1 /* $NetBSD: smc83c170reg.h,v 1.14 2024/02/09 22:08:34 andvar Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #ifndef _DEV_IC_SMC83C170REG_H_ 34 #define _DEV_IC_SMC83C170REG_H_ 35 36 /* 37 * Register description for the Standard Microsystems Corp. 83C170 38 * Ethernet PCI Integrated Controller (EPIC/100). 39 */ 40 41 /* 42 * EPIC transmit descriptor. Must be 4-byte aligned. 43 */ 44 struct epic_txdesc { 45 volatile uint32_t et_txstatus; /* transmit status; see below */ 46 volatile uint32_t et_bufaddr; /* buffer address */ 47 volatile uint32_t et_control; /* control word; see below */ 48 volatile uint32_t et_nextdesc; /* next descriptor pointer */ 49 }; 50 51 /* et_txstatus */ 52 #define TXSTAT_TXLENGTH_SHIFT 16 /* TX length in higher 16bits */ 53 #define TXSTAT_TXLENGTH(x) ((x) << TXSTAT_TXLENGTH_SHIFT) 54 55 #define ET_TXSTAT_OWNER 0x8000 /* NIC owns descriptor */ 56 #define ET_TXSTAT_COLLMASK 0x1f00 /* collisions */ 57 #define ET_TXSTAT_DEFERRING 0x0080 /* deferring due to jabber */ 58 #define ET_TXSTAT_OOWCOLL 0x0040 /* out of window collision */ 59 #define ET_TXSTAT_CDHB 0x0020 /* collision detect heartbeat */ 60 #define ET_TXSTAT_UNDERRUN 0x0010 /* DMA underrun */ 61 #define ET_TXSTAT_CARSENSELOST 0x0008 /* carrier lost */ 62 #define ET_TXSTAT_TXWITHCOLL 0x0004 /* encountered collisions during tx */ 63 #define ET_TXSTAT_NONDEFERRED 0x0002 /* transmitted without deferring */ 64 #define ET_TXSTAT_PACKETTX 0x0001 /* packet transmitted successfully */ 65 66 #define TXSTAT_COLLISIONS(x) (((x) & ET_TXSTAT_COLLMASK) >> 8) 67 68 /* et_control */ 69 #define TXCTL_BUFLENGTH_MASK 0x0000ffff /* buf length in lower 16bits */ 70 #define TXCTL_BUFLENGTH(x) ((x) & TXCTL_BUFLENGTH_MASK) 71 72 #define ET_TXCTL_LASTDESC 0x00100000 /* last descriptor in frame */ 73 #define ET_TXCTL_NOCRC 0x00080000 /* disable CRC generation */ 74 #define ET_TXCTL_IAF 0x00040000 /* interrupt after frame */ 75 #define ET_TXCTL_LFFORM 0x00020000 /* alternate fraglist format */ 76 #define ET_TXCTL_FRAGLIST 0x00010000 /* descriptor points to fraglist */ 77 78 /* 79 * EPIC receive descriptor. Must be 4-byte aligned. 80 */ 81 struct epic_rxdesc { 82 volatile uint32_t er_rxstatus; /* receive status; see below */ 83 volatile uint32_t er_bufaddr; /* buffer address */ 84 volatile uint32_t er_control; /* control word; see below */ 85 volatile uint32_t er_nextdesc; /* next descriptor pointer */ 86 }; 87 88 /* er_rxstatus */ 89 #define RXSTAT_RXLENGTH_SHIFT 16 /* TX length in higher 16bits */ 90 #define RXSTAT_RXLENGTH(x) ((x) >> RXSTAT_RXLENGTH_SHIFT) 91 92 #define ER_RXSTAT_OWNER 0x8000 /* NIC owns descriptor */ 93 #define ER_RXSTAT_HDRCOPIED 0x4000 /* rx status posted after hdr copy */ 94 #define ER_RXSTAT_FRAGLISTERR 0x2000 /* ran out