VL82C107

The VL82C107 has the following features including 146818A-compatible real-time clock 128 additional bytes of battery-backed CMOS RAM;AT-compatible keyboard controller with integrated PS/2. mouse support;SCAMP-compatible processor to ISA bus address registers/latches and buffers;DMA acknowledge decoder;PC memory card interface;8- or 16-bit PC memory card support;Optional support for IDE, floppy, and VL16C452 chip selects;XIP (Execute-In-Place) provisions;Integrated oscillator for 14.3181 MHz clock;1.5-micron CMOS in a 128-lead MQFP.

The VL82C107 SCAMP Combination I/O chip, when used with other VLSI SCAMP chips, allows designers to implement a very cost-effective minimum chip count motherboard. This chip combines a keyboard controller, a real-time clock with the address registers/latches and buffers, and DMA acknowledge decoders which are normally required in SCAMP-based systems. Additionally, the VL82C107 contains the circuitry necessary to interface PC memory cards to the system or provide the chip select and control signals for an external VL16C552 UART I/O device, FDC and IDE interface.The VL82C107 SCAMP Combination I/O chip combines a keyboard controller and a real-time clock with the address register/latches, buffers and DMA acknowledge decoders which are normally required in SCAMP-based systems. The VL82C107 additionally contains the circuitry necessary to interface PC memory cards to the system or to provide the chip select and control signals for an external VL16C452 UART I/O device, FDC, and IDE interface. While the VL82C107 has been optimized for use with the VL82C310/VL82C311 SCAMP Controllers, its uses are not restricted to this device combination.

The VL82C107 keyboard controller's microcontroller unit (MCU) offers a subset of the instruction set of the 8042 with 8042-like instructions. Enhancements VL82C107 have been made to conditional jumps (jumps may be made between pages). The on}hip ROM is loaded with the code that is required to support both PC/AT and PS/2 command sets, and the 128 bytes of conversion code.A small amount of scratch-pad RAM is provided as an extension of the MCU register set for the purpose of keyboard to host interfacing.