Mips Technologies R4000 - Page 180

Chapter 5
150 MIPS R4000 Microprocessor User's Manual
Figure 5-23 Reset, Soft Reset & NMI Exception Handling (HW) and Servicing Guidelines (SW)
Reset, Soft Reset & NMI Exception Handling (HW)
Random <- TLBENTRIES - 1
Wired <- 0
Config <- Update(31:6)|| Undef(5:0)
Status:
BEV <- 1
TS <- 0
SR<- 0
ERL <- 1
ErrorEPC <- PC
PC <- 0xFFFF FFFF BFC0 0000
Status:
BEV <- 1
TS <- 0
SR<- 1
ERL <- 1
Soft Reset or NMI Exception Reset Exception
NMI Service Code
Soft Reset Service Code
NMI?
Reset Service Code
Yes
No
Status bit 20
= 1
=0
ERET(Optional)
Note: There is no indication from the
processor to differentiate between
there must be a system level indication.
(SR)
Reset, Soft Reset & NMI
Servicing Guidelines (SW)
NMI & Soft Reset;
CacheErr(EW) <- 0
(R4400 only)
CacheErr(EW) <- 0
(R4400 only)