PD6710 Datasheet, PDF (50/138 Pages) Intel Corporation – ISA-to-PC-Card (PCMCIA) Controllers

PD6710/’22 — ISA-to-PC-Card (PCMCIA) Controllers
Bits 1:0 — V_PP1 Power
V_PP1 Power
Bit 1
Bit 0
VPP_PGM
VPP_VCC
PC Card Intended Socket Function
0
0
Inactive low
Inactive low Zero volts to PC Card socket V_PP1 pin
0
1
Inactive low
Active high¹
Selected card V_CC to PC Card socket V_PP1
pin
1
0
Active high ^a
Inactive low +12V to PC Card socket V_PP1 pin
1
1
Inactive low
Inactive low Zero volts to PC Card socket V_PP1 pin
1. Under conditions where V_PP1 power is activated. See “Power Control” on page 48.
These bits are intended to be used to control the power to the V_PP1 pin of the PC Card.
Bit 4 — V_CC Power
0
Power is not applied to the card: the -VCC_3 and -VCC_5 socket power control pins are
inactive high.
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 V_CC 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
0
V_CC and V_PP1 power control signals are activated independent of the socket’s -CD2 and -
CD1 input levels.
1
V_CC and V_PP1 power control signals are only activated if the socket’s -CD2 and -CD1 inputs
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
Outputs to card socket are not enabled and are floating.
1
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