Max JTAG clk for FT2232D device connected to OpenOCD

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Hi All,

Can someone tell me what the max JTAG clock rate is for this chip … I have set a JTAG speed of 100Mhz/8 (approx 12Mhz) in my .cfg file (after setting up the PLL on my LPC1766) and I find

that speed is being limited to 6000khz … is the FT2232D device doing this?

I thought that as each FT2232 channel was fed by a 48mhz clock, that we could get better than a 6Mhz JTAG clock out of it?

Thanks,

Bernie