
12
Data Sheet
CompactFlash Card
SST48CF008 / 016 / 024 / 032 / 048 / 064 / 096 / 128 / 192 / 256
2001 Silicon Storage Technology, Inc.
S71125-03-000
9/01
375
-VS1
-VS2
(PC Card Memory Mode)
-VS1
-VS2
(PC Card I/O Mode)
-VS1
-VS2
(True IDE Mode)
-WAIT
(PC Card Memory Mode)
O
33
40
Voltage Sense Signals. -VS1 is grounded so that the CompactFlash
card CIS can be read at 3.3V and -VS2 is reserved by PCMCIA for a
secondary voltage.
This signal is the same for all modes.
This signal is the same for all modes.
O
42
The -WAIT signal is driven low by the CompactFlash
Card to signal the host to delay completion of a memory or I/O cycle
that is in progress.
This signal is the same as the PC Card Memory Mode signal.
-WAIT
(PC Card I/O Mode)
IORDY
(True IDE Mode)
In True IDE Mode this output signal may be used as IORDY.
-WE
(PC Card Memory Mode)
I
36
This is a signal driven by the host and used for strobing memory
write data to the registers of the CompactFlash card when the card is
configured in the memory interface mode. It is also used for writing
the configuration registers.
In PC Card I/O Mode, this signal is used for writing the configuration
registers.
In True IDE Mode this input signal is not used and should be con-
nected to V
DD
by the host.
Memory Mode - The CompactFlash card does not have
a write protect switch. This signal is held low after the completion
of the reset initialization sequence.
I/O Operation - When the CompactFlash card is configured for I/O
Operation Pin 24 is used for the -I/O Selected is 16 Bit Port (-IOIS16)
function. A Low signal indicates that a 16 bit or Odd Byte only opera-
tion can be performed at the addressed port.
In True IDE Mode this output signal is asserted low when this device
is expecting a word data transfer cycle.
-WE
(PC Card I/O Mode)
-WE
(True IDE Mode)
WP
(PC Card Memory Mode)
Write Protect
O
24
-IOIS16
(PC Card I/O Mode)
-IOIS16
(True IDE Mode)
T2-2.0 375
1. I = Input
0 = Output
TABLE
2-2: S
IGNAL
D
ESCRIPTION
(C
ONTINUED
) (4
OF
4)
Symbol
Type
1
Pin
Name and Functions