mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 186

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

Instruction Execution Timing
8.2.4 A Full History Buffer
lwz
sub
addic r4,r14,1
and
xor
ori
This example demonstrates the condition of a full history buffer. In this case, the history
buffer is full from executing the sub, add, and and instructions. It takes one more bubble
from the load writeback to allow further issue. This is the time for the history buffer to retire
sub, add, and and.
GCLK1
FETCH
DECODE
READ + EXECUTE
WRITEBACK
L ADDRESS DRIVE
L DATA
CACHE ADDRESS
LOAD WRITEBACK
E ADDRESS
E DATA
r12,64 (SP)
r5,r5,3
r3,r4.r5
r4,r3,r5
r7,r8,1
LWZ
Figure 8-6. Example of a Full History Buffer
Freescale Semiconductor, Inc.
LWZ
For More Information On This Product,
SUB
LWZ
MPC823 REFERENCE MANUAL
LWZ
SUB
Go to: www.freescale.com
ADDIC
SUB
LWZ
ADDIC
SUB
AND
ADDIC
AND
AD
XOR
LWZ
AND
XOR
AND
ORI
BUBBLE
LWZ
LWZ
LWZ
BUBBLE
MOTOROLA
XOR
XOR