MMCCMB2107 Freescale, MMCCMB2107 Datasheet - Page 580

• Manufacturer Part Number: MMCCMB2107
• Manufacturer: Freescale

Specifications of MMCCMB2107

• Lead Free Status / RoHS Status: Not Compliant

JTAG Test Access Port and OnCE
21.14.13 Instruction Address FIFO Buffer (PC FIFO)
Technical Data
580
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 21-15
Freescale Semiconductor, Inc.
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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 21-15. OnCE PC FIFO
TCLK
TDO
CIRCULAR
POINTER
BUFFER
MMC2107 – Rev. 2.0
MOTOROLA