Acer 390 Series, Service Manual

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Major Chips Description 2-49
2.3.2 General Description
The FDC37C67x with Consumer IR and IrDA v 1.1 support incorporates a keyboard interface,
SMC's true CMOS 765B floppy disk controller, advanced digital data separator, two 16C550
compatible UARTs, one Multi-Mode parallel port which includes ChiProtect circuitry plus EPP and
ECP, on-chip 24 mA AT bus drivers, two floppy direct drive support, Intelligent power management
and SMI support. The true CMOS 765B core provides 100% compatibility with IBM PC/XT and
PC/AT architectures in addition to providing data overflow and underflow protection. The SMC
advanced digital data separator incorporates SMC's patented data separator technology, allowing
for ease of testing and use. Both on-chip UARTs are compatible with the NS16C550. The parallel
port is compatible with IBM PC/AT architecture, as well as IEEE 1284 EPP and ECP. The
FDC37C67x incorporates sophisticated power control circuitry (PCC). The PCC supports multiple
low power down modes.
The FDC37C67x supports the ISA Plug-and-Play Standard (Version 1.0a) and provides the
recommended functionality to support Windows '95. The l/O Address, DMA Channel and Hardware
IRQ of each logical device in the FDC37C67x may be reprogrammed through the internal
configuration registers. There are 480 I/O address location options, 8 parallel IRQs, an optional
Serialized IRQ interface, and three DMA channels.
The FDC37C67x does not require any external filter components and is therefore easy to use and
offers lower system costs and reduced board area. The FDC37C67x is software and register
compatible with SMC's proprietary 82077AA core