nec765.h (6728B) - Raw
1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1991 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * from: @(#)nec765.h 7.1 (Berkeley) 5/9/91 32 */ 33 34 /* 35 * Nec 765 floppy disc controller definitions 36 */ 37 38 /* Main status register */ 39 #define NE7_DAB 0x01 /* Diskette drive A is seeking, thus busy */ 40 #define NE7_DBB 0x02 /* Diskette drive B is seeking, thus busy */ 41 #define NE7_CB 0x10 /* Diskette Controller Busy */ 42 #define NE7_NDM 0x20 /* Diskette Controller in Non Dma Mode */ 43 #define NE7_DIO 0x40 /* Diskette Controller Data register I/O */ 44 #define NE7_RQM 0x80 /* Diskette Controller ReQuest for Master */ 45 46 /* Status register ST0 */ 47 #define NE7_ST0BITS "\020\010invld\007abnrml\006seek_cmplt\005equ_chck\004drive_notrdy\003top_head" 48 49 #define NE7_ST0_IC 0xc0 /* interrupt completion code */ 50 51 #define NE7_ST0_IC_RC 0xc0 /* terminated due to ready changed, n/a */ 52 #define NE7_ST0_IC_IV 0x80 /* invalid command; must reset FDC */ 53 #define NE7_ST0_IC_AT 0x40 /* abnormal termination, check error stat */ 54 #define NE7_ST0_IC_NT 0x00 /* normal termination */ 55 56 #define NE7_ST0_SE 0x20 /* seek end */ 57 #define NE7_ST0_EC 0x10 /* equipment check, recalibrated but no trk0 */ 58 #define NE7_ST0_NR 0x08 /* not ready (n/a) */ 59 #define NE7_ST0_HD 0x04 /* upper head selected */ 60 #define NE7_ST0_DR 0x03 /* drive code */ 61 62 /* Status register ST1 */ 63 #define NE7_ST1BITS "\020\010end_of_cyl\006bad_crc\005data_overrun\003sec_not_fnd\002write_protect\001no_am" 64 65 #define NE7_ST1_EN 0x80 /* end of cylinder, access past last record */ 66 #define NE7_ST1_DE 0x20 /* data error, CRC fail in ID or data */ 67 #define NE7_ST1_OR 0x10 /* DMA overrun, DMA failed to do i/o quickly */ 68 #define NE7_ST1_ND 0x04 /* no data, sector not found or CRC in ID f. */ 69 #define NE7_ST1_NW 0x02 /* not writeable, attempt to violate WP */ 70 #define NE7_ST1_MA 0x01 /* missing address mark (in ID or data field)*/ 71 72 /* Status register ST2 */ 73 #define NE7_ST2BITS "\020\007ctrl_mrk\006bad_crc\005wrong_cyl\004scn_eq\003scn_not_fnd\002bad_cyl\001no_dam" 74 75 #define NE7_ST2_CM 0x40 /* control mark; found deleted data */ 76 #define NE7_ST2_DD 0x20 /* data error in data field, CRC fail */ 77 #define NE7_ST2_WC 0x10 /* wrong cylinder, ID field mismatches cmd */ 78 #define NE7_ST2_SH 0x08 /* scan equal hit */ 79 #define NE7_ST2_SN 0x04 /* scan not satisfied */ 80 #define NE7_ST2_BC 0x02 /* bad cylinder, cylinder marked 0xff */ 81 #define NE7_ST2_MD 0x01 /* missing address mark in data field */ 82 83 /* Status register ST3 */ 84 #define NE7_ST3BITS "\020\010fault\007write_protect\006drdy\005tk0\004two_side\003side_sel\002" 85 86 #define NE7_ST3_FT 0x80 /* fault; PC: n/a */ 87 #define NE7_ST3_WP 0x40 /* write protected */ 88 #define NE7_ST3_RD 0x20 /* ready; PC: always true */ 89 #define NE7_ST3_T0 0x10 /* track 0 */ 90 #define NE7_ST3_TS 0x08 /* two-sided; PC: n/a */ 91 #define NE7_ST3_HD 0x04 /* upper head select */ 92 #define NE7_ST3_US 0x03 /* unit select */ 93 94 /* Data Rate Select Register DSR (enhanced controller) */ 95 #define I8207X_DSR_SR 0x80 /* software reset */ 96 #define I8207X_DSR_LP 0x40 /* low power */ 97 #define I8207X_DSR_PS 0x1c /* precompensation select */ 98 #define I8207X_DSR_RS 0x03 /* data rate select */ 99 100 /* Commands */ 101 /* 102 * the top three bits -- where appropriate -- are set as follows: 103 * 104 * MT - multi-track; allow both sides to be handled in single cmd 105 * MFM - modified frequency modulation; use MFM encoding 106 * SK - skip; skip sectors marked as "deleted" 107 */ 108 109 #define NE7CMD_MT 0x80 /* READ, WRITE, WRITEDEL, READDEL, SCAN* */ 110 #define NE7CMD_MFM 0x40 /* same as MT, plus READTRK, READID, FORMAT */ 111 #define NE7CMD_SK 0x20 /* READ, READDEL, SCAN* */ 112 113 #define NE7CMD_READTRK 0x02 /* read whole track */ 114 #define NE7CMD_SPECIFY 0x03 /* specify drive parameters - requires unit 115 * parameters byte */ 116 #define NE7CMD_SENSED 0x04 /* sense drive - requires unit select byte */ 117 #define NE7CMD_WRITE 0x05 /* write - requires eight additional bytes */ 118 #define NE7CMD_READ 0x06 /* read - requires eight additional bytes */ 119 #define NE7CMD_RECAL 0x07 /* recalibrate drive - requires 120 * unit select byte */ 121 #define NE7CMD_SENSEI 0x08 /* sense controller interrupt status */ 122 #define NE7CMD_WRITEDEL 0x09 /* write deleted data */ 123 #define NE7CMD_READID 0x0a /* read ID field */ 124 #define NE7CMD_READDEL 0x0c /* read deleted data */ 125 #define NE7CMD_FORMAT 0x0d /* format - requires five additional bytes */ 126 #define NE7CMD_SEEK 0x0f /* seek drive - requires unit select byte 127 * and new cyl byte */ 128 #define NE7CMD_VERSION 0x10 /* get version */ 129 #define NE7CMD_SCNEQU 0x11 /* scan equal */ 130 #define NE7CMD_SCNLE 0x19 /* scan less or equal */ 131 #define NE7CMD_SCNGE 0x1d /* scan greater or equal */ 132 133 /* 134 * Enhanced controller commands: 135 */ 136 #define I8207X_DUMPREG 0x0e /* dump internal registers */ 137 #define I8207X_CONFIG 0x13 /* configure enhanced features */ 138 139 /* 140 * "specify" definitions 141 * 142 * acronyms (times are relative to a FDC clock of 8 MHz): 143 * srt - step rate; PC usually 3 ms 144 * hut - head unload time; PC usually maximum of 240 ms 145 * hlt - head load time; PC usually minimum of 2 ms 146 * nd - no DMA flag; PC usually not set (0) 147 */ 148 149 #define NE7_SPEC_1(srt, hut) (((16 - (srt)) << 4) | (((hut) / 16))) 150 #define NE7_SPEC_2(hlt, nd) (((hlt) & 0xFE) | ((nd) & 1))