Description:

Overview:

It consists of the following chips:

• 82356CS Memory to EISA Control (MECA)
• 82356DS Xpress Memory DRAM Control (RCA)
• 82353DS Data Path Parity Unit (DPP)
• 82351DS Common Local I/O Controller (CLASIC)

+82350DT EISA Chip Set in non-DT mode, that is:

• 82358DT EISA Bus Controller
• 82357 Integrated System Peripheral (ISP)
• 82352DT EISA Bus Buffers (EBB) (Optional 0-3)
  • 82352DT As Data Swap Buffer
  • 82352DT As Address Buffer
  • 82352DT As Data Parity Buffer

Features:

System Architecture:

• Six or Eight EISA bus master slots utilizing the Intel 82350DT chip set:

  • EISA Bus Controller (EBC: Intel 82358DT)
  • Integrated System Peripheral (ISP: Intel 82357)
  • EISA Bus Buffer (EBB: Intel 82352)

• Two Xpress CPU/Memory slots integrated with the Xpress chip set:

  • Xpress Memory to EISA Control (MECA: Intel 82356CS)
  • Xpress RAS/CAS DRAM Control (RCA: Intel 82356DS)
  • Xpress Data Path Parity (DPP: Intel 82353DS)
  • Common I/O Controller (CLASIC: Intel 82351DS)

System I/O Architecture:

• Two serial ports, one parallel port, PS/2 keyboard and mouse ports
• Dallas DS1287 Real Time Clock with an estimated lithium battery life of ten years
• Floppy interface with Intel 82077SL able to support up to four peripherals using 360 KB, 720 KB, 1.2 MB, 1.44 MB and 2.88 MB double/high density media
• 8/16 bit CAM 2 (or faster) IDE standard 40-pin interface
• Western Digital WD90C31 graphics controller with Super VGA support
• Sierra HiColor RAMDAC capable of displaying 32,000 colors in popular applications
• Adaptec 7770 32-bit SCSI-2 controller with two independent Fast/Narrow SCSI channels

Performance Enhancements:

• IDE interface supports DMA (DMA#3) transfers up to 8 MB/second when a 16-bit DMA transfer compatible hard drive is integrated in the system. This could potentially double the IDE disk I/O subsystem performance.
• Concurrent refresh reduces the system memory refresh overhead by allowing simultaneous CPU/cache cycles and EISA refresh cycles. This can increase overall system performance by as much as 7% in a full-featured Xpress system.
• 512 KB of Video DRAM is integrated on the baseboard. Four DIP sockets are available to install additional video DRAM up to 1MB. The video resolutions, color palette increase, and video performance is slightly faster.
• All CPU write cycles to an EISA agent are posted to allow a new CPU cycle to occur before the previous write cycle is actually completed. This can increase overall system performance by 2% to 5% depending on the application and use of the EISA agents by the Xpress CPU-to-I/O subsystem.
• Shadowing of add-in card BIOS code to fast 32-bit Xpress memory can increase performance of the add-in card by as much as 40%.
• The EISA bus specification for add-in board I/O command recovery time is different from the ISA bus. The Xpress baseboard contains the logic for meeting the EISA I/O recovery time while also fine-tuning this I/O cycle with the EISA bus snooping algorithm within the system BIOS.

Documented parts

• Intel 82351DS (CLASIC)
• Intel 82352 (EBB)
• Intel 82353DS (DPP)
• Intel 82356CS (MECA)
• Intel 82356DS (RCA)