White Electronic Designs
2. Task File register access specifications
WED7PxxxCFA70xxI25
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
Standby mode
Byte access (8bit)
Word access (16bit)
Odd byte access (8bit)
Note: X → L or H
REG#
X
L
L
L
L
CE2#
H
H
H
L
L
CE1#
H
L
L
L
H
A0
X
L
H
X
X
IORD#
X
L
L
L
L
IOWR#
X
H
H
H
H
OE#
X
H
H
H
H
WE#
X
H
H
H
H
D8 to D15
High-Z
High-Z
High-Z
odd byte
odd byte
D0 to D7
High-Z
even byte
odd byte
even byte
High-Z
Task File Register Write Access Mode (1)
Mode
Standby mode
Byte access (8bit)
Word access (16bit)
Odd byte access (8bit)
Note: X → L or H
REG#
X
L
L
L
L
CE2#
H
H
H
L
L
CE1#
H
L
L
L
H
A0
X
L
H
X
X
IORD#
X
H
H
H
H
IOWR#
X
L
L
L
L
OE#
X
H
H
H
H
WE#
X
H
H
H
H
D8 to D15
Don’t care
Don’t care
Don’t care
odd byte
odd byte
D0 to D7
Don’t care
even byte
odd byte
even byte
Don’t care
(2) Memory address map – Task File Register Read Access Mode (2)
Mode
Standby mode
Byte access (8bit)
Word access (16bit)
Odd byte access (8bit)
Note: X → L or H
REG#
X
H
H
H
H
CE2#
H
H
H
L
L
CE1#
H
L
L
L
H
A0
X
L
H
X
X
OE#
X
L
L
L
L
WE#
X
H
H
H
H
IORD#
X
H
H
H
H
IOWR#
X
H
H
H
H
D8 to D15
High-Z
High-Z
High-Z
odd byte
odd byte
D0 to D7
High-Z
even byte
odd byte
even byte
High-Z
Task File Register Write Access Mode (2)
Mode
Standby mode
Byte access (8bit)
Word access (16bit)
Odd byte access (8bit)
Note: X → L or H
REG#
X
H
H
H
H
CE2#
H
H
H
L
L
CE1#
H
L
L
L
H
A0
X
L
H
X
X
OE#
X
H
H
H
H
WE#
X
L
L
L
L
IORD#
X
H
H
H
H
IOWR#
X
H
H
H
H
D8 to D15
Don’t care
Don’t care
Don’t care
odd byte
odd byte
D0 to D7
Don’t care
even byte
odd byte
even byte
Don’t care
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
July 2005
Rev. 1
4
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
WEDC [ WHITE ELECTRONIC DESIGNS CORPORATION ]
