1 /* 2 * Copyright (c) 1982, 1986 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 * 6 * @(#)dhreg.h 7.1 (Berkeley) 06/05/86 7 */ 8 9 /* 10 * DH-11 device register definitions. 11 */ 12 struct dhdevice { 13 union { 14 short dhcsr; /* control-status register */ 15 char dhcsrl; /* low byte for line select */ 16 } un; 17 short dhrcr; /* receive character register */ 18 short dhlpr; /* line parameter register */ 19 u_short dhcar; /* current address register */ 20 short dhbcr; /* byte count register */ 21 u_short dhbar; /* buffer active register */ 22 short dhbreak; /* break control register */ 23 short dhsilo; /* silo status register */ 24 }; 25 26 /* Bits in dhcsr */ 27 #define DH_TI 0100000 /* transmit interrupt */ 28 #define DH_SI 0040000 /* storage interrupt */ 29 #define DH_TIE 0020000 /* transmit interrupt enable */ 30 #define DH_SIE 0010000 /* storage interrupt enable */ 31 #define DH_MC 0004000 /* master clear */ 32 #define DH_NXM 0002000 /* non-existant memory */ 33 #define DH_MM 0001000 /* maintenance mode */ 34 #define DH_CNI 0000400 /* clear non-existant memory interrupt */ 35 #define DH_RI 0000200 /* receiver interrupt */ 36 #define DH_RIE 0000100 /* receiver interrupt enable */ 37 38 /* Bits in dhlpr */ 39 #define BITS6 01 40 #define BITS7 02 41 #define BITS8 03 42 #define TWOSB 04 43 #define PENABLE 020 44 /* DEC manuals incorrectly say this bit causes generation of even parity. */ 45 #define OPAR 040 46 #define HDUPLX 040000 47 48 #define DH_IE (DH_TIE|DH_SIE|DH_RIE) 49 50 /* Bits in dhrcr */ 51 #define DH_PE 0010000 /* parity error */ 52 #define DH_FE 0020000 /* framing error */ 53 #define DH_DO 0040000 /* data overrun */ 54