Lisa Hardware Reference Manual Jul81

LISA Hardware REFERENCE MANUAL Bill Schottstaedt Ext. 2379 Conf i,den tial Lisa Hardware Reference Manual TABLE OF CONTENTS OVERVIEW 4 5 5 6 The Processor Video Display Memory The System Bus THE CPU BOARD 7 7 9 9 10 12 12 13 14 15 16 17 18 18 20 21 23 24 25 The 68000 Interrupts Memory Memory Configurations The Memory Management Unit The Segment Origin Context Selection The Segment Limit The Process Stack Loading·the MMU Registers Memory Errors The Status Register The Memory Error Address Latch Memory Diagnostic Mode Video Circuit Contrast Control System Bus Timing Memory Bus Timing Summary of MMU Locations THE 10 BOARD 26 26 28 31 32 32 34 34 35 36 37 38 39 40 42 42 44 44 45 The Input/Output Board The Keyboard Interface COPS Command Timing Reset Codes The Keyboard Keycodes The Mouse Mouse Commands Mouse Data The Clock/Calendar Circuit Setting the Clock The CVSD and the Speaker The Serial Interface Baud Rate Generation The Floppy Disk Controller Disk Controller Commands Disk Data Storage Interrupts Non-volatile Memory 7-Jul-81 Confidential 45 Lisa Hardware Reference Manual The Battery The Hard Disk Interface I/O Space Addresses 46 51 THE EXPANSION I/O SLOTS 53 53 57 58 The Expansion I/O Slots Signal Description Device Protocol Direct Memory Access GLOSSARY SCHEMATICS ,7-Jul-81 Lisa Hardware Reference Manual Confidential 7-Jul-81 HARDWARE OVERVIEW The Lisa hardware can be divided into four functional pieces: the CPU and memory management unit, the I/O circuitry, the memory arrays, and the expansion slots. The main microprocessor is a Motorola MC68000. It communicates with the rest of the Lisa world over two buses: the system bus, and the memory bus. The I/O circuitry includes the built-in parallel interface, two serial interfaces, floppy disk controller, clock-calendar, speaker, and keyboard interface. SYSTEM BLOCK DIAGR&~ ------- ---+ Expansion Slot a I +--_._-,-----+ +---------- +-----------+ -I I Memory Array 1 I I Expansion Slot 1 I +--------+ +------------+ +------ +-----------i- I -=+ I Expansion Slot 2 Memory Array 2 I -- ... _------+ System Bus --------------.._--_.._--------------+ .--+ -+--I/O BOARD: Floppy Disk Controller Hard Disk Interface Keyboard Interface Speaker and CVSD Serial I/O Ports Clock/Calendar/Alarm +------ I I I I I I I I +--------- ---_._---- . - + I I I I' I I I ----+ Memory Bus CPU BOARD: 1 I ( 68000 and Buffers Memory Management Unit I Boot and diagnostics ROM I Video Circuitry I Memory Access Control I I , I +-------------...=-----+ THE PROCESSOR The Motorola MC68000 Microprocessor User's Manual fully describes the operation of the processor, including its instruction set and timing. The Lisa 68000 has a 5 megahertz clock. The memory cycle time is 800 nanoseconds; therefore instructions that use a multiple of four clock cycles can execute without a wait state. Page 4 Lisa Hardware Reference Manual Confidential 7-Jul-81 VIDEO DISPLAY The bit mapped d…