTRUCTION
C3
P1
B
A
C4
$1000,D0
#1,D0
D0,$1000
C
B
A
C5
N1
C
B
CALCULATE
C6
N2
N1
C
<ea>
1
1
1
1
1
1
C7
N2
N1
C
EXECUTE
1
1
1
1
1
1
10-5