FDC37B78X 데이터 시트보기 (PDF) - SMSC -> Microchip

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FDC37B78X

Enhanced Super I/O Controller with ACPI Support, Real Time Clock and Consumer IR

SMSC -> Microchip 

EXTENDED CAPABILITIES PARALLEL PORT

ECP provides a number of advantages, some of

which are listed below. The individual features

are explained in greater detail in the remainder

of this section.

• High performance half-duplex forward and

reverse channel

• Interlocked handshake, for fast reliable

transfer

• Optional single byte RLE compression for

improved throughput (64:1)

• Channel addressing for low-cost peripherals

• Maintains link and data layer separation

• Permits the use of active output drivers

• Permits the use of adaptive signal timing

• Peer-to-peer capability

Vocabulary

The following terms are used in this document:

assert: When a signal asserts it transitions to a

"true" state, when a signal deasserts it

transitions to a "false" state.

forward: Host to Peripheral communication.

reverse: Peripheral to Host communication

Pword: A port word; equal in size to the width

of the ISA interface. For this

implementation, PWord is always 8

bits.

1

A high level.

0

A low level.

These terms may be considered synonymous:

• PeriphClk, nAck

• HostAck, nAutoFd

• PeriphAck, Busy

• nPeriphRequest, nFault

• nReverseRequest, nInit

• nAckReverse, PError

• Xflag, Select

• ECPMode, nSelectln

• HostClk, nStrobe

Reference Document: IEEE 1284 Extended

Capabilities Port Protocol and ISA Interface

Standard, Rev 1.14, July 14, 1993. This

document is available from Microsoft.

96

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