RDRAM: Difference between revisions
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(Add MinInterval Register description) |
(SpecFunc commands) |
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| MAD[1] || MRD[1] || MWD[1] || — || — || — || — || — |
| MAD[1] || MRD[1] || MWD[1] || — || — || — || — || — |
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{{#invoke:Register table|row|7:0}} |
{{#invoke:Register table|row|7:0}} |
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| R-1 || R-1 || R-1 || W- |
| R-1 || R-1 || R-1 || W-0 || W-0 || W-0 || W-0 || W-0 |
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| MAD[0] || MRD[0] || MWD[0] || colspan="5" | SpecFunc[4:0] |
| MAD[0] || MRD[0] || MWD[0] || colspan="5" | SpecFunc[4:0] |
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| 30,22,14,6 | MinReadDelay | Minimum of ReadDelay of RDRAM. |
| 30,22,14,6 | MinReadDelay | Minimum of ReadDelay of RDRAM. |
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| 29,21,13,5 | MinWriteDelay | Minimum of WriteDelay of RDRAM. |
| 29,21,13,5 | MinWriteDelay | Minimum of WriteDelay of RDRAM. |
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| 4-0 | SpecFunc | Performs |
| 4-0 | SpecFunc | Performs various commands when written, see table below. |
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}} |
}} |
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As SpecFunc is the only writable field in the register, you can just write the command. |
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'''SpecFunc Commands:''' |
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{| |
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| <code>00000</code> || - '''Nop''' || - Do nothing |
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| <code>xxxx1</code> || - '''SetRR''' ||- Manual refresh. The device immediately preforms a single a burst refresh of two rows per bank |
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| <code>x0x10</code> || - '''ClrRE''' || - Disable automatic refresh |
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| <code>x01xx</code> || - '''SetPD''' || - Enter the powerdown state |
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| <code>×1x0x</code> || - '''SetRE''' || - Enable automatic refresh |
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| <code>1xxxx</code> || colspan="2" | - '''Reserved''' |
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|} |
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''The N64 implements refresh by broadcasting one SetRR command whenever VI emits a horizontal sync pulse.'' |
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= RDRAM addressing = |
= RDRAM addressing = |
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