we used at the university, a dspcard, what they (a teacher) designed, and said us, that method. i do not know about any materials in things like that. i looked for similar things, but everywhere are just teorethical papers, and books.
here is an assembly project for that card. a littlebit bugy, and you cannot use without this card. i do not have schematics about the card. it is a PC oscilloscope.
in the szkop.asm , you will find some things. in the card is a TMS320VC5402-100 DSP, and an ADC, up to 1,5MHz. i do not know the type of that, and more about that card.
i think it is very simple. just use a 3state bus driver, an address decoder (FPGA, CPLD), and connect the adc's data lines, with the bus driver to the DSP's external bus if. and the address decoder will control the bus-drv, and the adc's sampling pin, in another addresses case. this 2 addresses thing -what i wrote- is not in the adc, but in the card
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i tried to upload/attach a zip file, but i do not see it.