  A LLRF control and data acquisition system for the 8-cavity cryomodule1 at
the ILCTA has been implemented using three 33-channel ADC boards in a VXI
mainframe. One card each is dedicated to the cavity probes for vector control,
forward power and reverse power measurements. The system is scalable to 24
cavities or more with the commissioning of cryomodules 2 and 3 without
additional hardware. The signal processing and vector control of the cavities
is implemented in an FPGA and a high speed data acquisition system with up to
100 channels which stores data in external SDRAM memory. The system supports
both pulsed and CW modes with a pulse rate of 5 Hz. Acquired data is
transferred between pulses to auxiliary systems such as the piezo controller
through the VXI slot0 controller. The performance of the vector control system
is evaluated and the design of the system is described.
