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Known bugs of the T48 uController core
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Known bugs of the T48 uController core
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======================================
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======================================
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Version: $Date: 2005-05-04 20:20:15 $
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Version: $Date: 2005-06-08 19:23:24 $
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Release 0.5 BETA
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Release 0.5 BETA
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----------------
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----------------
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*******************************************************************************
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*******************************************************************************
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MSB of Program Counter changed upon PC increment
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The current implementation of the Program Counter allows that the MSB (bit 11)
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is modifed when the PC increments at address 07FFh linear code execution. This
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is contrary to the description found in "The Expanded MCS-48 System" which
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states that bit 11 is only altered by JMP and CALL/RET but not by normal
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increment.
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Fixed in:
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pmem_crtl.vhd 1.4
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New regression test: white_box/pc_wrap_bit11
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Fix will be included in next release.
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*******************************************************************************
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Wrong clock applied to T0
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Wrong clock applied to T0
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After executing the 'ENT0 CLK' instruction, the internal clock (XTAL divided
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After executing the 'ENT0 CLK' instruction, the internal clock (XTAL divided
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by 3) should be applied to T0.
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by 3) should be applied to T0.
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The t48_core applies clk_i to T0. This is equal to XTAL in the current
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The t48_core applies clk_i to T0. This is equal to XTAL in the current
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Release 0.4 BETA
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Release 0.4 BETA
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----------------
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----------------
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*******************************************************************************
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*******************************************************************************
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MSB of Program Counter changed upon PC increment
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See above.
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*******************************************************************************
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Wrong clock applied to T0
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Wrong clock applied to T0
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See above.
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See above.
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*******************************************************************************
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*******************************************************************************
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Release 0.3 BETA
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Release 0.3 BETA
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----------------
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----------------
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*******************************************************************************
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*******************************************************************************
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MSB of Program Counter changed upon PC increment
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See above.
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*******************************************************************************
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Wrong clock applied to T0
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Wrong clock applied to T0
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See above.
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See above.
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*******************************************************************************
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*******************************************************************************
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Release 0.2 BETA
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Release 0.2 BETA
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----------------
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----------------
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*******************************************************************************
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*******************************************************************************
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MSB of Program Counter changed upon PC increment
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See above.
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*******************************************************************************
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Wrong clock applied to T0
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Wrong clock applied to T0
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See above.
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See above.
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*******************************************************************************
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*******************************************************************************
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Release 0.1 BETA
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Release 0.1 BETA
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----------------
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----------------
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*******************************************************************************
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*******************************************************************************
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MSB of Program Counter changed upon PC increment
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See above.
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*******************************************************************************
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Wrong clock applied to T0
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Wrong clock applied to T0
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See above.
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See above.
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*******************************************************************************
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*******************************************************************************
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