FDC87W21 View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

View to exact match

FDC87W21

Power I/O Controller with Fast Infrared Support

SMSC -> Microchip 

Tape Drive

The FDC87W21 supports standard tape drives

(1 Mbps, 500 Kbps, 250 Kbps) and new fast

tape drive (2 Mbps). When working at 2 Mbps,

you need to change the crystal to 48 MHz.

FDC Core

The FDC87W21 FDC is capable of performing

twenty commands. Each command is initiated

by a multi-byte transfer from the

microprocessor. The result can also be a multi-

byte transfer back to the microprocessor. Each

command consists of three phases: command,

execution, and result.

Command

The microprocessor issues all required

information to the controller to perform a

specific operation.

Execution

The controller performs the specified operation.

Result

After the operation is completed, status

information and other housekeeping information

is provided to the microprocessor.

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