Motorola MVME712A/D3 User Manual download pdf (Page 144)

Test Descriptions

3-100 167Bug Debugging Package UserÕs Manual

Invalid Page Test - INVPAGE

This test verifies that if the segment or page descriptor for a logical address is

marked invalid, and an access is attempted to that address, an access fault will

be generated by the MC68040.

For each appropriate descriptor level and for each longword in the tested

space, the descriptor type is set to the INVALID encoding and the ATC is

flushed. The logical address under test is then accessed with the MMU

enabled. This access is expected to cause an access fault (bus error).

Command Input:

Diag-167>MMU INVPAGE

Response/Messages:

After entering this command, the display should read as follows:

MMU INVPAGE: Invalid Page................... Running --->

If the test passes, the following message sequence will be displayed:

MMU INVPAGE: Invalid Page................... Running ---> PASSED

If the test access does NOT cause an access error to be detected, the following

message type will be displayed:

MMU INVPAGE: Invalid Page................... Running ---> FAILED

Invalid Segment Descriptor

- Bus Error NOT Detected !!

If the test access causes multiple access errors to be detected, the following

message type will be displayed:

MMU INVPAGE: Invalid Page................... Running ---> FAILED

Invalid Segment Descriptor

- Recv'd x bus errors

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Motorola MVME712A/D3 User Manual Page 144