of frags to copy frame */ 95 #define ER_RXSTAT_NETSTATVALID 0x1000 /* length and status are valid */ 96 #define ER_RXSTAT_RCVRDIS 0x0040 /* receiver disabled */ 97 #define ER_RXSTAT_BCAST 0x0020 /* broadcast address recognized */ 98 #define ER_RXSTAT_MCAST 0x0010 /* multicast address recognized */ 99 #define ER_RXSTAT_MISSEDPKT 0x0008 /* missed packet */ 100 #define ER_RXSTAT_CRCERROR 0x0004 /* EPIC or MII asserted CRC error */ 101 #define ER_RXSTAT_ALIGNERROR 0x0002 /* frame not byte-aligned */ 102 #define ER_RXSTAT_PKTINTACT 0x0001 /* packet received without error */ 103 104 /* er_control */ 105 #define RXCTL_BUFLENGTH_MASK 0x0000ffff /* buf length in lower 16bits */ 106 #define RXCTL_BUFLENGTH(x) ((x) & RXCTL_BUFLENGTH_MASK) 107 108 #define ER_RXCTL_HEADER 0x00040000 /* descriptor is for hdr copy */ 109 #define ER_RXCTL_LFFORM 0x00020000 /* alternate fraglist format */ 110 #define ER_RXCTL_FRAGLIST 0x00010000 /* descriptor points to fraglist */ 111 112 /* 113 * This is not really part of the register description, but we need 114 * to define the number of transmit fragments *somewhere*. 115 */ 116 #define EPIC_NFRAGS 16 /* maximum number of frags in list */ 117 118 /* 119 * EPIC fraglist descriptor. 120 */ 121 struct epic_fraglist { 122 volatile uint32_t ef_nfrags; /* number of frags in list */ 123 struct { 124 volatile uint32_t ef_addr; /* address of frag */ 125 volatile uint32_t ef_length; /* length of frag */ 126 } ef_frags[EPIC_NFRAGS]; 127 }; 128 129 /* 130 * EPIC control registers. 131 */ 132 133 #define EPIC_COMMAND 0x00 /* COMMAND */ 134 #define COMMAND_TXUGO 0x00000080 /* start tx after underrun */ 135 #define COMMAND_STOP_RDMA 0x00000040 /* stop rx dma */ 136 #define COMMAND_STOP_TDMA 0x00000020 /* stop tx dma */ 137 #define COMMAND_NEXTFRAME 0x00000010 /* move onto next rx frame */ 138 #define COMMAND_RXQUEUED 0x00000008 /* queue a rx descriptor */ 139 #define COMMAND_TXQUEUED 0x00000004 /* queue a tx descriptor */ 140 #define COMMAND_START_RX 0x00000002 /* start receiver */ 141 #define COMMAND_STOP_RX 0x00000001 /* stop receiver */ 142 143 #define EPIC_INTSTAT 0x04 /* INTERRUPT STATUS */ 144 #define INTSTAT_PTA 0x08000000 /* PCI target abort */ 145 #define INTSTAT_PMA 0x04000000 /* PCI master abort */ 146 #define INTSTAT_APE 0x02000000 /* PCI address parity error */ 147 #define INTSTAT_DPE 0x01000000 /* PCI data parity error */ 148 #define INTSTAT_RSV 0x00800000 /* rx status valid */ 149 #define INTSTAT_RCTS 0x00400000 /* rx copy threshold status */ 150 #define INTSTAT_RBE 0x00200000 /* rx buffers empty */ 151 #define INTSTAT_TCIP 0x00100000 /* tx copy in progress */ 152 #define INTSTAT_RCIP 0x00080000 /* rx copy in progress */ 153 #define INTSTAT_TXIDLE 0x00040000 /* transmit idle */ 