This type of cable is a bit more complicated than the unbuffered one, although it is also fairly easy to construct. The cable most often used in this category is the so-called Wiggler cable. The Wiggler is a commercial cable sold by Macraigor Systems. With a list price of $150 USD they are not cheap. There is a schematic on the internet that is commonly accepted to be the equivalent of what's inside a Wiggler cable. This schematic, by Alec, was drawn up for devices that implement a typical EJTAG header in devices based on the ADM5120 System-on-Chip, another design based on the MIPS32 architecture. The ADM5120 has support for EJTAG v2.6, which does not support DMA transfers.