Teknor Industrial Computers PCI-993, Technical Reference Manual, Page: 62 / 204

System 6-11
6.04 PCI/ISA SYSTEM CONTROLLER
The TEK933 board uses VIA’s VT82C570M Green PC Pentium/P54C PCI/ISA System
with plug and play and enhanced IDE controller. This chip set consists of the following
components:
•
The VT82C575M System Controller, located at U17 (#13) on Diagram 6-2,
•
The VT82C576M PCI Bus Controller located at U56 (#14) on Diagram 6-2,
•
The two VT82C577M Data Controllers located at U41 and U60 (#15) on Diagram
6-2, and
•
The VT82C416MV integrated real time clock and keyboard controller with PS/2
mouse support, located at U21 (#5) on Diagram 6-2.
As an integrated unit, the PCI/ISA System Controller offers the following features:
DRAM Controller
•
CPU/Cache to DRAM write buffer,
•
SIMM module support: 72-pin configuration,
•
Integrated DRAM controller:
- Supports CPU and PCI master accesses to System Memory,
- Supports 2MB to 128MB (256MB when available) of Cacheable System
Memory (DRAM).
Cache Controller
•
Direct mapped write back or write through secondary Cache,
•
Cache hit cycle of 3-2-2-2 on reads and 4-2-2-2 on writes using standard
asynchronous SRAMs at 60 and 66 MHz clock speed,
- Flexible Cache size up to 1MB,
•
Integrated 10-bit tag comparator,
•
Concurrent DRAM write-back.
ISA Bus Interface