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r/iO- HEWLETT
a!~ PACKARD
CONTENTS
1. General. . 4
1.1 Features 4
1.2 Pin List 5
1.3 Pin Description . . 9
1.4 Electrical Specifications 15
2. LAN Support . . . 17
3. NEW I/O Capabilities . 18
3.1 Overview . . . . 18
3.2 Primary ID /Reset Register . . . . 19
3.3 Status/First ARM Control Register 19
3.4 Extended ID /Second Arm Control Register 20
3.5 Bus Error Timeout Control Register 21
3.6 Scratch Register. . . . . . . . . 22
3.7 PTM/Expanded BOOT ROM Control Register . 22
3.8 Timing. . . . . . 23
4. PROGRAMMABLE TIMER 28
4.1 Features . . . . . 28
4.2 Power Up Initialization 28
4.3 Memory Map 29
4.4 Control . . . . . 30
4.5 Timing. . . . . . 31
5. BOOT ROM and TEST LED Support 34
5.1 BOOT ROM and TEST LED Signals 34
5.2 Timing. . . . . 34
6. Keyboard System Support 37
6.1 Keyboard Signals 37
6.2 Timing. . . 38
7. Buffer Control. . . 41
7.1 Control Signals 41
8. TEST MODES 43
8.1 Introduction 43
8.2 Initialization . 43
8.3 Scan Path . 43
8.4 PC Board Test Support 45
DESCRIPTION: BURNNI External Reference Specification I Dwg no. A-1LY4-0302-1 IPAGE 2 of 46
rli~ HEWLETT
a:~ PACKARD
BURNNI
BASIC STANDARD I/O
External Reference Specification
Martirt Speer
Bruce Bergmann
Hewlett-Packard Co.
Fort Collins System Division
February 28, 1990
DESCRIPTION: BURNNI External Reference Specification I Dwg no. A-ILY4-0302-1 I PAGE 3 of 46
Flin- HEWLETT
~~ PACKARD
1. General
BURNNI is one of two core I/O ASICs developed to save PC board area and cost by integrating most of the
"glue logic" surrounding the Series 300 core I/O plus some of the core I/O itself. In addition to this, some
new I/O was added to improve system adaptability and improve the ability for a user to configure the system.
The enhancement which was added to improve the adaptability of the system was a programmable BUS
Error timer. EEPROM support was added in order to eliminate configuration switches and for the storage
of the LAN Lanic Address. This allows users to easily change the configuration of their system through the
use of configuration software(BOOT ROM resident) and not by opening up the system and trying to figure
out switch settings(although this will still be necessary for some optional I/O cards).
1.1 Features
This is the fill list of functions performed by BURNNI: