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CHAPTER 3 SYSTEM CONTROLLER
236
Preliminary User’s Manual S14767EJ1V0UM00
3.2.2.12 Power Status Register (S_PWSR)
The Power Status Register “S_PWSR” is read-only and word aligned 32bit register. The IDLE filed in S_PWSR
indicates the status that it is ready to SUSPEND. The WKUP filed in S_PWSR indicates the wakeup request. When
IDLE field becomes one, V
R
4120A RISC Processor can disable the system clock for the corresponding device by
setting the STOP field in S_PWCR. When WKUP field in S_PWSR becomes one, V
R
4120A must enable the system
clock for the corresponding device by resetting the STOP field in S_PWCR. The S_WRCR is initialized to 0 at reset
and contains the following fields:
Bits
Field
Description
0
USBIDLE
This field indicate the IDLE status in USB Controller
0 = Not in IDLE state. It means USB Controller is NOT ready to SUSPEND.
1 = in IDLE state. It means USB Controller is ready to SUSPEND.
1
MACIDLE
This field indicate the IDLE status in Ethernet Controller #1
0 = Not in IDLE state. It means Ethernet Controller #1 is NOT ready to SUSPEND.
1 = in IDLE state. It means Ethernet Controller #1 is ready to SUSPEND.
2
ATMIDLE
This field indicates the IDLE status in ATM Cell Processor.
0 = Not in IDLE state. It means ATM Cell Processor is NOT ready to SUSPEND.
1 = in IDLE state. It means ATM Cell Processor is ready to SUSPEND.
3
MAC2IDLE
This field indicates the IDEL status in Ethernet Controller #2.
0 = Not in IDLE state. It means Ethernet Controller #2 is NOT ready to SUSPEND.
1 = in IDLE state. It means Ethernet Controller #2 is ready to SUSPEND.
7:4
Reserved
Hardwired to 0.
8
USBWKUP
This field indicate the wakeup request from USB Controller
0 = No wakeup request is pending.
1 = wakeup request is pending.
9
MACWKUP
This field indicate the wakeup request form Ethernet Controller #1
0 = No wakeup request is pending.
1 = wakeup request is pending.
10
ATMWKUP
This field indicates the wakeup request from ATM Cell Processor.
0 = No wakeup request is pending.
1 = wakeup request is pending.
11
MAC2WKUP
This field indicates the wakeup request from Ethernet Controller #2.
0 = No wakeup request is pending.
1 = wakeup request is pending.
31:12
Reserved
Hardwired to 0.