VLSI VL82CPCAT-QC (Popular AT 12 MHz 0/1 ws)
Chipset parts: VLSI VL82C101 (PC/AT-Compatible System Controller) VLSI VL82C102 (PC/AT-Compatible Memory Controller) VLSI VL82C103 (PC/AT-Compatible Address Buffer) VLSI VL82C104 (PC/AT-Compatible Data Buffer) VLSI VL82C100 (PC/AT-Compatible Peripheral Controller)

Overview

mR_Slug Notes: There was a 16MHz version the VL82CPCPM though this is likely vapourware.

The IBM PC/AT compatible chip set from VLSI Technology, Inc. supports 1-Megabit dynamic RAMs, and is utilized in systems with clock speeds up to 12 MHz. The chip set provides the IBM PC/AT compatible system with a completely compatible low-cost board design solution. Further, since the devices were designed using VLSIs design tools, the devices can be quickly modified for use as cores in user-specific designs. The five device chip set has been designed using the highest integration consistent with economic and reliable system design. The VL82C103 Address Buffer and VL82C104 Data Buffer are offered in separate packages, although their circuit is relatively small. If they were offered as a single device, the pin count would be extremely high, or some performance degradation would occur.

  • 100% PC/AT-Compatible
  • 1 ws/120ns DRAM. 0 ws/80ns DRAM
  • 8 MHz Backplane with External Clock Modulation PAL
  • Max 4MB RAM
  • VL82C100 Peripheral Controller supports up to 16 MHz (or 20 MHz with -20QC). All other chips support up to 12 MHz system clock.
  • Replaces up to 75 components on the PC/AT-type board. As well as several buffers, latches and other logic devices
    • VL82C100, 19 logic devices
    • VL82C101A, 10 integrated circuits (B version 36)
    • VL82C102A, 20 integrated circuits
    • VL82C103A, several buffers, latches and other logic devices
    • VL82C104, several buffers, latches and other logic devices
  • VL82C103A Completely performs address buffer function in IBM PC/AT-compatible systems
  • VL82C104 Completely performs data buffer function in IBM PC/AT-compatible systems
  • Seven DMA channels
  • 14 external interrupt requests
  • Three timer/counter channels
  • Sink 20 mA on slot driver outputs
  • VL82C102A Completely performs memory control function in IBM PC/AT-compatible systems
  • Devices are available as "cores" for user-specific designs
  • Designed in CMOS for low power consumption

Documented parts


VL82C101 PC/AT-Compatible System Controller

The VL82C101A PC/AT-Compatible System Controller replaces two 82C284 Clock Controller and 82C288 Bus Controller (both are used in '286-based systems), an 82C84A Clock Generator and Driver, two PAL16L8 devices (used for memory decode), and approximately ten (31 in the B variant) other less complex integrated circuits used as Wait State logic. When used in 12 MHz systems utilizing 80 ns DRAMs, the device provides the required one wait state for a "write" operation, and zero wait states for a "read" operation. A 12 MHz system using 120 ns DRAMs will be provided with one wait state for "write" and one wait state for "read". The device accepts both the 24 MHz crystal to control the system clock as well as the 14.318 MHz crystal to control the video clock. It also supplies reset and clock signals to the I/O slots.

The device is manufactured with VLSI's advanced high-performance CMOS process and is available in JEDEC-standard 84-pin plastic leaded chip carrier (PLCC) package. The VL82C101B is part of the PC/AT-compatible chips sets available from VLSI.

  • Fully compatible with IBM PC/AT-type designs
  • Replaces 36 integrated circuits on the PC/AT-type board
  • Supports up to 12 MHz system clock
  • Device is available as "cores" for user-specific designs
  • Sink 20 mA on slot driver outputs
  • Designed in CMOS for low power consumption

VL82C102 PC/AT-Compatible Memory Controller

The VL82C102 PC/AT-Compatible Memory Controller generates the row address strobe (RAS) and column address strobe (CAS) necessary to support the dynamic RAMs used in PC/AT-type systems. In addition, the device allows five motherboard memory options for the user, up to a full 4M-byte system. Four of the five options allow a full 640K-bytes user area to support the disk operating system (DOS). In addition, the VL82C102 provides the upper addresses to the I/O slots, the chip select for the ROM and RAM memory, and drives the system speaker.

