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IOx R/W no longer qualified
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zuiko21 authored Apr 8, 2024
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Showing 1 changed file with 5 additions and 5 deletions.
10 changes: 5 additions & 5 deletions docs/hard/bus/iox.md
Original file line number Diff line number Diff line change
Expand Up @@ -27,7 +27,7 @@ connectors for testing purposes. If a board has more than one _IOx_ socket, they
| #| `BA1` | `PD2` |# |
| | `BA2` | `PD3` |# |
| | `BA3` | `PD4` |# |
| #| `/WE` | `PD5` |# |
| #| `/WR` | `PD5` |# |
| #| `/SEL` | `PD6` |# |
| #| `GND` | `PD7` |# |
| #| ##### | ##### |# |
Expand All @@ -41,12 +41,12 @@ Besides the IDC socket, Durango-X has a _right-angle pin socket_ for bigger peri

|Signal|Description|Direction (rel. CPU)|Notes|
|------|-----------|--------------------|-----|
|`+5V` |Power |Output |Most peripherals could take power from this line. _Maximum recommended power draw: **350 mA (combined)**_.|
|`GND` |Ground |Output |Mandatory connection, even is the peripheral is self-powered.|
|`+5V` |Power |Power Output |Most peripherals could take power from this line. _Maximum recommended power draw: **350 mA (combined)**_.|
|`GND` |**Ground** |Power Output |**Mandatory** connection, even is the peripheral is self-powered.|
|`PD0-PD7`|Peripheral Data Bus|Input/Output|**Must** be kept in _high-impedance_ state when `/SEL` is high.|
|`BA0-BA3`|Buffered Address Bus|Output |Constantly exposing the CPU's lower address bits.|
|`/WE` |Write Enable|Output |Either this _or_ `/SEL` **must** be _qualified_ via the Clock signal (usually the latter).|
|`/SEL`|IOx Select |Output |Active when the CPU interacts with the IOx bus.
|`/WE` |Write Enable|Output |_Active low_ when the CPU writes to the peripheral; **not** _qualified_, must be set around the same time as `BAx`.|
|`/SEL`|IOx Select |Output |_Active low_ when the CPU interacts with the IOx bus; **must** be _qualified_ via the Clock signal.|

!!! note

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