This is all going to depend on your bus topology, but assuming a non 'hub' design, it would go something like this.
1) CD-ROM to RAM via PCI 33MHz, 32bits wide, SDR. to memory bus 100/133MHz, 64/128bits wide, SDR/DDR
2) RAM to CPU via system bus 100/133MHz, 64/128bits wide, SDR/DDR/QDR
3) CPU to Video RAM via System to AGP bus 66MHz, 64bits wide, SDR
4) Video RAM to RAMDAC