Operation Of The Expanded Intelligent I/O Service (Ei 2 Os) - Fujitsu F2MC-16LX Hardware Manual

3.6.3 Operation of the Expanded Intelligent I/O Service (EI
Figure 3.6-7 shows the operational flow of the expanded intelligent I/O service (EI
while Figure 3.6-8 shows the procedural flow of the expanded intelligent I/O service
2
(EI OS).
■ Operational Flow of the Expanded Intelligent I/O Service (EI
Figure 3.6-7 Operational Flow of the Extended Intelligent I/O Service (EI
Termination request from the built-in resource
An interrupt request is
issued from a built-in
resource.
NO
ISE=1
YES
Read ISD/ISCS
NO
YES
DIR=1
NO
Data specified by IOA
(data transfer)
Memory specified by BAP
YES
IF=0
The updated value
NO
depends on the BW.
YES
BF=0
The updated value
NO
depends on the BW.
Decrement DCT
(-1)
YES
DCT=00
NO
Set "00" to S1 and S0
Clear the interrupt
request from the resource
Return to CPU operation
3.6 Expanded Intelligent I/O Service (EI
2
OS)
BAP: Buffer address pointer
IOA: I/O register address pointer
2
ISD: EI OS descriptor
2
ISCS: EI OS status
DCT: Data counter
2
ISE: EI OS enable bit
2
S1 and S0: EI OS termination status
Interrupt sequence
YES
SE=1
Data specified by BAP
(data transfer)
Memory specified by IOA
Update IOA
Update BAP
Set "01" to S1 and S0
Set ISE to "0" (clear)
Interrupt sequence
2
2
OS)
Set "11" to S1 and S0
2
OS)
OS)
2
OS),
77