Intel 386 - Manual (Page 133)

Intel386™ EX EMBEDDED MICROPROCESSOR USER’S MANUAL
6-20
Figure 6-7. Complete Bus States (Including Pipelined Address)
A2376-02
HOLD Asserted
READY# Asserted •
HOLD Asserted
HOLD Negated •
Request Pending
READY# Asserted •
HOLD Asserted
HOLD Negated • No Request
Reset
Asserted
HOLD Negated •
No Request
HOLD Asserted
READY# Negated •
NA# Negated
READY# Asserted •
HOLD Negated •
Request Pending
Always NA# Negated
READY# Asserted •
HOLD Negated •
Request Pending
NA# Asserted •
(HOLD Asserted + No Request)
Request Pending •
HOLD Negated
READY# Asserted •
HOLD Negated •
No Request
(No Request + HOLD Asserted) •
NA# Asserted •
READY# Negated
READY# Negated •
(No Request +
HOLD Asserted)
READY# Negated
READY# Negated •
NA# Asserted • HOLD Negated • Request Pending
READY# Negated • Request Pending •
HOLD Negated
READY# Asserted
T2P
T2i
T2 T1P T1 Ti
Th
Bus States:
T1—first clock of a non-pipelined bus cycle.
T2—subsequent clock of a bus cycle when NA# has
not been sampled active in the current bus cycle.
T2i—subsequent clocks of a bus cycle when NA# has
been sampled active in the current bus cycle and there
is not yet an internal bus request pending.
T2P—subsequent clocks of a bus cycle when NA# has
been sampled active in the current bus cycle and there
is an internal bus request pending.
T1P—first clock of a pipelined bus cycle.
Ti—idle state.
Th—hold acknowledge state.
REA
DY#
Assert
ed • HOLD Negated • No Req
uest
NA# Asserted • HOLD Negated • Request Pending