FDC37C78_07 datasheet(10/82 Pages) SMSC

Part #	FDC37C78

Description	Floppy Disk Controller

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Manufacturer	SMSC [SMSC Corporation]

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FUNCTIONAL DESCRIPTION

FDC37C78 REGISTERS

The address map, shown below in Table 1, shows

the addresses of the different blocks of the

FDC37C78 immediately after power up. Some

addresses are used to access more than one

register.

HOST PROCESSOR INTERFACE

The

host

processor

communicates

with

the

FDC37C78

through

a

series

of

read/write

registers. The port addresses for these registers

are shown in Table 1.

Register access is

accomplished through programmed I/O or DMA

transfers. All registers are 8 bits wide.

Table 1 - FDC37C78 Block Addresses

ADDRESS

BLOCK NAME

NOTES

+0, +1

Configuration

Write only; Note 1, 2

Base +0,1

Floppy Disk

Read only; Disabled at power

up; Note 2

Base +[2:5, 7]

Floppy Disk

Disabled at power up; Note 2

Note 1: Configuration registers can only be modified in configuration mode, refer to the configuration

register description for more information. Access to status registers A and B of the floppy disk is

disabled in configuration mode.

Note 2: The fdc must be enabled in the configuration registers before accessing the registers.

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