Eprom And Flash Memory; Battery Backed Up Ram And Clock; Vmebus Interface And Vmechip2 - Motorola 700 Series Installation And Use Manual

Board Level Hardware Description
1

EPROM and Flash Memory

Battery Backed Up RAM and Clock

VMEbus Interface and VMEchip2

1-20
The MVME162LX may be ordered with 2MB of Flash memory and
two EPROM sockets ready for the installation of the EPROMs,
which may be ordered separately. Flash memory is a single Intel
28F016SA device organized in a 2Mbit x 8 configuration. The
EPROM locations are standard JEDEC 32-pin DIP sockets that
accommodate three jumper-selectable densities (256 Kbit x 8;
512 Kbit x 8, the factory default; 1 Mbit x8). A jumper setting (GPI3,
pins 7-8 on J21), allows reset code to be fetched either from Flash
memory (GPI3 installed) or from EPROMs (GPI3 removed).
An M48T58 RAM and clock chip is used on the MVME162LX. This
chip provides a time-of-day clock, oscillator, crystal, power fail
detection, memory write protection, 8KB of RAM, and a battery in
one 28-pin package. The clock provides seconds, minutes, hours,
day, date, month, and year in BCD 24-hour format. Corrections for
28-, 29- (leap year), and 30-day months are automatically made. No
interrupts are generated by the clock. Although the M48T58 is an 8
bit device, the interface provided by the MC2chip supports
8-, 16-, and 32-bit accesses to the M48T58. Refer to the MC2chip in
the MVME162LX Embedded Controller Programmer's Reference Guide
and to the M48T58 data sheet for detailed programming and battery
life information.
The optional VMEchip2 provides the local-bus-to-VMEbus
interface, the VMEbus-to-local-bus interface, and the DMA
controller functions of the local VMEbus. The VMEchip2 also
provides the VMEbus system controller functions. Refer to the
VMEchip2 description in the MVME162LX Embedded Controller
Programmer's Reference Guide for detailed programming
information.