USPIIi-1v Hardware Manual
7-2
Themis Computer
The system, or part of the system, may also be reset by a Watchdog Reset (WDR) or a Software-Initiated
Reset (SIR). These resets originate within the UltraSPARC-II
i
core and are only observed by the processor
core. Depending on the conditions and type of the reset, the processor may propagate the reset throughout the
system, in the case of a POR, or reset part of the system, i.e.: the processor core itself.
Note that, unlike other UltraSPARC based systems, the UltraSPARC-II
i
does not support a wake-up reset for
power management.
7.2
UltraSPARC-II
i
Reset Request Signals
The reset request signals accepted by the UltraSPARC-II
i
on the USPII
i
-1v board are explained in this
section. The signals are: Power-On Reset (POR), initiated when power is applied to the system or when a
Push-Button Reset is asserted; Externally Initiated Reset (XIR), initiated in response to a signal external to the
UltraSPARC-II
i
processor generally indicating a critical system event; Watchdog Reset (WDR), initiated in
response to the error_state; and Software Initiated Reset (SIR), initiated by software with the SIR command.
POR and XIR are received by the UltraSPARC-II
i
from the RIC while WDR and SIR are internally generated
by the UltraSPARC-II
i
and effect only the processor core. Reset priorities, from highest to lowest are: POR,
XIR, WDR, and SIR.
7.2.1
Power-On Reset (POR)
A POR is a processor and board reset. When POR is active all other resets and traps are ignored. Any pending
external transactions are cancelled.
The UltraSPARC-II
i
CPU will propagate this reset to all of the subsystems of the USPII
i
-1v, including the E-
Cache, FLASH, UPA64S, and through the Advanced PCI Bridge (APB) to PCI A and PCI B buses to all
other devices. All devices on the board are returned to their initialization states.
7.2.2
Externally Initiated Reset (XIR)
An XIR has a higher priority than all other interrupt, except POR. It is initiated by a source external to the
UltraSPARC-II
i
, such as an external component, and propagated to the UltraSPARC-II
i
via the RIC. The XIR
preserves the existing state of the board and, if the UltraSPARC-II
i
is in error_state, brings it to RED_state. A
system-wide reset does not occur.
7.2.3
Watchdog Reset (WDR)
On the USPII
i
-1v a Watchdog Reset (WDR) is generated in response to the error_state of the UltraSPARC-
II
i
. It is generated internally to the UltraSPARC-II
i
core. The UltraSPARC-II
i
will enter an error_state when
a trap occurs and Trap_Level = Max_Trap_Level - 1. A WDR reset performs a system reset; all pending and
in-progress hardware operations are cancelled or aborted. Hardware and firmware registers are unchanged
from before the WDR but may be in an inconsistent state as some operations have been aborted. If the
processor is in error_state, a WDR places it in RED_state.
Содержание USPIIi-1v
Страница 1: ...USPIIi 1v Hardware Manual Revision B4...
Страница 2: ......
Страница 6: ...USPIIi 1v User s Manual Themis Computer...
Страница 20: ...USPIIi 1v Hardware Manual 1 6 Themis Computer...
Страница 62: ...USPIIi 1v Hardware Manual 6 6 Themis Computer...
Страница 100: ...USPIIi 1v Hardware Manual A 32 Themis Computer...
Страница 105: ...Themis Computer B 5 B Jumper and Solder Bead Configurations Figure B 2 I O Board Jumper Locations...
Страница 115: ...Themis Computer D 1 D DBoardDiagrams D 1 Baseboard Board Diagrams...
Страница 126: ...USPIIi 1v Hardware Manual E 4 Themis Computer...
Страница 127: ...ThemisComputer 3185LaurelviewCourt Fremont CA94538 Attn PublicationsDepartment Place Stamp Here...