154 #define INTSTAT_RXIDLE 0x00020000 /* receive idle */ 155 #define INTSTAT_INT_ACTV 0x00010000 /* interrupt active */ 156 #define INTSTAT_GP2_INT 0x00008000 /* gpio2 low (PHY event) */ 157 #define INTSTAT_FATAL_INT 0x00001000 /* fatal error occurred */ 158 #define INTSTAT_RCT 0x00000800 /* rx copy threshold crossed */ 159 #define INTSTAT_PREI 0x00000400 /* preemptive interrupt */ 160 #define INTSTAT_CNT 0x00000200 /* counter overflow */ 161 #define INTSTAT_TXU 0x00000100 /* transmit underrun */ 162 #define INTSTAT_TQE 0x00000080 /* transmit queue empty */ 163 #define INTSTAT_TCC 0x00000040 /* transmit chain complete */ 164 #define INTSTAT_TXC 0x00000020 /* transmit complete */ 165 #define INTSTAT_RXE 0x00000010 /* receive error */ 166 #define INTSTAT_OVW 0x00000008 /* rx buffer overflow */ 167 #define INTSTAT_RQE 0x00000004 /* receive queue empty */ 168 #define INTSTAT_HCC 0x00000002 /* header copy complete */ 169 #define INTSTAT_RCC 0x00000001 /* receive copy complete */ 170 171 #define EPIC_INTMASK 0x08 /* INTERRUPT MASK */ 172 /* Bits 0-15 enable the corresponding interrupt in INTSTAT. */ 173 174 #define EPIC_GENCTL 0x0c /* GENERAL CONTROL */ 175 #define GENCTL_RESET_PHY 0x00004000 /* reset PHY */ 176 #define GENCTL_SOFT1 0x00002000 /* software use */ 177 #define GENCTL_SOFT0 0x00001000 /* software use */ 178 #define GENCTL_MEM_READ_CTL1 0x00000800 /* PCI memory control */ 179 #define GENCTL_MEM_READ_CTL0 0x00000400 /* (see below) */ 180 #define GENCTL_RX_FIFO_THRESH1 0x00000200 /* rx fifo thresh */ 181 #define GENCTL_RX_FIFO_THRESH0 0x00000100 /* (see below) */ 182 #define GENCTL_BIG_ENDIAN 0x00000020 /* big endian mode */ 183 #define GENCTL_ONECOPY 0x00000010 /* auto-NEXTFRAME */ 184 #define GENCTL_POWERDOWN 0x00000008 /* powersave sleep mode */ 185 #define GENCTL_SOFTINT 0x00000004 /* software-generated intr */ 186 #define GENCTL_INTENA 0x00000002 /* interrupt enable */ 187 #define GENCTL_SOFTRESET 0x00000001 /* initialize EPIC */ 188 189 /* 190 * Explanation of MEMORY READ CONTROL: 191 * 192 * These bits control which PCI command the transmit DMA will use when 193 * bursting data over the PCI bus. When CTL1 is set, the transmit DMA 194 * will use the PCI "memory read line" command. When CTL0 is set, the 195 * transmit DMA will use the PCI "memory read multiple" command. When 196 * neither bit is set, the transmit DMA will use the "memory read" command. 197 * Use of "memory read line" or "memory read multiple" may enhance 198 * performance on some systems. 199 */ 200 201 /* 202 * Explanation of RECEIVE FIFO THRESHOLD: 203 * 204 * Controls the level at which the PCI burst state machine begins to 205 * empty the receive FIFO. Default is "1/2 full" (0,1). 