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2025-12-03 19:10:16 +01:00
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notes/cpu.md
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@@ -6,5 +6,11 @@
- ROM: [AT28C64B](../datasheets/AT28C64B.pdf)
- Register: [74HC377](../datasheets/74HC_HCT377.pdf)
## Register
- Address 0x5FFF/0b0101_1111_1111_1111
- decode using [74HC20](../datasheets/74HC20.pdf), [74HC00](../datasheets/74hc00.pdf)
- $b_{15},\dots,b_0$
- $\overline E=\neg(b_0\land b_1\land b_2\land b_3)\land\neg(b_4\land b_5\land b_6\land b_7)\land\neg(b_8\land b_9\land b_{10}\land b_{11})\land\neg(b_{12}\land b_{14})\land (b_{13}\lor b_{15})$
## Timings
- PHI2 target: 10MHz -> 100ns