MMC2114 MOTOROLA [Motorola, Inc], MMC2114 Datasheet - Page 606
MMC2114
Manufacturer Part Number
MMC2114
Description
M CORE Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MMC2114.pdf
(654 pages)
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JTAG Test Access Port and OnCE
22.14.13 Instruction Address FIFO Buffer (PC FIFO)
Advance Information
606
To ease debugging activity and keep track of program flow, a
first-in-first-out (FIFO) buffer stores the addresses of the last eight
instruction change-of-flow prefetches that were issued.
The FIFO is a circular buffer containing eight 32-bit registers and one
3-bit counter. All the registers have the same address, but any read
access to the FIFO address causes the counter to increment and point
to the next FIFO register. The registers are serially available to the
external command controller through the common FIFO address.
Figure 22-16
Freescale Semiconductor, Inc.
For More Information On This Product,
JTAG Test Access Port and OnCE
Go to: www.freescale.com
shows the structure of the PC FIFO.
INSTRUCTION FETCH ADDRESS
PC FIFO SHIFT REGISTER
PC FIFO REGISTER 0
PC FIFO REGISTER 1
PC FIFO REGISTER 2
PC FIFO REGISTER 3
PC FIFO REGISTER 4
PC FIFO REGISTER 5
PC FIFO REGISTER 6
PC FIFO REGISTER 7
Figure 22-16. OnCE PC FIFO
MMC2114 • MMC2113 • MMC2112 — Rev. 1.0
TCLK
TDO
CIRCULAR
POINTER
BUFFER
MOTOROLA
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