80960CA-25 Datasheet, PDF (34/62 Pages) Intel Corporation – SPECIAL ENVIRONMENT 80960CA-25, -16 32-BIT HIGH-PERFORMANCE EMBEDDED PROCESSOR

SPECIAL ENVIRONMENT 80960CA-25 -16
5 0 RESET BACKOFF AND HOLD
ACKNOWLEDGE
Table 15 lists the condition of each processor output
pin while RESET is asserted (low)
Table 15 Reset Conditions
Pins
A31 2
D31 0
BE3 0
WR
ADS
WAIT
BLAST
DT R
DEN
LOCK
BREQ
DC
DMA
SUP
FAIL
DACK3 0
EOP3 0 TC3 0
State During Reset
(HOLDA Inactive)¹
Floating
Floating
Driven high (Inactive)
Driven low (Read)
Driven high (Inactive)
Driven high (Inactive)
Driven low (Active)
Driven low (Receive)
Driven high (Inactive)
Driven high (inactive)
Driven low (Inactive)
Floating
Floating
Floating
Driven low (Active)
Driven high (Inactive)
Floating (Set to input mode)
NOTES
1 With regard to bus output pin state only the Hold Ac-
knowledge state takes precedence over the reset state
Although asserting the RESET pin will internally reset
the processor the processor’s bus output pins will not
enter the reset state if it has granted Hold Acknowledge
to a previous HOLD request (HOLDA is active) Further-
more the processor will grant new HOLD requests and
enter the Hold Acknowledge state even while in reset
For example if HOLDA is inactive and the processor is
in the reset state then HOLD is asserted the process-
sor’s bus pins enter the Hold Acknowledge state and
HOLDA is granted The processor will not be able to
perform memory accesses until the HOLD request is re-
moved even if the RESET pin is brought high This op-
eration is provided to simplify boot-up synchronization
among multiple processors sharing the same bus
Table 16 lists the condition of each processor output
pin while HOLDA is asserted (low)
Table 16 Hold Acknowledge and Backoff
Conditions
Pins
A31 2
D31 0
BE3 0
WR
ADS
WAIT
BLAST
DT R
DEN
LOCK
BREQ
DC
DMA
SUP
FAIL
DACK3 0
EOP3 0 TC3 0
State During HOLDA
Floating
Floating
Floating
Floating
Floating
Floating
Floating
Floating
Floating
Floating
Driven (High or low)
Floating
Floating
Floating
Driven high (Inactive)
Driven high (Inactive)
Driven (If output)
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