Peripheral Interface: Difference between revisions
PI_BB_GPIO
(Clarify more behavior of PI_BB_RD_LEN and PI_BB_WR_LEN) |
(PI_BB_GPIO) |
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Line 448:
: The busy bits in '''PI_STATUS''' also applies to these transfers.
: These transfers also trigger an interrupt upon completion. It is the same interrupt used for regular PI DMAs.
==== <span style="display:none;">0x0460 0060 - PI_BB_GPIO</code> ====
----
{{#invoke:Register table|head|800px|PI_BB_GPIO <code>0x0460 0060</code>}}
{{#invoke:Register table|row|31:24}}
| colspan="2"| R-? || U-? || U-? || U-? || colspan="2"| R-? || R-?
|-
| colspan="2"| Box ID [15:14] || — || — || — || colspan="2"| Box ID [10:9] || Box ID [8:6] [2]
{{#invoke:Register table|row|23:16}}
| colspan="2"| R-? || U-? || U-? || U-? || U-? || U-? || U-?
|-
| colspan="2"| Box ID [8:6] [1:0] || — || — || — || — || — || —
{{#invoke:Register table|row|15:8}}
| U-? || U-? || U-? || U-? || U-? || U-? || U-? || U-?
|-
| — || — || — || — || — || — || — || —
{{#invoke:Register table|row|7:0}}
| colspan="2"| W-? || W-? || W-? || colspan="2"| W-? || W-? || W-?
|-
| colspan="2"| RTC Mask || LED Mask || Power Mask || colspan="2"| RTC Control || LED Control || Power Control
{{#invoke:Register table|foot}}
{{#invoke:Register table|definitions
| 31-16 | Box ID [15:0] | System software calls this area the "Box ID". Various sub-fields are read out of this area separately for varying purposes.
| 31-30 | Box ID [15:14] | System software reads this as some sort of model identifier. Precise meaning unknown. Whether all players have the same value here is unknown.
| 26-25 | Box ID [10:9] | System clock speed identifier? System software reads this to determine delay intervals for some operations.
| 24-22 | Box ID [8:6] | The Boot ROM checks this against bits [10:8] in a register at MI+0x10, if they don't match this value is copied there and the system is rebooted?
| 7-6 | RTC Mask | Enables the RTC bit lines. If left off, changes to RTC Control will do nothing.
| 5 | LED Mask | Enables the LED bit line. If left off, changes to LED Control will do nothing.
| 4 | Power Mask | Enables the power control bit line. If left off, changes to Power Control will do nothing.
| 3-2 | RTC Control | RTC communication happens through these bits. Precise meaning not full understood.
| 1 | LED Control | If 1, the LED on the front of the player will light up. If 0, the LED will switch off.
| 0 | Power Control | If 1, the power will remain on. If 0, the device will power off.
}}
==== <span style="display:none;">0x0460 0070 - PI_BB_NAND_ADDR</code> ====
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