Description:

82C283 386SX System Controller

The 82C283 is a highly integrated, AT system logic VLSI chip for high-end 386SX/AT systems. It integrates a local memory controller (local memory is on-board memory), AT bus controller, and data bus controller into one chip. It is designed for systems running at 16MHz, 20MHz, 25MHz, and 33MHz*. A high performance, compact 386SX/AT system is readily implemented with the 82C283 and a standard peripheral controller like OPTi's 82C206 or the 82C100 (with Dallas Semi-conductor (DS1287).

*Rev B Only

Versions:

• 82C283A 16-25MHz
• 82C283B 16-33MHz

Features:

• Flexible DRAM banks configuration
  • Supports 256K, 1M and 4M DRAM modules (16MB total)
• Block interleave mode operations
  • Block interleaving at a block size of 512 bytes
• BIOS shadow RAM
  • Shadow RAM for system, video and adapter BIOS
• Memory remapping
• Flexible multiplexed DRAM address
• Programmable AT bus clock
• Turbo switch
• 160-pin PQFP (Plastic Quad Flat Pack)