16-13
MB86R02 ‘Jade-D’ Hardware Manual V1.64
RESET
HOST DO
CMD
HOST SCK
HOST XCS
HOST DI
S
Reset
Rx
RDY
ABL1 ABL0 DBL2 DBL1 DBL0 R/W CNT1 CNT0
x
x
x
1
0
x
RESET
RESET
x
x
x
need Reset Frame
Figure 16-19 Reset Request
16.5.1.4.5. Deadlock Scenario
16.1.1.1.3
Situation recognition and recommendations
This section describes a deadlock scenario (at internal points and in the interfaces) of the
MB86R02.
HOST
HOST-IF
AHB
Slave
Slave
D.L point R1
D.L point R2
D.L point R3
D.L point T1
D.L point T2
D.L point T3
Soft
TIMER
Cmdlist
INT
ALL
RST
detect
RST CMD
CRG
CMDSEQ
Watch Dog
TIMER
CCNT
Figure 16-20 Deadlock locations (points)
D.L point R1
D.L point R2
D.L point R3
D.L point T1
D.L point T2
D.L point T3
in HOST or IF
in HOST-IF
in AHB BUS
HOST-IF
AHB
Status to HOST
Idol
Idol
don't send
Deadlock detection
Soft TIMER
WDT
detect *1
detect
Deadlock
Idol or Deadlock
Idol or Deadlock
detect
detect
waiting resp
Deadlock
send wait Sts0
detect
detect
Cause of
Deadlock
in Slave
in AHB BUS
in HOST-IF or IF
waiting resp waiting resp
send wait Sts0
detect
detect
detect
not detect *2
not detect *2
not detect *2
Deadlock
point
waiting resp
Deadlock
send wait Sts0
Deadlock
Idol or Deadlock
Deadlock
The MB86R02 device signals the completion of a normal access via the STATUS byte. If a
deadlock situation occurs, the device can be automatically recovered using a watchdog (WDT)
mechanism. The command list can be used to select whether watchdog reactivation is executed
or not.
It is also possible to monitor a MB86R02 deadlock using the timer under the control of the host
CPU software. The host CPU can reset the MB86R02 by using a CMD byte. We strongly
recommend that you use a host CPU issued reset because the the host CPU can not detect a
Содержание MB86R02
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