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T
T
T
S
S
S
1
1
1
G
G
G
~
~
~
3
3
3
2
2
2
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C
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133X CompactFlash Card
Transcend Information Inc.
9
Signal Name
Dir.
Pin
Description
-IOWR
(PC Card Memory Mode)
-IOWR
(PC Card I/O Mode)
-IOWR
(True IDE Mode – Except
Ultra DMA Protocol Active)
STOP
(True IDE Mode – Ultra DMA
Protocol Active)
I
35
This signal is not used in this mode.
The I/O Write strobe pulse is used to clock I/O data on the Card Data bus into
the CompactFlash Storage Card controller registers when the CompactFlash
Storage Card is configured to use the I/O interface.
The clocking shall occur on the negative to positive edge of the signal (trailing
edge).
In True IDE Mode, while Ultra DMA mode protocol is not active, this signal has
the same function as in PC Card I/O Mode. When Ultra DMA mode protocol is
supported, this signal must be negated before entering Ultra DMA mode
protocol.
In True IDE Mode, while Ultra DMA mode protocol is active, the
assertion of this
signal causes the termination of the Ultra DMA burst.
-OE
(PC Card Memory Mode)
-OE
(PC Card I/O Mode)
-ATA SEL
(True IDE Mode)
I
9
This is an Output Enable strobe generated by the host interface. It is used to
read data from the CompactFlash Storage Card in Memory Mode and to read
the CIS and configuration registers.
In PC Card I/O Mode, this signal is used to read the CIS and configuration
registers.
To enable True IDE Mode this input should be grounded by the host.
READY
(PC Card Memory Mode)
-IREQ
(PC Card I/O Mode)
INTRQ
(True IDE Mode)
O
37
In Memory Mode, this signal is set high when the CompactFlash Storage Card
is
ready to accept a new data transfer operation and is held low when the card is
busy.
At power up and at Reset, the READY signal is held low (busy) until the
CompactFlash Storage Card has completed its power up or reset function. No
access of any type should be made to the CompactFlash Storage Card during
this time.
Note, however, that when a card is powered up and used with RESET
continuously disconnected or asserted, the Reset function of the RESET pin is
disabled. Consequently, the
continuous assertion of RESET from the application
of power shall not cause the READY signal to remain continuously in the busy
state.
I/O Operation – After the CompactFlash Storage Card Card has been
configured for I/O operation, this signal is used as -
Interrupt Request. This line is
strobed low to generate a pulse mode interrupt or held low for a level mode
interrupt.
In True IDE Mode signal is the active high Interrupt Request to the host.