206 * 207 * 0,0 1/4 full 32 bytes 208 * 0,1 1/2 full 64 bytes 209 * 1,0 3/4 full 96 bytes 210 * 1,1 full 128 bytes 211 */ 212 213 #define EPIC_NVCTL 0x10 /* NON-VOLATILE CONTROL */ 214 #define NVCTL_IPG_DLY_MASK 0x00000780 /* interpacket delay gap */ 215 #define NVCTL_CB_MODE 0x00000040 /* CardBus mode */ 216 #define NVCTL_GPIO2 0x00000020 /* general purpose i/o */ 217 #define NVCTL_GPIO1 0x00000010 /* ... */ 218 #define NVCTL_GPOE2 0x00000008 /* general purpose output ena */ 219 #define NVCTL_GPOE1 0x00000004 /* ... */ 220 #define NVCTL_CLKRUNSUPP 0x00000002 /* clock run supported */ 221 #define NVCTL_ENAMEMMAP 0x00000001 /* enable memory map */ 222 223 #define NVCTL_IPG_DLY(x) (((x) & NVCTL_IPG_DLY_MASK) >> 7) 224 225 #define EPIC_EECTL 0x14 /* EEPROM CONTROL */ 226 #define EECTL_EEPROMSIZE 0x00000040 /* eeprom size; see below */ 227 #define EECTL_EERDY 0x00000020 /* eeprom ready */ 228 #define EECTL_EEDO 0x00000010 /* eeprom data out (from) */ 229 #define EECTL_EEDI 0x00000008 /* eeprom data in (to) */ 230 #define EECTL_EESK 0x00000004 /* eeprom clock */ 231 #define EECTL_EECS 0x00000002 /* eeprom chip select */ 232 #define EECTL_ENABLE 0x00000001 /* eeprom enable */ 233 234 /* 235 * Explanation of EEPROM SIZE: 236 * 237 * Indicates the size of the serial EEPROM: 238 * 239 * 1 16x16 or 64x16 240 * 0 128x16 or 256x16 241 */ 242 243 /* 244 * Serial EEPROM opcodes, including start bit: 245 */ 246 #define EPIC_EEPROM_OPC_WRITE 0x05 247 #define EPIC_EEPROM_OPC_READ 0x06 248 249 #define EPIC_PBLCNT 0x18 /* PBLCNT */ 250 #define PBLCNT_MASK 0x0000003f /* programmable burst length */ 251 252 #define EPIC_TEST 0x1c /* TEST */ 253 #define TEST_CLOCKTEST 0x00000008 254 255 #define EPIC_CRCCNT 0x20 /* CRC ERROR COUNTER */ 256 #define CRCCNT_MASK 0x0000000f /* crc errs since last read */ 257 258 #define EPIC_ALICNT 0x24 /* FRAME ALIGNMENT ERROR COUNTER */ 259 #define ALICNT_MASK 0x0000000f /* align errs since last read */ 260 261 #define EPIC_MPCNT 0x28 /* MISSED PACKET COUNTER */ 262 #define MPCNT_MASK 0x0000000f /* miss. pkts since last read */ 263 264 #define EPIC_RXFIFO 0x2c 265 266 #define EPIC_MMCTL 0x30 /* MII MANAGEMENT INTERFACE CONTROL */ 267 #define MMCTL_PHY_ADDR_MASK 0x00003e00 /* phy address field */ 268 #define MMCTL_PHY_REG_ADDR_MASK 0x000001f0 /* phy register address field */ 269 #define MMCTL_RESPONDER 0x00000008 /* phy responder */ 270 #define MMCTL_WRITE 0x00000002 /* write to phy */ 271 #define MMCTL_READ 0x00000001 /* read from phy */ 272 273 #define MMCTL_ARG(phy, reg, cmd) (((phy) << 9) | ((reg) << 4) | (cmd)) 274 275 #define EPIC_MMDATA 0x34 /* MII MANAGEMENT INTERFACE DATA */ 276 #define MMDATA_MASK 0x0000ffff /* MII frame data */ 277 278 #define EPIC_MIICFG 0x38 /* MII CONFIGURATION */ 279 #define MIICFG_ALTDIR 0x00000080 /* alternate direction */ 280 #define MIICFG_ALTDATA 0x00000040 /* alternate data */ 281 #define MIICFG_ALTCLOCK 0x00000020 /* alternate clock source */ 282 #define MIICFG_ENASER 0x00000010 /* enable serial manag intf */ 283 #define MIICFG_PHYPRESENT 0x00000008 /* phy present on MII */ 284 #define MIICFG_LINKSTATUS 0x00000004 /* 694 link status */ 285 #define MIICFG_ENABLE 0x00000002 /* enable 694 */ 286 #define MIICFG_SERMODEENA 0x00000001 /* serial mode enable */ 287 288 #define EPIC_IPG 0x3c /* INTERPACKET GAP */ 289 #define IPG_INTERFRAME_MASK 0x00007f00 /* interframe gap time */ 290 #define IPG_INTERPKT_MASK 0x000000ff /* interpacket gap time */ 291 292 #define EPIC_LAN0 0x40 /* LAN ADDRESS */ 293 294 #define EPIC_LAN1 0x44 295 296 #define EPIC_LAN2 0x48 297 298 #define LANn_MASK 0x0000ffff 299 300 /* 301 * Explanation of LAN ADDRESS registers: 302 * 303 * LAN address is described as: 304 * 305 * 0000 [n1][n0][n3][n2] | 0000 [n5][n4][n7][n6] | 0000 [n9][n8][n11][n10] 306 * 307 * n == one nibble, mapped as follows: 308 * 309 * LAN0 [15-12] n3 310 * LAN0 [11-8] n2 311 * LAN0 [7-4] n1 312 * LAN0 [3-0] n0 313 * LAN1 [15-12] n7 314 * LAN1 [11-8] n6 315 * LAN1 [7-4] n5 316 * LAN1 [3-0] n4 317 * LAN2 [15-12] n11 318 * LAN2 [11-8] n10 319 * LAN2 [7-4] n9 320 * LAN2 [3-0] n8 321 * 322 * The LAN address is automatically recalled from the EEPROM after a 323 * hard reset. 324 */ 325 326 #define EPIC_IDCHK 0x4c /* BOARD ID/CHECKSUM */ 327 #define IDCHK_ID_MASK 0x0000ff00 /* board ID */ 328 #define IDCHK_CKSUM_MASK 0x000000ff /* checksum (should be 0xff) */ 329 330 #define EPIC_MC0 0x50 /* MULTICAST ADDRESS HASH TABLE */ 331 332 #define EPIC_MC1 0x54 333 334 #define EPIC_MC2 0x58 335 336 #define EPIC_MC3 0x5c 337 338 /* 339 * Explanation of MULTICAST ADDRESS HASH TABLE registers: 340 * 341 * Bits in the hash table are encoded as follows: 342 * 343 * MC0 [15-0] 344 * MC1 [31-16] 345 * MC2 [47-32] 346 * MC3 [53-48] 347 */ 348 349 #define EPIC_RXCON 0x60 /* RECEIVE CONTROL */ 350 #define RXCON_EXTBUFSIZESEL1 0x00000200 /* ext buf size; see below */ 351 #define RXCON_EXTBUFSIZESEL0 0x00000100 /* ... */ 352 #define RXCON_EARLYRXENABLE 0x00000080 /* early receive enable */ 353 #define RXCON_MONITORMODE 0x00000040 /* monitor mode */ 354 #define RXCON_PROMISCMODE 0x00000020 /* promiscuous mode */ 355 #define RXCON_RXINVADDR 0x00000010 /* rx inv individual addr */ 356 #define RXCON_RXMULTICAST 0x00000008 /* receive multicast */ 357 #define RXCON_RXBROADCAST 0x00000004 /* receive broadcast */ 358 #define RXCON_RXRUNT 0x00000002 /* receive runt frames */ 359 #define RXCON_SAVEERRPKTS 0x00000001 /* save errored packets */ 360 361 /* 362 * Explanation of EXTERNAL BUFFER SIZE SELECT: 363 * 364 * 0,0 external buffer access