Technical Reference Manual ~ BU~lOGIC S[SI HOST ADAPTERS fOR P[1. VfSA, fISA, AND ISA SYSTEMS Revision History Revision Change Activity Date A Release 6/1/94 Compliance Statements This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference re­ ceived, including interference that may cause undesired operations. Declaration of the Manufacturer/Importer We hereby certify that the SCSI Host Adapter for PCI, VESA, EISA and ISA, in compliance with the re­ quirements of BMPT Vfg 243/1991, is RFI suppressed. The normal operation of some equipment (e.g., . signal generators) may be subject to specific restrictions. Please observe the notices in the user's manual. The marketing and sale of the equipment was reported to the Federal Office for Telecommunication Per­ mits (BZT). The right to retest this equipment to verify compliance with the regulation was given to the ZZF. Bescheinungung des Herstellers/lmporteurs Hiermit wird bescheinigt, das SCSI Host Adapter for PCI, VESA, EISA and ISA in Uebereinstimmung mit den Bestimmungen der BMPT-AmtsbIVfg 243/1991 funk-entstort ist. Der vorschriftsmassige Be­ treib mancher Gerate (z. B. Messender) kann allerdings gewissen Einschrankungen unterliegen. Beacht­ en Sie deshalb die Hinweise in der Bedienungsanleitung. Dem Bundesamt fUr Zulassungen in der Telekommunikation wurde das Inverkehrbringen dieses Gerates angezeigt und die Berechtigung zur Ueberpriifung der Serie auf die Einhaltung der Bestimmu­ ngen eingeraumt. EN 55 022 Declaration of Conformance This is to certify that BusLogic SCSI Host Adapters are shielded against the generation of radio interfer­ ence in accordance with the application of Council Directive 89/336/EEC, Article 4a. Conformity is de­ clared by the application of EN 55 022:1987 Class B (CISPR 22:1985/BS 6527:1988). Copyright © Copyright 1994 BusLogic Inc. All rights reserved. BusLogic Inc makes no warranty of any kind with regard to this material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. BusLogic is not liable for any errors contained herein or incidental or consequential damages in connection with furnishing, per­ formance or use of this material. This document contains proprietary information which is protected by copyright. All rights are re­ served. No part of this document may be photocopied, reproduced or translated to another language without prior written consent of BusLogic Inc. Trademarks Company and product names are trademarks or registered trademarks of their respective companies. Table of Contents Preface Part 1 Adapter Operation Part 2 pcr Host Adapters Part 3 VESA Host Adapters Part 4 EISA Host Adapters Part 5 ISA Host Adapters Index Preface The BusLogic SCSI Host Adapter Technical Reference Manual is intended for sys­ tem software programmers desiring to develop deviee driver software for BusLog­ ie's family of SCSI adapter products. This manual covers adapter architecture, hardware and software operation and in­ cludes electrical signaling information for each bus architecture. Products covered in this document include: • BT-946C PCI Fast SCSI Host Adapter (10 MBytes/sec synchronous data transfer rate; no floppy connector) • BT-440/445C VESAFast SCSI Host Adapter (10 MBytes/sec synchronous data transfer rate; BT-44OC has no floppy connector) • BT-746/747C EISA Fast SCSI Host Adapter (10 MBytes/sec synchronous data transfer rate; BT-746C has no floppy connector) • BT-545C PC/AT Fast SCSI Host Adapter (10 MBytes/ sec synchronous data transfer rate) • BT-540CF PC/AT Fast SCSI Host Adapter (with Centronics external SCSI con­ nector) Contents This manual is organized in the following manner: Part 1: Adapter Operation • Section 1 contains an overview to BusLogie's MultiMaster™ technology. • Section 2 details adapter hardware components and operation. • Section 3 discusses software operation between the host adapter and the host system. • Section 4 describes the adapter's SCSI electrical interface. • Section 5 describes the adapter's floppy controller interface. • Section 6 details adapter internal diagnostics. • Appendix A is a list of industry acronyms. Part 2: PCI Host Adapters • Section 1 includes descriptions and specifications for the BT-946C host adapter. • Section 2 describes the electrical interface for the BT-946C host adapter. • Section 3 contains the PCI bus timing diagrams. • Section 4 details the configuration for non-conforming PCI motherboards. Preface _ v Part 3: VESA Host Adapters • Section 1 includes descriptions and specifications for the BT-440 /44SC host adapter. • Section 2 describes the electrical interface for the BT-440/ 44SC host adapter. • Section 3 contains the VL-Bus timing descriptions. Part 4: EISA Host Adapters • Section 1 includes descriptions and specifications for the BT-746/747C host adapter. • Section 2 describes the electrical interface for EISA host adapters. • Section 3 contains the EISA bus master timing diagrams. Part 5: ISA Host Adapters • Section 1 includes descriptions and specifications for the BT-S4OCF and the BT- 54SC host adapters. • Section 2 describes the electrical interface for ISA host adapters. • Section 3 contains the ISA bus master timing diagrams. Related Documentation Refer to the user's guide provided with your BusLogic host adapter for details on host adapter installation and configuration. Notational Conventions The following conventions are used throughout this manual: Convention Description UPPERCASE Used to indicate the names of keys. A hyphen indicates an active low signal. + A plus sign indicates an active high signal. SCSI Host Adapter Technical Reference Manual _ vi 1 OU~lOGIC PART 1 ADAPUR OPfRATION . Part 1 : Contents Section 1-1: BusLogic MultiMastering Technology Introduction ........................................................................................................ :... 1-1 Bus Mastering DMA .............................................................................................. 1-1 Description ...................................................................................................... 1-2 Configuration .................................................................................................. 1-2 Bus Master Transfers ...................................................................................... 1-3 MultiMaster Advantages ............................................................................... 1-4 Section 1-2: Hardware Description Adapter Architecture ............................................................................................ 1-7 Bus Master DMA Controller ......................................................................... 1-8 Advanced SCSI Controller ............................................................................ 1-8 Microprocessor Unit (MPU) .......................................................................... 1-9 Local BIOS ROM ............................................................................................. 1-9 Floppy Disk Controller ................................................................................... 1-9 Host DMA Data Transfer Control. ...................................................................... 1-9 ISA .................................................................................................................... 1-9 EISA .................................................................................................................. 1-9 VESA .............................................................................................................. 1-10 PCI .................................................................................................................. 1-10 Hardware Registers ............................................................................................. 1-10 Control Register (Write Only) I/O Base Address + 0 ............................. 1-11 Status Register (Read Only) I/O Base Address + 0 ................................. 1-12 Command/Parameter Register (Write Only) I/O Base Address + 1 ... 1-13 Data In Register (Read Only) I/O Base Address + 1.. ............................. 1-14 Interrupt Register (Read Only) I/O Base Address + 2 ........................... 1-15 Reset Operations .................................................................................................. 1-17 Host-Initiated Reset Operations ................................................................. 1-17 SCSI Bus Reset Operations .......................................................................... 1-18 Section 1-3: Software Interface Bus Master Direct Memory Access (DMA) ...................................................... 1-22 Interrupt Processing ............................................................................................ 1-22 Host Adapter Commands .................................................................................. 1-23 Addressing Mode ................................................................................................ 1-31 24-Bit Mode Mailbox Commands ..................................................................... 1-31 24-Bit Mode Mailbox Initialization .......... ;........................................................ 1-32 24-Bit Mode Outgoing Mailbox Structure........................................................ 1-33 24-Bit Mode Incoming Mailbox Structure