Pi Compute Module
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Rick Murray (539) 13447 posts |
Did you read the PDF I linked you to? Later (RiscPC era) cards use the middle row of pins. Plus the podules run at 5V logic and modern stuff at 3.3V… [and in some cases like parts of the Beagle, 1.8V!]
IOC – I/O chip, sort of Acorn’s version of a combined Northbridge/Southbridge. Pretty standard parts of a computer system. If you split the IOC up into different parts, then one could say the 6522s and µPD7002 are this on the Beeb, the MEMC is a lot of 74-series logic, and the video ULA/SAA5050/6845 are the GPU (really stretching the definition of “GPU”!).
Yup. Pretty standard fare for FHD-era media player devices: ARM core (that’s subservient to the GPU!), the GPU, MMUs, USB, SPIx3, IICx2, UARTx1½, DMA, GPIO, timers, SD interface, PCM/I2S audio, PWM… The Pi adds a heap of memory, Ethernet, and a USB hub. |
Dave Higton (1515) 3411 posts |
I should add that one aspect of my work is that the USB MIDI module’s API has moved even closer to the Acorn one in that the USB MIDI module now supports 4 ports (i.e. devices), same as Acorn. |
Dave Higton (1515) 3411 posts |
If you use a podule that requires the bus signals to be synchronous with one of the clock signals, you will find that it will occasionally malfunction because of metastability. It’s an extremely difficult problem to solve. |
Alain Lowet (7745) 40 posts |
oops, there was a typo in one of my comments, it’s not 45 but 54 GPIO’s that the compute module make available, but it is not sufficient for a full ‘IONYX’ podule connector implementation, that’s why i stick to a simple ARC (64 pins) podule interface with some enhancement in the middle row pins…(e.g. one of the GPIO’s will be used to toggle full backplane on/off of the bus, this will allow me to run other OS’s without risking to corrupt something attached to the backplane…) i already purchased this board for evaluation purposes: https://www.waveshare.com/compute-module-io-board-plus.htm, it is for me a good candidate to interface to the backplane… |
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