SA1110 Datasheet, PDF (103/406 Pages) Intel Corporation – Intel StrongARM SA-1110 Microprocessor

System Control Module
Table 9-2.
SA-1110 Power and Clock Supply Sources and States During Power-Down Modes
Power Management Mode
Module
CPU
MMUs (I&D)
Write buffer
Read buffer
JTAG
OS timer
LCD controller
Serial channel 0-4
Memory and
PCMCIA
control
Real-time clock
Interrupt
controller
Power manager
General-purpose I/O
Pin pads
Supply Source
Pwr
Clk
VDD
3.6864
MHz
VDDX
32.768
kHz
Run
Pwr
Clk
Idle
Pwr
Clk
Stopped
On
Running
On
Running
Sleep
Pwr
Clk
Disabled
Stopped
On
Running
9.5.6
Pin Operation in Sleep Mode
The SA-1110 pins are categorized by the following types based on their behavior during sleep mode:
• Type 1 – These pins are outputs and are driven low during sleep. These pins hold their state
after sleep mode is exited until the DRAM_control_hold bit in the PSSR is cleared.
• Type 1b – These pins are outputs and are driven low during sleep. These pins are actively
driven immediately after sleep mode is exited.
• Type 2 – These pins are outputs and are normally driven to a one in sleep. To support systems
that power down external devices, these pins can also be tristated in sleep through the use of
the FLOAT_STATIC and FLOAT_PCMCIA bits in the PCFR. See the Section 9.5, “Power
Manager” on page 9-26.
• Type 2b – These pins are outputs and are normally driven to a one in sleep. These pins are
actively driven immediately after sleep mode is exited.
• Type 3 – These pins are I/O pins. When programmed as outputs, they can be actively held high
or low during sleep. When programmed as inputs, they are actively sampled by the SA-1110.
• Type 4 – These pins are I/O pins but become inputs during sleep. They can be programmed to
hold the pin state at a zero or can be tristated. The receivers on these pins are disabled during
sleep. These pins hold their state after sleep mode is exited until the peripheral_control_hold
bit in the PSSR is cleared.
• Type 5 – These pins are outputs and are actively driven during sleep.
• Type 6 – These pins are outputs and are tristated during sleep.
SA-1110 Developer’s Manual
9-33