PI_CMD_RSP_K_NUM_ENTRIES
bp->cmd_rsp_reg.index.prod &= PI_CMD_RSP_K_NUM_ENTRIES-1;
bp->cmd_rsp_reg.index.comp &= PI_CMD_RSP_K_NUM_ENTRIES-1;
PI_RCV_DESCR cmd_rsp[PI_CMD_RSP_K_NUM_ENTRIES];