The device is manufactured with VLSI's advanced high-performance CMOS process and is available in JEDEC-standard 84-pin plastic leaded chip carrier (PLCC) package. The VL82C102 is part of the PC/AT-compatible chips sets available from VLSI.

  • Fully compatible with IBM PC/AT-type designs
  • Completely performs memory control function in IBM PC/AT-compatible systems
  • Replaces 20 integrated circuits on PC/AT-type motherboard
  • Supports up to 12 MHz system clock
  • Device is available as "cores" for user-specific designs
  • Designed in CMOS for low power consumption

Two versions, VL82C102A and VL82C102B, see datasheets for details.


VL82C103 PC/AT-Compatible Address Buffer

Note: The VL82C103A is a somehow updated version released in '89.

The VL82C103A PC/AT-Compatible Address Buffer provides the system with a 16- bit address bus input from the CPU to 41 buffered drivers. The buffered drivers consist of 17 bidirectional system bus drivers, each capable of sinking 20 mA (50 'LS loads) of current and driving 200 pF of capacitance on the backplane; 16 bidirectional peripheral bus drivers, each capable of sinking 8 mA (20 'LS loads) of current; and eight memory bus drivers, also capable of sinking 8 mA of current. On-chip refresh circuitry supports both 256K-bit and 1M-bit DRAMS. The VL82C103A provides addressing for the I/O slots as well as the system.

The device is manufactured with VLSI's advanced high-performance CMOS process and is available in JEDEC-standard 84-pin plastic leaded chip carrier (PLCC) package. The VL82C103A is part of the PC/AT-compatible chips sets available from VLSI.

  • Fully compatible with IBM PC/AT-type designs
  • Completely performs address buffer function in IBM PC/AT-compatible systems
  • Replaces several buffers, latches and other logic devices
  • Supports up to 12 MHz system clock
  • Device is available as "cores" for user-specific designs
  • Designed in CMOS for low power consumption

VL82C104 PC/AT-Compatible Data Buffer

The VL82C104 PC/AT-Compatible Data Buffer provides a 16-bit CPU data bus I/O as well as 40 buffered drivers. The buffered drivers consist of 16 bi- directional system data bus drivers, each capable of sinking 20 mA (50 'LS loads) of current; eight bidirectional peripheral bus drivers, each capable of sinking 8 mA (20 'LS loads) of current; and 16 memory data bus drivers, each capable of sinking 8 mA (20 'LS loads) of current. The VL82C104 also generates the parity error signal for the system.

The device is manufactured with VLSI's advanced high-performance CMOS process and is available in JEDEC-standard 84-pin plastic leaded chip carrier (PLCC) package. The VL82C104 is part of the PC/AT-compatible chips sets available from VLSI.

  • Fully compatible with IBM PC/AT-type designs
  • Completely performs data buffer function in IBM PC/AT-compatible systems
  • Replaces several buffers, latches and other logic devices
  • Supports up to 12 MHz system clock
  • Device is available as "cores" for user-specific designs
  • Designed in CMOS for low power consumption

VL82C100 PC/AT-Compatible Peripheral Controller

The VL82C100 PC/AT-Compatible Peripheral Controller replaces two 82C37A Direct Memory Access Controllers, two 82C59A Interrupt Controllers, an 82C54 Program- mable Counter, a 74LS612 AT Memory Mapper, two 74ALS573 Octal Three-State Latches, a 74ALS138 3-to-8 Decoder, and five other less-complex integrated circuits. Using this internal functionality, the VL82C100 provides all 24 address bits for 16M bits of DMA address space. It also interfaces directly to the CPU to handle all interrupts. Timing for refresh cycles and arbitration, between refresh and DMA hold requests, are also controlled by the VL82C100.

The device is manufactured with VLSI's advanced high-performance CMOS process and is available in JEDEC-standard 84-pin plastic leaded chip carrier (PLCC) package. The VL82C100 is part of the PC/AT-compatible chips sets available from VLSI.

  • Fully compatible with IBM PC/AT-type designs
  • Replaces 19 logic devices
  • Supports 12MHz system clock
  • Device is available as "cores" for user-specific designs
  • Seven DMA channels
  • 14 external interrupt requests
  • Three timer/counter channels
  • Designed in CMOS for low power consumption

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