Section 3 Functional Description; Figure 10: Block Diagram - Performance Computer PT-VME151A User Manual

Section
3
FUNCTIONAL DESCRIPTION
A block diagram of the PT-VME151A/151AE is provided below. Down the center are the 32-bit micro-
processor address and data busses. To the right is an 8-bit buffered data bus that provides I/O interface
connectivity. To the left is the VMEbus interface, provided by the Advanced VMEbus Interface Chip Set.
32-bit Microprocessor Address Bus
MC68040
or
MC68EC040
4,8,16,32 or 64
MB Dual Ported
DRAM
VMEbus
Control
ACC
AVICS64
Address
DARF64
Data
EPAK
Interface
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Figure 10: Block Diagram

32-bit Microprocessor Data Bus
8-bit
Buffer
16-bit
Buffer
82C54
Interval
Timer
Extensible Single Board Computer/Controller User's Manual 27
8-bit Buffered Data Bus
Timekeeping
RAM
PROM/SRAM
Sockets
Serial
EEPROM
2 RS-232
SIO Ports
DUART
68681
(Front Panel)
Single-Ended
SCSI 2
FAS216
(P2)
User LEDs &
System
Control bits
Control
Register
System Hex Switch
Status
Register