ADSP-219x/2192 DSP Hardware Reference B-33
ADSP-2192 DSP Peripheral Registers
The CardBus Function Event registers are defined to inter-operate with
the PCI Power Management Control/Status (
SYSCON
) register as follows:
• PCI updates
PME_EN
bit.
CardBus
GWAKM
and
WKUPM
take the new value.
• PCI clears
PME_Status
(writes 1).
CardBus
GWAKE
is cleared.
• CardBus updates
GWAKM
or
WKUP
.
No effect in PCI
PMCSR
.
• CardBus clears
GWAKE_E
(writes 1).
PCI
PME_Status
bit is cleared.
• Power Management event occurs.
Both
GWAKE
and
PME_Status
are set;
PME
may assert.
• Host Interrupt occurs.
INTRE
is set,
INTA
may assert.
The CSTSCHG Signal
In CardBus systems, power management events are signaled to the host by
an active-high signal called
CSTSCHG
. An external FET or inverter is used
with the ADSP-2192’s active-low
PME
signal to create
CSTSCHG
. In CardBus
mode,
PME
is asserted under the following conditions:
• The function’s
INTRM
master interrupt/wakeup mask bit is 1
• The function’s
WKUPM
master wakeup mask bit is 1
