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3.8
Operation Flow of and Procedure for Using the Extended
Intelligent I/O Service (EI
Figure 3.8-1 shows the EI
■ EI
2
OS Operation Flow
2
OS operation flow. Figure 3.8-2 shows the EI
Figure 3.8-1 EI
Interrupt request issued
from internal resource
NO
ISE = 1
YES
Reading ISD/ISCS
End request from resource
NO
YES
DIR = 1
NO
Data indicated by IOA
(Data transfer)
⇓
Memory indicated by BAP
YES
IF = 0
NO
YES
BF = 0
NO
Decrementing DCT
YES
DCT = 00
B
NO
Setting S1 and S0 to "00
"
B
Clearing resource
interrupt request
CPU operation return
2
OS)
2
OS Operation Flow
BAP:
Buffer address pointer
IOA:
I/O address pointer
2
ISD:
EI
2
ISCS:
EI
DCT:
Data counter
2
ISE:
EI
OS enable bit
2
S1 and S0:
EI
Interrupt sequence
YES
SE = 1
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
"
B
Clearing ISE to "0"
Interrupt sequence
CHAPTER 3 INTERRUPTS
2
OS use flow.
OS descriptor
OS status
OS end status
Setting S1 and S0 to "11
"
B
77
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