  The first version of digital low level RF (DLLRF) for the Diamond Light
Source storage ring and booster was developed with ALBA Synchrotron. Six
systems have been built so far. Two of them are in routine operation
controlling two normal conducting HOM-damped cavi-ties in the Diamond storage
ring. A third system is being used for cavity testing in the RF test facility
(RFTF). The fourth system is being commissioned to control the sec-ond normal
conducting booster cavity. The fifth DLLRF system is being prepared for the
third normal conducting RF cavity in the storage ring. A new DLLRF system based
on SIS8300-KU with RTM has been developed and tested in the last few years. We
are aiming to develop a common platform for the differ-ent RF systems in
Diamond, including the storage ring, the booster and the Linac. It will also be
our baseline design for the future Diamond II. Firmware, software and
supporting hardware have been developed and tested. The Linac version with
arbitrary waveform generator mode was tested successfully to generate flat top
pulse from SLED in the high power test in the Linac. The stor-age ring version
was also tested successfully in RFTF.
