82C862 datasheet(44/51 Pages) ETC2

44 / 51 page

FireLink USB

82C862

912-2000-030

Revision: 1.0

Page 40

Reserved

MEMOFST 104h

HceInput Register - Bytes 0

Default = 00h

Input Data:

- I/O data that is written to Ports 60h and 64h is captured in this register.

Note: Refer to Table 4-4, "Emulated Registers and Side Effects", if emulation is enabled.

MEMOFST 105h-107h

HceInput Register - Bytes 1-3

Default = 00h

Reserved

MEMOFST 108h

HceOutput Register - Bytes 0

Default = 00h

Output Data:

- This register hosts data that is returned when an I/O read of Port 60h is performed by application software.

Note: Refer to Table 4-4, "Emulated Registers and Side Effects", if emulation is enabled.)

MEMOFST 109h-10Bh

HceOutput Register - Bytes 1-3

Default = 00h

Reserved

MEMOFST 10Ch

HceStatus Register - Byte 0

Default = 00h

Parity

Indicates parity

error on

keyboard/mous

e data.

Time-out

Used to indicate

a time-out

Aux Output

Full

Assert IRQ12 if

Output Full bit

(MEMOFST

10Ch[0]) = 1

and IRQEn bit

(MEMOFST

100h[3]) = 1?

0 = No

1 = Yes

Inhibit Switch

Reflects state of

the keyboard

inhibit switch:

0 = Inhibited

1 = Not

inhibited

Cmd Data

HC sets this bit

on I/O writes to

Ports 60h and

64h:

0 = Port 60h

1 = Port 64h

Flag

Nominally used

as a system

flag by software

to indicate a

warm or cold

boot.

Input Full

HC sets this bit

to 1 on an I/O

write to Port

60h or 64h

except for the

case of a

GateA20

Sequence.

While set to 1

and emulation

is enabled

(MEMOFST

100h[0] = 1), an

emulation

interrupt

condition exists.

Output Full

HC sets this bit

to 0 on a read

of Port 60h.

While this bit is

0 and the

Character

Pending bit

(MEMOFST

100h[2]) = 1, an

emulation

interrupt

condition exists.

Setting this bit

to 1 will

generate either

IRQ1 or IRQ12

under certain

conditions(1).

(1) If the IRQEn bit (MEMOFST 100h[3]) = 1 and Aux Output Full bit (MEMOFST 10Ch[5]) = 0: IRQ1 is generated.

If the IRQEn bit (MEMOFST 100h[3]) = 1 and Aux Output Full bit (MEMOFST 10Ch[5]) = 1: IRQ12 is generated.

Note: Refer to Table 4-4, "Emulated Registers and Side Effects", on page 18 if emulation is enabled.

MEMOFST 10Dh-10Fh

HceStatus Register - Bytes 1-3

Default = 00h

Reserved

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