In all fairness, since the SPE was presented on Monday and the CELL processor itself was presented on Tuesday, CELL project members responsible for the SPE were not present for Tuesday eveningÂ’s chat sessions. As a result, the team members responsible for the overall CELL processor and internal system interconnects were asked to recall the meaning of acronyms of internal functional units within the SPE. Hence, the task was unnecessarily complicated by the absence of key personnel that would have been able to provide the answer faster than the CELL processor can rotate a million triangles by 12 degrees about the Z axis.
After some discussion (and more wine), it was determined that the ATO unit is most likely the Atomic (memory) unit responsible for coherency observation/interaction with dataflow on the EIB. Then, after the injection of more liquid refreshments (CH3CH2OH), it was theorized that the RTB most likely stood for some sort of Register Translation Block whose precise functionality was unknown to those outside of the SPE. However, this theory would turn out to be incorrect.