Field Name             Bits   Default Description
DEADLOCK_CNTL          0      0x0     TCL/GA Deadlock control.
                                      POSSIBLE VALUES:
                                      00 - No effect.
                                      01 - Prevents TCL interface from deadlocking on GA side.
FASTSYNC_CNTL          1      0x1     Enables Fast register/primitive switching
                                      POSSIBLE VALUES:
                                      00 - No effect.
                                      01 - Enables high-performance register/primitive switching.
REG_READWRITE          2      0x0     R520+: When set, GA supports simultaneous register
                                      reads & writes
                                      POSSIBLE VALUES:
                                      00 - No effect.
                                      01 - Enables GA support of simultaneous register reads and writes.
REG_NOSTALL            3      0x0     POSSIBLE VALUES:
                                      00 - No effect.
                                      01 - Enables GA support of no-stall reads for register read back.