spd6722qcce Intel Corporation, spd6722qcce Datasheet - Page 73

• Manufacturer Part Number: spd6722qcce
• Description: Isa-to-pc-card Pcmcia Controllers
• Manufacturer: Intel Corporation

Datasheet
Note: This bit should be set to ‘0’ if in Memory Card Interface mode. This bit determines whether -SPKR
Bit 0 — Bypass Frequency Synthesizer
This bit determines internal time base.
Bit 1 — Low-Power Dynamic Mode
This bit determines whether Low-Power Dynamic mode is enabled. For maximum operational
power savings, keep this bit set to ‘1’.
Bit 2 — Suspend
This bit enables Suspend mode. After entering Suspend, AEN should be pulled high for lowest
power consumption. When this bit is high and AEN is high, all ISA bus interface inputs are turned
off. In 82386SL systems when the processor is in Suspend mode, the ISA bus interface signals
float; this feature will prevent high current flow in the PD67XX inputs.
Bit 3 — 5V Core
This bit selects input threshold circuits for use when 3.3 or 5.0 volts is connected to the PD67XX
CORE_VDD pins. This bit must be set to ‘0’ when the CORE_VDD pins are connected to 3.3 volts
to preserve TTL-compatible input thresholds to the card socket.
Bit 4 — Drive LED Enable
is used to drive an LED on the IRQ12 (
0
1
0
1
0
1
0
1
0
1
Normal operation, internal clock = CLK input frequency x 7/4.
Internal clock = CLK input frequency (see
Clock runs always.
Normal operation, stop clock when possible.
Normal operation.
Stop Frequency Synthesizer, enable all Low-Power modes and disable socket access.
Normal operation: use when CORE_VDD pin is connected to 3.3 volts.
Selects input thresholds for use when 5.0 volts is connected to the PD67XX CORE_VDD pins.
IRQ12 operates normally.
IRQ12 becomes an open-drain output suitable for driving an LED (driven whenever the card -
SPKR output is turned on, and the corresponding Speaker Is LED input bit (see
Speaker Is LED Input” on page
ISA-to-PC-Card (PCMCIA) Controllers — PD6710/’22
Table
76) is set).
1) for disk drives.
Table
1).
“Bit 1 —
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