Description:

82359 DRAM Controller

Note: This is only used in DT mode.

The 82359 DRAM Controller is a highly integrated advanced memory controller capable oi supporting today's Intel386 and Intel486 high performance microprocessors. Its decoupled handshake protocol gives the 82359 independence over processor type and speed, allowing the system designer to implement a variety of CPU/ cache combinations.

The 82359 implements a dual ported architecture by providing two independent address paths to main memory. This allows activity on each bus to run independently of the other, giving each greater bus throughput and decreased bus latency.

The 82359 provides address control, refresh generation. critical DRAM timing generation and by working closely with two 82353 Advanced Data Path devices, provides a highly integrated 32-bit dual ported memory controller in just three VLSI components.

Features:

• Dual Ported Memory Controller
  • Allows EISA/Host Bus Concurrency
  • CPU Speed Independent
  • Controls up to 256M of Motherboard DRAM
  • LIM Hardware Support
  • Support for Shadow/Disable/Remap/Cacheing/Write Protect of Motherboard Memory
• Flexible DRAM Support
  • 64K, 256K, 1M, 4M, 16M (4M X 4) DRAMs
  • 60 ns, 70 ns, 80 ns speeds
  • Single or Double Density SIMMs
  • Ability to Mix DRAM Sizes
  • Supports 32-, 64-, or 128-Bit Wide Memory Configurations
• High Integration
  • Integrated Posted Write Latch
  • Cacheability/Write Protect Map
  • Integrated Delay Lines
  • Integrated Bus Drivers
• Integrated Delay Line
  • Critical DRAM Timings Generated Internally
  • DRAM Timings are Programmable with 2.61 ns Resolution
• Cache Support
  • Support for 82385, 82395, 82485 Cache
  • Built-in Snoop Filter
• CPU Support
  • Support for Intel386 and Intel486 Microprocessors
  • Intel486 Burst Reads at 0 Wait State
  • Posted Writes at 0 Wait State
• 196-Pin PQFP Package