MPC8260 UPM Timing Diagram, Rev. 2

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Freescale Semiconductor

UPM Read-Modify-Write Cycle

4

UPM Read-Modify-Write Cycle

If the UPM is programmed for read-modify-write parity checking or ECC correction and checking, every

write access to memory that is less than the port size automatically causes a read-modify-write cycle.

The following is an example of RAM code:

Read Pattern:

00: 08ea a800

01: 00a0 0000

02: 00a0 0000

03: 00a0 0000

04: 00a0 0000

05: 01b5 5405

Write Pattern:

18: 0800 0000

19: 0000 0005