Datasheet

T
T
T
r
r
r
a
a
a
n
n
n
s
s
s
c
c
c
e
e
e
n
n
n
d
d
d
I
I
I
n
n
n
d
d
d
u
u
u
s
s
s
t
t
t
r
r
r
i
i
i
a
a
a
l
l
l
C
C
C
F
F
F
C
C
C
a
a
a
r
r
r
d
d
d
T
T
T
S
S
S
1
1
1
2
2
2
8
8
8
M
M
M
~
~
~
1
1
1
6
6
6
G
G
G
C
C
C
F
F
F
2
2
2
0
0
0
0
0
0
I
I
I
Transcend Information Inc.
V1.2
79
indicates that Multiword DMA mode 0 has been selected. Bit 9, if set to one, indicates that Multiword DMA
mode 1 has been selected. Bit 10, if set to one, indicates that Multiword DMA mode 2 has been selected.
Selection of Multiword DMA modes 3 and above are specific to CompactFlash are reported in word 163,
Word 163: CF Advanced True IDE Timing Mode Capabilities and Settings.
Bits 7 through 0 of word 63 of the Identify Device parameter information is defined as the Multiword DMA
data transfer supported field. If this field is supported, bit 1 of word 53 shall be set to one. This field is bit
significant. Any number of bits may be set to one in this field by the CompactFlash Storage Card to indicate
the Multiword DMA modes it is capable of supporting.
Of these bits, bits 7 through 2 are reserved. Bit 0, if set to one, indicates that the CompactFlash Storage
Card supports Multiword DMA mode 0. Bit 1, if set to one, indicates that the CompactFlash Storage Card
supports Multiword DMA modes 1 and 0. Bit 2, if set to one, indicates that the CompactFlash Storage Card
supports Multiword DMA modes 2, 1 and 0. Support for Multiword DMA modes 3 and above are specific to
CompactFlash are reported in word 163, Word 163: CF Advanced True IDE Timing Mode Capabilities and
Settings.
 Word 64: Advanced PIO transfer modes supported
Bits 7 through 0 of word 64 of the Identify Device parameter information is defined as the advanced PIO
data transfer supported field. If this field is supported, bit 1 of word 53 shall be set to one. This field is bit
significant. Any number of bits may be set to one in this field by the CompactFlash Storage Card to indicate
the advanced PIO modes it is capable of supporting.
Of these bits, bits 7 through 2 are reserved. Bit 0, if set to one, indicates that the CompactFlash Storage
Card supports PIO mode 3. Bit 1, if set to one, indicates that the CompactFlash StorageCard supports PIO
mode 4.
Support for PIO modes 5 and above are specific to CompactFlash are reported in word 163.
 Word 65: Minimum Multiword DMA transfer cycle time
Word 65 of the parameter information of the Identify Device command is defined as the minimum
Multiword DMA transfer cycle time. This field defines, in nanoseconds, the minimum cycle time that, if
used by the host, the CompactFlash Storage Card guarantees data integrity during the transfer.
If this field is supported, bit 1 of word 53 shall be set to one. The value in word 65 shall not be less than the
minimum cycle time for the fastest DMA mode supported by the device. This field shall be supported by all
CompactFlash Storage Cards supporting DMA modes 1 and above. If bit 1 of word 53 is set to one, but this
field is not supported, the Card shall return a value of zero in this field.
 Recommended Multiword DMA transfer cycle time
Word 66 of the parameter information of the Identify Device command is defined as the recommended
Multiword DMA transfer cycle time. This field defines, in nanoseconds, the cycle time that, if used by the
host, may optimize the data transfer from by reducing the probability that the CompactFlash Storage Card
will need to negate the DMARQ signal during the transfer of a sector.
If this field is supported, bit 1 of word 53 shall be set to one. The value in word 66 shall not be less than the
value in word 65. This field shall be supported by all CompactFlash Storage Cards supporting DMA modes
1 and above. If bit 1 of word 53 is set to one, but this field is not supported, the Card shall return a value of
zero in this field.

Word 67: Minimum PIO transfer cycle time without flow control
Word 67 of the parameter information of the Identify Device command is defined as the minimum PIO
transfer without flow control cycle time. This field defines, in nanoseconds, the minimum cycle time that, if
used by the host, the CompactFlash Storage Card guarantees data integrity during the transfer without
utilization of flow control. If this field is supported, Bit 1 of word 53 shall be set to one. Any CompactFlash
Storage Card that supports PIO mode 3 or above shall support this field, and the value in word 67 shall not
be less than the value reported in word 68. If bit 1 of word 53 is set to one because a CompactFlash
Storage Card supports a field in words 64-70 other than this field and the CompactFlash Storage Card
does not support this field, the CompactFlash Storage Card shall return a value of zero in this field.