SMCXXXAF Datasheet, PDF (18/82 Pages) Numonyx B.V – 32 Mbyte, 64 Mbyte, 128 Mbyte, 256 Mbyte and 512 Mbyte 3.3 V / 5 V supply CompactFlash™ card

Electrical interface
SMCxxxAF
Table 9. Signal description (continued)
Signal name
Direction
Pin
READY
(PC card memory mode)
O
–IREQ
(PC card I/O mode)
INTRQ
(True IDE mode)
–REG
(PC card memory mode)
–REG
I
(PC card I/O mode)
Reserved
(True IDE mode)
RESET
(PC card memory mode)
RESET
I
(PC card I/O mode)
–RESET
(True IDE mode)
V_CC
(PC card memory mode)
V_CC
(PC card I/O mode)
V_CC
(True IDE mode)
–VS1, –VS2
(PC card memory mode)
–VS1, –VS2
O
(PC card I/O mode)
–VS1, –VS2
(True IDE mode)
–WAIT
(PC card memory mode)
–WAIT
O
(PC card I/O mode)
IORDY
(True IDE mode)
37
44
41
13,38
33,40
42
Description
Indicates whether the card is busy (Low), or ready to
accept a new data transfer operation (High). The Host
socket must provide a pull-up resistor. At power-up and
reset, the READY signal is held Low until the commands
are completed. No access should be made during this
time. The READY signal is held High whenever the card
has been powered up with RESET continuously
disconnected or asserted.
Interrupt request. It is strobed Low to generate a pulse
mode interrupt or held Low for a level mode interrupt.
Active High Interrupt request to the host.
Used to distinguish between common memory and
register (attribute) memory accesses. High for common
memory, Low for attribute memory.
Must be Low during I/O cycles when the I/O address is on
the bus.
Not used, should be connected to V_CC by the host.
Resets the card (active High). The card is reset at power-
up only if this pin is left High or unconnected.
Same as PC card memory mode.
Hardware Reset from the host (active Low).
+5 V, +3.3 V power.
Same for all modes.
Same for all modes.
Voltage sense signals.–VS1 is grounded so that the CIS
can be read at 3.3 volts and –VS2 is reserved by PCMCIA
for a secondary voltage.
Same for all modes.
Same for all modes.
ST CF does not assert the WAIT (IORDY) signal.
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