Fujitsu F2MC-16LX Hardware Manual page 91

Operation of Extended Intelligent I/O Service (EI
Figure 3.6-1 shows the operation of the EI
Figure 3.6-1 Operation of Extended Intelligent I/O Service (EI
CPU
2
ISD : EI OS descriptor
IOA : I/O address pointer
BAP : Buffer address pointer
2
ICS : EI OS channel select bit for Interrupt control register (ICR)
DCT : Data counter
(1) I/O demands forwarding.
(2) The interrupt controller selects the descriptor.
(3) Reads the transfer-source or transfer-destination from the descriptor.
(4) Forwarding between I/O and the memory is executed.
(5) The interruption factor is automatically clear.
Memory space
by IOA
I/O register
(3)
ISD
(3)
by BAP
(4)
Buffer
2
OS)
2
OS.
I/O register
Interrupt request
by ICS
(2)
Interrupt control register (ICR)
Interrupt controller
by DCT
CHAPTER 3 INTERRUPT
2
OS)
Peripheral
function (I/O)
(5)
(1)
75