106:528acbe53d79
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2016-06-22 |
Paul Boddie |
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Introduced a separate state-updating method and reordered methods. |
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ula.py
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105:0f424c197e92
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2016-06-22 |
Paul Boddie |
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Moved pixel generation to after the state update in the negative edge handler. |
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ula.py
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104:2a568a84bbaf
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2016-06-22 |
Paul Boddie |
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Moved video signalling into the negative edge handler in order to consolidate
updates to the horizontal and vertical pixel positions. |
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ula.py
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103:d22e09bd1f7e
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2016-06-21 |
Paul Boddie |
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Added notes about RAM access limitations preventing 2MHz RAM access by the CPU. |
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Electron.txt ULA.txt
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102:37c6315ecb87
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2016-06-21 |
Paul Boddie |
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Removed the width instance attribute. |
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ula.py
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101:4658aa28f367
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2016-06-21 |
Paul Boddie |
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Moved address preparation onto negative edges and data acquisition onto positive
edges, using the have_pixels variable to indicate if a read operation needs
completing at the start of a new 2MHz period.
Fixed various comments and docstrings. |
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ULA.txt ula.py
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100:13c8893af8c7
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2016-06-21 |
Paul Boddie |
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Shifted the timing states so that cycle 0 is aligned with the positive edge of
any 2MHz CPU clock.
Made methods for various access timing tests and replaced the distinct access
variable with a test against the horizontal pixel counter (effectively using it
as a 2MHz cycle counter). |
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ULA.txt ula.py
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99:87b0ccdb9bc4
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2016-06-21 |
Paul Boddie |
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Refined and expanded the RAM access timings, moving data transfers to the
negative edge handler. |
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ULA.txt ula.py
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98:05ee520ae9d1
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2016-06-20 |
Paul Boddie |
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Renamed address to pixel_address. |
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ula.py
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97:5101ef5b3e3a
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2016-06-20 |
Paul Boddie |
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Added initial CPU abstraction support together with read/write selection and
PHI OUT clock signal generation. |
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ULA.txt ula.py
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