FDC37M607 datasheet(142/182 Pages) SMSC

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142

Table 63 - KYBD, Logical Device 7 [Logical Device Number = 0x07]

NAME

REG INDEX

DEFINITION

STATE

KRST_GA20

Default = 0x00

on Vcc POR or

Reset_Drv

0xF0

R/W

KRESET and GateA20 Select

Bit[7] Polarity Select for P12

= 0 P12 active low (default)

= 1 P12 active high

Bits[6:3] Reserved

Bit[2] Port 92 Select

= 0 Port 92 Disabled

= 1 Port 92 Enabled

Bit[1] Reserved

Bit[0] Reserved

0xF1 -

0xFF

Reserved - read as ‘0’

Table 64 - Auxilliary I/O, Logical Device 8 [Logical Device Number = 0x08]

NAME

REG

INDEX

DEFINITION

STATE

Default = 0x00

on VTR POR

0xB8 R/W

Bits[7:0] Reserved

Pin Multiplex

Controls

Default = 0x06 on

Vcc POR

0xC0

Bit[0] IR Mode Select

Bit[1] DMA 3 Select

Bit[2] Reserved, read as “1”

Bit[3] 8042 Select

Bit[4] Reserved

Bit[5:7] Reserved

Force Disk Change

Default = 0x03 on

Vcc POR

0xC1

(R/W)

Bit[0] Force Change 0

Bit[1] Force Change 1

Bit[7:2] Reserved

Force Change[1:0] can be written to 1 but are not

clearable by software.

Force Change 1 is cleared on nSTEP and nDS1

Force Change 0 is cleared on nSTEP and nDS0

DSKCHG (FDC DIR Register, Bit 7) = (nDS0 AND

Force Change 0) OR (nDS1 AND Force Change 1)

OR nDSKCHG

C,R

FDC37M607 Datasheet(PDF) 142 Page - SMSC Corporation

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