forked from Apple-2-HW/ssc
25 lines
487 B
Plaintext
25 lines
487 B
Plaintext
GAL22V10
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SSC
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/RES CTS /IOSTRB /DEVSEL /IOSEL RWB A11 A10 A9 A8 A3 GND
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NC NC NC /LATCHCE ROMA8 ROMA9 ROMA10 /ROMOE PHI2 D0 C8EN VCC
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PHI2 = DEVSEL
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C8EN = C8EN * /A8 * /A9 * /A10 * /A11 * /IOSTRB * /RES
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+ IOSEL
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ROMOE = C8EN * IOSTRB * RWB
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+ IOSEL * RWB
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ROMA8 = A8 + /A11
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ROMA9 = A9 + /A11
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ROMA10 = A10 + /A11
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D0.T = CTS
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D0.E = RWB * DEVSEL * /A3
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LATCHCE = DEVSEL + IOSEL + IOSTRB
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DESCRIPTION
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This implements all of the address decoding logic for the Simple Serial Card.
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