MSB of Program Counter changed upon PC increment
Information:
Type :: BUG
Status :: CLOSED
Assigned to ::
Arnim, Laeuger
Description:
Affected releases: 0.1 BETA, 0.2 BETA, 0.3 BETA, 0.4 BETA, 0.5 BETA
The current implementation of the Program Counter allows that the MSB (bit 11) is modifed when the PC increments at address 07FFh linear code execution. This is contrary to the description found in "The Expanded MCS-48 System" which states that bit 11 is only altered by JMP and CALL/RET but not by normal increment.
Fixed in:
pmem_crtl.vhd 1.4
New regression test: white_box/pc_wrap_bit11
Fix will be included in next release.
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