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Audio & Video.md
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@ -23,7 +23,7 @@ There are enough sprites supported to act as a third bitmap layer, should the pr
## Audio
The VERA FPGA core produces audio output in [I²S](https://en.wikipedia.org/wiki/I²S) format, which is fed to the A/V port for conversion into an analog or digital format suitable for the target display device.
The VERA FPGA core produces audio output in [I²S](https://en.wikipedia.org/wiki/I²S) format, which is fed to a compatible DAC to convert it to line-level analog stereo audio.
Audio is generated using a 16-voice stereo programmable sound generator, with each voice able to generate sounds independently, with the waveform for each chosen freely from among Pulse, Sawtooth, Triangle, and Noise.
@ -33,28 +33,25 @@ VERA also generates sampled 48KHz 16-bit stereo audio from a 4KB on-chip memory
The VERA implementation in Sentinel 65X has a dedicated vectored interrupt line to the CPU, which can be triggered by any or all of four conditions: Sprite collision, line number, PCM buffer status, or VSYNC.
## The Sentinel 65X A/V Port
## The A/V Port
Audio and video output in Sentinel 65X is directed to a pin header, which is connected to a small daughterboard which actually generates the final audio and video output signals, using electronics and connectors appropriate to the target display.
Audio and video output in Sentinel 65X is also directed to a pin header, to which can be connected any accessory which might make productive use of the R, G, B, HSYNC, VSYNC, and L/R analog audio signals.
### Pinout
The A/V port is a 24-pin female pin header, with a pin and row pitch of 2.54mm. The pinout of the port, as seen from above, is shown in the following table:
The A/V port is a 9-pin PTH footprint, with a pitch of 2.54mm. The pinout of the port, as seen from above, is shown in the following table:
| Pin | Label | | Label | Pin |
| :---: | :-----: | --- | :----: | :---: |
| 1 | +3.3V | | +5V | 2 |
| 3 | HSYNC | | VSYNC | 4 |
| 5 | RGB_R0 | | RGB_R1 | 6 |
| 7 | RGB_R2 | | RGB_R3 | 8 |
| 9 | RGB_G0 | | RGB_G1 | 10 |
| 11 | RGB_G2 | | RGB_G3 | 12 |
| 13 | RGB_B0 | | RGB_B1 | 14 |
| 15 | RGB_B2 | | RGB_B3 | 16 |
| 17 | LRCK | | BCK | 18 |
| 19 | ADATA | | SYSCLK | 20 |
| 21 | SCL | | SDA | 22 |
| 23 | GND | | GND | 24 |
| Pin | Label |
| :---: | :-----: |
| 1 | +5V |
| 2 | AUDIO_R |
| 3 | AUDIO_L |
| 4 | VSYNC |
| 5 | HSYNC |
| 6 | RED |
| 7 | GREEN |
| 8 | BLUE |
| 9 | GND |
## VERA Memory