4-14 Hardware Functional Overview
I/O Subsystem
The I/O (Input/Output) Subsystem of the notebook is implemented on the
motherboard using the SMC FDC37N769. It is a 3.3V PC97 compliant Super
I/O controller with Infrared support. The I/O chip provides the interface for the
serial port, printer port, IR port, and floppy disk drive.
The FDC37N769 utilizes SMC's proven SuperCell technology and is optimized
for motherboard applications. It incorporates SMC's true CMOS 765B floppy
disk controller, advanced digital separator, 16-byte data FIFO, and two 16C550
compatible UARTs. It also incorporates one Multi-Mode parallel port with
ChiProtect circuitry plus EPP and ECP support, game port chip select logic and
two floppy direct drive support.
Features Summary of the FDC37N769 chip:
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3.3Volt Operation
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Intelligent Auto Power Management
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16 Bit Address Qualification (optional)
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2.88 MB Super I/O Floppy Disk Controller
Licensed CMOS 765B Floppy Disk Controller
Supports Two Floppy Drives Directly
Supports Vertical Recording Format
16 Byte Data FIFO
100% IBM Compatibility
Sophisticated Power Control Circuitry (PCC) including Multiple
Power-Down Modes for Reduced Power Consumption
DMA Enable Logic
Data Rate and Drive Control Registers
Swap Drives A and B
Non-Burst Mode DMA option
Forceable Write Protect and Disk Change Controls
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Enhanced Digital Data Separator
2 Mbps, 1 Mbps, 500 Kbps, 300 Kbps, 250 Kbps Data Rates
Programmable Precompensation Modes