is disabled 365 * 0,1 16k 366 * 1,0 32k 367 * 1,1 128k 368 */ 369 370 #define EPIC_RXSTAT 0x64 /* RECEIVE STATUS */ 371 372 #define EPIC_RXCNT 0x68 373 374 #define EPIC_RXTEST 0x6c 375 376 #define EPIC_TXCON 0x70 /* TRANSMIT CONTROL */ 377 #define TXCON_SLOTTIME_MASK 0x000000f8 /* slot time */ 378 #define TXCON_LOOPBACK_D2 0x00000004 /* loopback mode bit 2 */ 379 #define TXCON_LOOPBACK_D1 0x00000002 /* loopback mode bit 1 */ 380 #define TXCON_EARLYTX_ENABLE 0x00000001 /* early transmit enable */ 381 382 /* 383 * Explanation of LOOPBACK MODE BIT: 384 * 385 * 0,0 normal operation 386 * 0,1 internal loopback (before PHY) 387 * 1,0 external loopback (after PHY) 388 * 1,1 full duplex - decouples transmit and receive blocks 389 */ 390 391 #define EPIC_TXSTAT 0x74 /* TRANSMIT STATUS */ 392 393 #define EPIC_TDPAR 0x78 394 395 #define EPIC_TXTEST 0x7c 396 397 #define EPIC_PRFDAR 0x80 398 399 #define EPIC_PRCDAR 0x84 /* PCI RECEIVE CURRENT DESCRIPTOR ADDR */ 400 401 #define EPIC_PRHDAR 0x88 402 403 #define EPIC_PRFLAR 0x8c 404 405 #define EPIC_PRDLGTH 0x90 406 407 #define EPIC_PRFCNT 0x94 408 409 #define EPIC_PRLCAR 0x98 410 411 #define EPIC_PRLPAR 0x9c 412 413 #define EPIC_PREFAR 0xa0 414 415 #define EPIC_PRSTAT 0xa4 /* PCI RECEIVE DMA STATUS */ 416 417 #define EPIC_PRBUF 0xa8 418 419 #define EPIC_RDNCAR 0xac 420 421 #define EPIC_PRCPTHR 0xb0 /* PCI RECEIVE COPY THRESHOLD */ 422 423 #define EPIC_ROMDATA 0xb4 424 425 #define EPIC_PREEMPR 0xbc 426 427 #define EPIC_PTFDAR 0xc0 428 429 #define EPIC_PTCDAR 0xc4 /* PCI TRANSMIT CURRENT DESCRIPTOR ADDR */ 430 431 #define EPIC_PTHDAR 0xc8 432 433 #define EPIC_PTFLAR 0xcc 434 435 #define EPIC_PTDLGTH 0xd0 436 437 #define EPIC_PTFCNT 0xd4 438 439 #define EPIC_PTLCAR 0xd8 440 441 #define EPIC_ETXTHR 0xdc /* EARLY TRANSMIT THRESHOLD */ 442 443 #define EPIC_PTETXC 0xe0 444 445 #define EPIC_PTSTAT 0xe4 446 447 #define EPIC_PTBUF 0xe8 448 449 #define EPIC_PTFDAR2 0xec 450 451 #define EPIC_FEVTR 0xf0 /* FEVTR (CardBus) */ 452 453 #define EPIC_FEVTRMSKR 0xf4 /* FEVTRMSKR (CardBus) */ 454 455 #define EPIC_FPRSTSTR 0xf8 /* FPRSTR (CardBus) */ 456 457 #define EPIC_FFRCEVTR 0xfc /* PPRCEVTR (CardBus) */ 458 459 /* 460 * EEPROM format: 461 * 462 * Word Bits Description 463 * ---- ---- ----------- 464 * 0 7-0 LAN Address Byte 0 465 * 0 15-8 LAN Address Byte 1 466 * 1 7-0 LAN Address Byte 2 467 * 1 15-8 LAN Address Byte 3 468 * 2 7-0 LAN Address Byte 4 469 * 2 15-8 LAN Address Byte 5 470 * 3 7-0 Board ID 471 * 3 15-8 Checksum 472 * 4 5-0 Non-Volatile Control Register Contents 473 * 5 7-0 PCI Minimum Grant Desired Setting 474 * 5 15-8 PCI Maximum Latency Desired Setting 475 * 6 15-0 Subsystem Vendor ID 476 * 7 14-0 Subsystem ID 477 */ 478 479 #endif /* _DEV_IC_SMC83C170REG_H_ */ 480