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T
T
T
S
S
S
1
1
1
6
6
6
G
G
G
~
~
~
6
6
6
4
4
4
G
G
G
C
C
C
F
F
F
4
4
4
0
0
0
0
0
0
400X CompactFlash Card
Transcend Information Inc.
V1.0
40
Attribute Memory Function
Attribute memory is a space where CompactFlash Storage Card identification and configuration information are
stored, and is limited to 8 bit wide accesses only at even addresses. The card configuration registers are also
located here. For CompactFlash Storage Cards, the base address of the Card configuration registers is 200h.
Function Mode DMA CMD
-REG
-CE2
-CE1
A10
A9
A0
-OE
-WE
D15-D8
D7-D0
Standby Mode Don’t Care
H H H X X X
X X High Z High Z
Standby Mode No X H H X X X
X X High Z High Z
UDMA Operation (see section
4.3.18: Ultra DMA Mode
Read/Write Timing
Specification)
Yes L
1
H H X X X
H H Odd Byte
Even
Byte
Read Byte Access CIS ROM
(8 bits)
No L H L
2
L L L L
2
H High Z
Even
Byte
Write Byte Access CIS (8 bits)
(Invalid)
No L H L
2
L L L H L
2
Don’t
Care
Even
Byte
Read Byte Access
Configuration CompactFlash
Storage (8 bits)
No L H L L H L L H High Z
Even
Byte
Write Byte Access
Configuration CompactFlash
Storage (8 bits)
No L H L L H L H L
Don’t
Care
Even
Byte
Read Word Access CIS (16
bits)
No L L
2
L
2
L L X
L
2
H Not Valid
Even
Byte
Write Word Access CIS (16
bits) (Invalid)
No L L
2
L
2
L L X
H L
2
Don’t
Care
Even
Byte
Read Word Access
Configuration CompactFlash
Storage (16 bits)
No L L
2
L
2
L H X
L
2
H Not Valid
Even
Byte
Write Word Access
Configuration CompactFlash
Storage (16 bits)
No L L
2
L
2
L H X
H L
2
Don’t
Care
Even
Byte
Notes: 1) In UDMA operation, the -REG (-DMACK) signal shall be asserted only in response to -DMARQ.
2) The -CE signals or both the -OE signal and the -WE signal shall be de-asserted between consecutive cycle operations.
Table: Attribute Memory Function