SanDisk SDCFH-004G Product Manual - Page 22

Table 3-4, Signal Description

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Interface Description SanDisk CompactFlash Card OEM Product Manual The SanDisk CompactFlash Memory Card signals are described in Table 3-4. Table 3-4 Signal Description Signal Name Dir. Pin Description A10-A0 I 8, 10, 11, 12, 14, These address lines, along with the -REG (PC Card Memory Mode) (PC Card I/O Mode) 15, 16, 17, 18, 19, 20 signal, are used to select the following: I/O port address registers within the card, memorymapped port address registers within the card, a byte in the card's information structure and its configuration control and status registers. A2-A0 (True IDE Mode) I 18, 19, 20 In True IDE Mode only A[2:0] is used to select one of eight registers in the Task File. A10-A3 (True IDE Mode) In True IDE Mode these remaining address lines should be grounded by the host. BVD1 I/O (PC Card Memory Mode) 46 This signal is asserted high as the BVD1 signal since a battery is not used with this product. -STSCHG (PC Card I/O Mode) The Status Changed signal is asserted low to alert the host to changes in the RDY/-BSY and Write Protect states, while the I/O interface is configured. Its use is controlled by the Card Config. and Status Register. -PDIAG (True IDE Mode) In the True IDE Mode, this input/output is the Pass Diagnostic signal in the master/slave handshake protocol. BVD2 I/O (PC Card Memory Mode) 45 This output line is always driven to a high state in Memory Mode since a battery is not required for this product. -SPKR (PC Card I/O Mode) This output line is always driven to a high state in I/O Mode since this product does not support the audio function. -DASP (True IDE Mode) In the True IDE Mode, this input/output is the Disk Active/Slave Present signal in the master/ slave handshake protocol. -CD1, -CD2 O (PC Card Memory Mode) (PC Card I/O Mode) (True IDE Mode) 26, 25 These Card Detect pins are connected to ground on the card. They are used by the host to determine if the card is fully inserted into its socket. -CE1, -CE2 I (PC Card Memory Mode) (PC Card I/O Mode) 7, 32 The Card Enable input signals are used both to select the card and to indicate to the card whether a byte or a word operation is being performed. -CE2 always accesses the odd byte of the word. -CE1 accesses the even byte or the Odd byte of the word depending on A0 and -CE2. A multiplexing scheme based on A0, -CE1, -CE2 allows 8 bit hosts to access all data on D0-D7. -CS0, -CS1 (True IDE Mode) In True IDE Mode, -CS0 is the chip select for the Task File registers while -CS1 is used to select the Alternate Status Register and the Device Control Register. -CSEL I (PC Card Memory Mode) (PC Card I/O Mode) 39 This signal is not used for PC Card Memory Mode or PC Card I/O Mode. 02/07, Rev. 12.0 3-4 © 2007 SanDisk Corporation

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Interface Description
SanDisk CompactFlash Card OEM Product Manual
The SanDisk CompactFlash Memory Card signals are described in Table 3-4.
Table 3-4
Signal Description
Signal Name
Dir.
Pin
Description
A10-A0
(PC Card Memory Mode)
(PC Card I/O Mode)
A2-A0
(True IDE Mode)
A10-A3
(True IDE Mode)
I
I
8, 10, 11, 12, 14,
15, 16, 17, 18, 19,
20
18, 19, 20
These address lines, along with the -REG
signal, are used to select the following: I/O port
address registers within the card, memory-
mapped port address registers within the card,
a byte in the card's information structure and its
configuration control and status registers.
In True IDE Mode only A[2:0] is used to select
one of eight registers in the Task File.
In True IDE Mode these remaining address
lines should be grounded by the host.
BVD1
(PC Card Memory Mode)
-STSCHG
(PC Card I/O Mode
)
-PDIAG
(True IDE Mode
)
I/O
46
This signal is asserted high as the BVD1 signal
since a battery is not used with this product.
The Status Changed signal is asserted low to
alert the host to changes in the RDY/-BSY and
Write Protect states, while the I/O interface is
configured. Its use is controlled by the Card
Config. and Status Register.
In the True IDE Mode, this input/output is the
Pass Diagnostic signal in the master/slave
handshake protocol.
BVD2
(PC Card Memory Mode)
-SPKR
(PC Card I/O Mode
)
-DASP
(True IDE Mode
)
I/O
45
This output line is always driven to a high state
in Memory Mode since a battery is not required
for this product.
This output line is always driven to a high state
in I/O Mode since this product does not support
the audio function.
In the True IDE Mode, this input/output is the
Disk Active/Slave Present signal in the master/
slave handshake protocol.
-CD1, -CD2
(PC Card Memory Mode)
(PC Card I/O Mode
)
(True IDE Mode
)
O
26, 25
These Card Detect pins are connected to
ground on the card. They are used by the host
to determine if the card is fully inserted into its
socket.
-CE1, -CE2
(PC Card Memory Mode)
(PC Card I/O Mode)
-CS0, -CS1
(True IDE Mode)
I
7, 32
The Card Enable input signals are used both to
select the card and to indicate to the card
whether a byte or a word operation is being
performed.
-CE2 always accesses the odd
byte of the word. -CE1 accesses the even byte
or the Odd byte of the word depending on A0
and -CE2. A multiplexing scheme based on
A0, -CE1, -CE2 allows 8 bit hosts to access all
data on D0-D7.
In True IDE Mode, -CS0 is the chip select for
the Task File registers while -CS1 is used to
select the Alternate Status Register and the
Device Control Register.
-CSEL
(PC Card Memory Mode)
(PC Card I/O Mode)
I
39
This signal is not used for PC Card Memory
Mode or PC Card I/O Mode.
02/07, Rev. 12.0
3-4
© 2007 SanDisk Corporation