 50 pin CompacFlash FEMALE connector at the controller | Shown looking into card
| Function |
|
|
|
Function |
| Mem |
I/O |
True IDE
Mode 4 |
|
Pin |
|
Mem |
I/O |
True IDE
Mode 4 |
| GND |
--- |
1 |
26 |
--> |
!CD1 |
| D03 |
<-> |
2 |
27 |
<-> |
D11 |
| D04 |
<-> |
3 |
28 |
<-> |
D12 |
| D05 |
<-> |
4 |
29 |
<-> |
D13 |
| D06 |
<-> |
5 |
30 |
<-> |
D14 |
| D07 |
<-> |
6 |
31 |
<-> |
D15 |
| !CE1 |
!CS0 |
--> |
7 |
32 |
<-- |
!CE2 |
!CS1 |
| A10 |
L |
--> |
8 |
33 |
--> |
!VS1 |
| !OE |
!ATA
SEL |
--> |
9 |
34 |
<-- |
NU |
!IORD |
| A09 |
L |
--> |
10 |
35 |
<-- |
NU |
!IOWR |
| A08 |
L |
--> |
11 |
36 |
<-- |
!WE |
| A07 |
L |
--> |
12 |
37 |
--> |
RDY/BSY |
IREQ |
INTRQ |
| VCC |
--- |
13 |
38 |
--- |
VCC |
| A06 |
L |
--> |
14 |
39 |
<-- |
!CSEL |
| A05 |
L |
--> |
15 |
40 |
--> |
!VS2 |
| A04 |
L |
--> |
16 |
41 |
<-- |
RESET |
!RESET |
| A03 |
L |
--> |
17 |
42 |
--> |
!WAIT |
IORDY |
| A02 |
--> |
18 |
43 |
--> |
NU |
!INPACK |
NC |
| A01 |
--> |
19 |
44 |
<-- |
!REG |
H |
| A00 |
--> |
20 |
45 |
<-> |
BVD2(H) |
!SPKR |
!DASP |
| D00 |
<-> |
21 |
46 |
<-> |
BVD1(H) |
!STSCHG |
!PDIAG |
| D01 |
<-> |
22 |
47 |
<-> |
D08 |
| D02 |
<-> |
23 |
48 |
<-> |
D09 |
| WP |
!IOIS16 |
!IOCS16 |
--> |
24 |
49 |
<-> |
D10 |
| !CD2 |
<-- |
25 |
50 |
--- |
GND |
|
Essential for
minimal
8-bit interface. |
|
Essential for
16-bit interface. |
|
Connector
Pin pitch is 0.05". So it is best suited to surface
mount. It is more convenient to lay out PCB tracks so that they
approach from both edges instead of interleaving them as is
usually done for ATA/IDE connectors.
In the UK, CPC sell CF headers, part ref CN5037.
See http://www.compactflash.org/
for the definitive specification.
Notes
CF combines features from ISA bus, 16-bit PCMCIA, and ATA/IDE
buses. It can appear as I/O mapped, memory mapped, or as an IDE
device. The IDE mode is always 16-bit, but I/O and memory modes
can present data as 8 or 16-bits. These features make it the most
flexible choice, allowing it to be used by devices other than the
PC - such as 8-bit processors in consumer electronics.
The memory-mapped mode occupies 1K of address space, the top
half containing the selected page of data.
- You can access all data on the card, through 8 or 16 bit
data bus.
- L = Low logic
- H = High logic
- NC = No Connection
- NU = Not Used
- D08-D15 required only for 16 bit access and not required
when installed in 8-bit systems.
1. Devices should allow for 3-state signals not to consume
current.
2. Should be grounded by the host.
3. Should be tied to VCC by the host.
4. Optional for CF+ Cards, required for CompactFlash Storage
Cards.
* indicates active low signal
| |
|
| GND |
Ground reference voltage. |
| VCC
|
Power rail, usually 3V3, but can be 5V. The Compact
Flash FAQ says: "CompactFlash
cards support both 3.3V and 5V operation and can be
interchanged between 3.3V and 5V systems. This means that
any CF card can operate at either voltage. Other small
form factor flash cards may be available to operate at
3.3V or 5V, but any single card can operate at only one
of the voltages"
This seems to give permission to wire CF cards into 5V
systems. This would also be a wise design choice in the
CF spec, because consumers avoid the hassle of making
sure they have the "right voltage" card.
|
| D0...15 |
Data bus. |
| A0...10
|
Address bus. |
| RESET
|
System Reset. |
Source Code
Sandisk"s
design page has a freeware ATA Driver / FAT
File System, and a circuit diagram for an IDE to CF
adapter. The latter has no buffers, so it might be wise to avoid
loading it with long drive cables.
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