FDC37M607 datasheet(131/182 Pages) SMSC

131 / 182 page

131

Logical

Device

Configuration/Control

Registers [0x30-0xFF]

Used to access the registers that are assigned

to each logical unit. This chip supports nine

logical units and has nine sets of logical device

registers.

The six logical devices are Floppy,

Parallel, Serial 1, Serial 2, Keyboard Controller,

and Auxiliary_I/O.

A separate set (bank) of

control and configuration registers

exists for

each logical device and is selected with the

Logical Device # Register (0x07).

The INDEX PORT is used to select a specific

logical device register. These registers are then

accessed through the DATA PORT.

The Logical Device registers are accessible only

when the device is in the Configuration State.

The logical register addresses are shown in the

table below.

Table 55 - Logical Device Registers

LOGICAL DEVICE

ADDRESS

DESCRIPTION

STATE

Activate

Note1

Default = 0x00

on Vcc POR or

Reset_Drv

(0x30)

Bits[7:1] Reserved, set to zero.

Bit[0]

= 1Activates the logical device currently

selected through the Logical Device #

= 0 Logical

device

currently

selected

inactive

Logical Device Control

(0x31-0x37)

Reserved - Writes are ignored, reads return

Logical Device Control

(0x38-0x3f)

Vendor Defined - Reserved - Writes are

ignored, reads return 0.

Memory Base Address

(0x40-0x5F)

Reserved - Writes are ignored, reads return

I/O Base Address

(see Device Base I/O

Address Table)

Default = 0x00

on Vcc POR or

Reset_Drv

(0x60-0x6F)

0x60,2,... =

addr[15:8]

0x61,3,... =

addr[7:0]

Registers 0x60 and 0x61 set the base

address for the device.

If more than one

base address is required, the second base

address is set by registers 0x62 and 0x63.

Refer to Table 64 for the number of base

address registers used by each device.

Unused registers will ignore writes and return

zero when read.

FDC37M607 Datasheet(PDF) 131 Page - SMSC Corporation

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