4

White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com

White Electronic Designs

WED7PxxxCFA70xxI25

July 2005

Rev. 1

White Electronic Designs Corp. reserves the right to change products or specifications without notice.

2. Task File register access specifications

There are two types of Task File register mapping, one is mapped I/O address area, the other is mapped Memory address

area. Each type of Task File register read and write operation is executed under the condition as follows. That area can

be accessed by Byte/Word/Odd Byte modes, which are defined by PC card standard specifications.

(1) I/O address map – Task File Register Read Access Mode (1)

Mode

REG#

CE2#

CE1#

A0

IORD#

IOWR#

OE#

WE#

D8 to D15

D0 to D7

Standby mode

X

H

H

XXXXX

High-Z

High-Z

Byte access (8bit)

L

H

L

L

L

H

H

H

High-Z

even byte

L

H

L

H

L

H

H

H

High-Z

odd byte

Word access (16bit)

L

L

L

X

L

H

H

H

odd byte

even byte

Odd byte access (8bit)

L

L

H

X

L

H

H

H

odd byte

High-Z

Note: X → L or H

Task File Register Write Access Mode (1)

Mode

REG#

CE2#

CE1#

A0

IORD#

IOWR#

OE#

WE#

D8 to D15

D0 to D7

Standby mode

X

H

H

XXXXX

Don’t care

Don’t care

Byte access (8bit)

L

H

L

L

H

L

H

H

Don’t care

even byte

L

H

L

H

H

L

H

H

Don’t care

odd byte

Word access (16bit)

L

L

L

X

H

L

H

H

odd byte

even byte

Odd byte access (8bit)

L

L

H

X

H

L

H

H

odd byte

Don’t care

Note: X → L or H

(2) Memory address map – Task File Register Read Access Mode (2)

Mode

REG#

CE2#

CE1#

A0

OE#

WE#

IORD#

IOWR#

D8 to D15

D0 to D7

Standby mode

X

H

H

XXXXX

High-Z

High-Z

Byte access (8bit)

H

H

L

L

L

H

H

H

High-Z

even byte

H

H

L

H

L

H

H

H

High-Z

odd byte

Word access (16bit)

H

L

L

X

L

H

H

H

odd byte

even byte

Odd byte access (8bit)

H

L

H

X

L

H

H

H

odd byte

High-Z

Note: X → L or H

Task File Register Write Access Mode (2)

Mode

REG#

CE2#

CE1#

A0

OE#

WE#

IORD#

IOWR#

D8 to D15

D0 to D7

Standby mode

X

H

H

XXXXX

Don’t care

Don’t care

Byte access (8bit)

H

H

L

L

H

L

H

H

Don’t care

even byte

H

H

L

H

H

L

H

H

Don’t care

odd byte

Word access (16bit)

H

L

L

X

H

L

H

H

odd byte

even byte

Odd byte access (8bit)

H

L

H

X

H

L

H

H

odd byte

Don’t care

Note: X → L or H