PD6710/’22 — ISA-to-PC-Card (PCMCIA) Controllers
Bits 1:0 — V 1 Power
PP
V
Bit 1
1 Power
PP
VPP_PGM
VPP_VCC
PC Card Intended Socket Function
Zero volts to PC Card socket V 1 pin
Bit 0
0
0
1
Inactive low
Inactive low
Inactive low
Active high1
PP
Selected card V to PC Card socket V
1
PP
CC
0
pin
1
1
0
1
Active high a
Inactive low
Inactive low
Inactive low
+12V to PC Card socket V 1 pin
PP
Zero volts to PC Card socket V 1 pin
PP
1. Under conditions where V 1 power is activated. See “Power Control” on page 48.
PP
These bits are intended to be used to control the power to the VPP1 pin of the PC Card.
Bit 4 — V Power
CC
Power is not applied to the card: the -VCC_3 and -VCC_5 socket power control pins are
inactive high.
0
1
Power is applied to the card: if bit 5 is ‘0’, or bit 5 is ‘1’ and -CD2 and -CD1 are active low,
then the selected -VCC_3 or -VCC_5 socket power control pin is active low.
Depending on the value of bit 5 below, setting this bit to ‘1’ will cause power to be applied to the
card. The VCC 3.3V bit (see bit 1, “Misc Control 1” on page 70) determines whether 3.3V or 5V
power is applied.
Bit 5 — Auto-Power
V
and V 1 power control signals are activated independent of the socket’s -CD2 and -
PP
CC
0
1
CD1 input levels.
V
and V 1 power control signals are only activated if the socket’s -CD2 and -CD1 inputs
CC
PP
are active low.
When this bit is set to ‘1’, the PD67XX causes power to the card to be turned on and off
automatically with the insertion and removal of a PC card from the socket.
Bit 7 — Card Enable
0
1
Outputs to card socket are not enabled and are floating.
Outputs to card socket are enabled if -CD1 and -CD2 are active low and bit 4 is ‘1’.
When this bit is ‘1’, the outputs to the PC Card are enabled if a card is present and card power is
being supplied. The pins affected include: -CE2, -CE1, -IORD, -IOWR, -OE, -REG, RESET,
A[25:0], D[15:0], and -WE (see Table 2).
50
Datasheet
INTEL [ INTEL ]
