Operation; Figure 7.6.3A Ei2Os Operation Flow - Fujitsu F2MC-16LX MB90580 Series Hardware Manual

7.6.3 Operation

.
Interrupt request issued
from internal resource
Reading ISD/ISCS
End request from resource
Data indicated by IOA
Memory indicated by BAP
Setting S1 and S0 to '00'
CPU operation return
MB90580 Series
NO
ISE = 1
YES
NO
YES
DIR = 1
NO
⇓
(Data transfer)
YES
IF = 0
NO
YES
BF = 0
NO
Decrementing DCT
YES
DCT = 00
NO
Clearing resource
interrupt request
Figure 7.6.3a EI
7.6 Extended intelligent I/O service (EI2OS)
BAP
I/OA
ISD
ISCS
DCT
ISE
S1 and S0 :
Interrupt sequence
YES
Data indicated by BAP
⇓
(Data transfer)
Memory indicated by IOA
Update value
Updating IOA
depends on BW.
Update value
Updating BAP
depends on BW.
Setting S1 and S0 to '01'
Clearing ISE to '0'
Interrupt sequence
2
OS operation flow
: Buffer address pointer
: I/O address pointer
2
: EI OS descriptor
2
: EI OS status
: Data counter
2
: EI OS enable bit
2
EI OS end status
SE = 1
Setting S1 and S0 to '11'
Chapter 7: Interrupt 97