doc_register_readw
dps0_low = doc_register_readw(docg3, DOC_DPS0_ADDRLOW);
dps0_high = doc_register_readw(docg3, DOC_DPS0_ADDRHIGH);
dps1_low = doc_register_readw(docg3, DOC_DPS1_ADDRLOW);
dps1_high = doc_register_readw(docg3, DOC_DPS1_ADDRHIGH);
chip_id = doc_register_readw(docg3, DOC_CHIPID);
chip_id_inv = doc_register_readw(docg3, DOC_CHIPID_INV);