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CHAPTER 4 Functional Description
Introduction................................................................................................................4-1
Summary of Features.................................................................................................4-1
Processor and Memory .......................................................................................4-2
I/O Implementation.............................................................................................4-3
ASICs..................................................................................................................4-4
Block Diagram...........................................................................................................4-4
Functional Description...............................................................................................4-4
Data Bus Structure..............................................................................................4-6
Microprocessor ...................................................................................................4-6
MC68xx040 Cache......................................................................................4-6
No-VMEbus-Interface Option............................................................................4-7
Memory Options.................................................................................................4-7
DRAM .........................................................................................................4-7
SRAM..........................................................................................................4-8
About the Battery.........................................................................................4-9
EPROM and Flash Memory......................................................................4-11
Battery-Backed-Up RAM and Clock................................................................4-11
VMEbus Interface and VMEchip2 ...................................................................4-12
I/O Interfaces ....................................................................................................4-12
Serial Communications Interface ..............................................................4-12
IndustryPack (IP) Interfaces......................................................................4-15
Ethernet Interface ......................................................................................4-16
SCSI Interface............................................................................................4-17
SCSI Termination......................................................................................4-17
Local Resources................................................................................................4-17
Programmable Tick Timers.......................................................................4-17
Watchdog Timer........................................................................................4-18
Software-Programmable Hardware Interrupts...........................................4-18
Local Bus Timeout ....................................................................................4-18
Local Bus Arbiter..............................................................................................4-19
Connectors........................................................................................................4-19
Remote Status and Control........................................................................4-20
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