Ei 2 Os Processing Time - Fujitsu MB90895 Series Hardware Manual

2
3.5.15 EI OS Processing Time
The time required for EI
2
• Setting of EI OS status register (ISCS)
• Data length of transfer data
Some interrupt handling time is required at the transition to hardware interrupt
processing after completion of data transfer.
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I EI
OS Processing Time (time for one transfer)
G
For continuous data transfer (DCT ≠ 0, ISCS: SE=0)
2
The EI OS processing time at continuing data transfer is determined by the setting of the EI
register (ISCS) as shown in Table 3.5-10.
Table 3.5-10 Extended Intelligent I/O Service Execution Time
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Setting of the EI OS termination control bit
(SE)
Setting of the IOA updating/fixing select bit
(IF)
Setting of BAP address updating/
fixing select bit (BF)
Unit: One machine cycle is equal to one clock cycle of the machine clock (φ).
In addition, compensation is required depending on the conditions at executing EI
3.5-11.
Table 3.5-11 Compensation Value for Data Transfer at EI
Buffer address pointer
B: Byte data transfer
Even: Word transfer at even address
Odd: Word transfer at odd address
2
OS processing depends on the following factors:
Termination by the termination
request from a peripheral resource
fixed
fixed 32
Update 34
I/O Register Address Pointer
Internal Access
Update
34
36
2
OS Processing Time
Internal Access
B/even Odd
B/even 0 +2
Odd +2 +4
CHAPTER 3 CPU
2
OS status
The termination request from the
peripheral resource is ignored.
fixed Update
33 35
35 37
2
OS as shown in Table
87