mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 185

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

8.2.3 Fastest External Load (Data Cache Miss)
lwz
sub
addic r4,r14,1
The sub instruction is dependent on the value read by the load. It causes three bubbles in
the instruction execution stream. The external clock is shifted 90 relative to the internal
clock.
GCLK1
FETCH
DECODE
READ + EXECUTE
WRITEBACK
L ADDRESS DRIVE
L DATA
CACHE ADDRESS
LOAD WRITEBACK
E ADDRESS
E DATA
r12,64 (SP)
r3,r12,3
LWZ
Freescale Semiconductor, Inc.
Figure 8-5. Example of an External Load
For More Information On This Product,
LWZ
SUB
MPC823 REFERENCE MANUAL
LWZ
Go to: www.freescale.com
LWZ
SUB
ADDIC
BUBBLE
LWZ
BUBBLE
LWZ
BUBBLE
Instruction Execution Timing
LWZ
BUBBLE
LWZ
LWZ
SUB
SUB
8-7