ISA-to-PC-Card (PCMCIA) Controllers — PD6710/’22
Table 1. ISA Bus Interface Pins (Sheet 4 of 4)
Pin Number
Pin Name
Description
Qty.
I/O
Pwr. Drive
PD6710
PD6722
Speaker Out / Chip Select: This I/O pin can
be used as a digital output to a speaker to
allow a system to support a PC Card’s -
SPKR pin for fax/modem/voice and audio.
During reset this pin also serves as a chip-
configuration input.
If the level on this pin is low when
PWRGOOD rises, the PD6710 is configured
to support cards as a PC Card Socket 2
device, and the PD6722 is configured to
support cards as PC Card Socket 2 and
Socket 3 devices.
If the level on this pin is high when
PWRGOOD rises, the PD6710 is configured
to support cards as a PC Card Socket 0
device, and the PD6722 is configured to
support cards as PC Card Socket 0 and
Socket 1 devices.
I/O-
PU
SPKR_OUT*/
C_SEL
142
202
1
4
12 mA
This pin is internally pulled up during reset
so that default configuration of the chip as a
Socket 0 (and Socket 1 for PD6722) is
facilitated. Adhere to the minimum pulse-
width timing specification for PWRGOOD to
allow the internal pull-up to operate and
ensure the default configuration. Refer to
“Bit 6 — Socket Index” on page 41 for more
information on chip configuration.
After reset operations have completed, this
pin defaults to high-impedance, and can
then be enabled as a totem-pole speaker
output by the setting of a card socket’s
Speaker Enable bit (Misc Control 1
register, bit 4). This output then becomes
the negative polarity XOR of each socket’s
BVD2/-SPKR/-LED input that has its
Speaker Enable bit set. For a description of
socket index values, refer to Table 11.
Clock: This input is connected to the ISA
bus OSC signal. A 14.318-MHz signal is
used to derive the internal 25-MHz clock
used for all socket timing. Alternately, a 25-
MHz clock source can be directly connected
and the internal synthesizer bypassed.
CLK
102
163
1
I
4
–
In default mode this is a status input that can
be used by software as an indication that the
V
power supply is stable.
PP
-VPP_VALID
ISA_VCC
4
3
1
2
I
1
–
–
When the PD6722 is in DMA mode (see
Misc Control 2, bit 6), this input is connected
to the TC (Terminal Count) signal of the ISA
bus. In DMA mode, this signal is active-high.
System Bus V : This supply pin can be
CC
set to 3.3 or 5.0 V. The ISA Bus Interface pin
group (this table) operates at the voltage
applied to this pin independent of the
voltage applied to other pin groups.
76, 135
138, 195
PWR
–
Datasheet
19
INTEL [ INTEL ]
