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3.7.5
Processing Time of the Extended Intelligent I/O Service
2
(EI
OS)
The time required for processing the extended intelligent I/O service (EI
on setting of the extended intelligent I/O service descriptor (ISD).
2
• EI
OS status register (ISCS) setting
• Address (setting) pointed to by the I/O register address pointer (IOA)
• Address (setting) pointed to by the buffer address pointer (BAP)
• External data bus width for external access
• Transfer data length
Because the hardware interrupt is activated when data transfer by EI
the interrupt handling time is added.
■
Processing time (one transfer time) of the extended intelligent I/O service (EI
● When data transfer continues
2
The EI
OS processing time for data transfer continuation is shown in Table 3.7-2 based on the
2
EI
OS status register (ISCS) setting.
Table 3.7-2 Extended intelligent I/O service execution time
OS termination control bit (SE) setting Terminates due to termination
2
EI
IOA update/fixed selection bit (IF) setting
BAP address update/fixed
selection bit (BF) setting
Unit: Machine cycle (One machine cycle corresponds to one clock cycle of the machine clock, φ).
As shown in Table 3.7-3, interpolation is necessary for the EI
data transfer is continued depending on the EI
Table 3.7-3 Data transfer interpolation value for EI
I/O register address pointer
Buffer address pointer
B
: Byte data transfer
8
: External bus width using the 8-bit word transfer
Even : Even-numbered address word transfer
Odd : Odd-numbered address word transfer
request from the peripheral
Fixed
Fixed
32
Updated
34
2
OS execution time
B/Even
Internal
access
Odd
B/Even
External
access
8/Odd
CHAPTER 3 INTERRUPT
Ignores termination request
from the peripheral
Update
Fixed
34
36
2
OS processing time when the
2
OS execution condition.
Internal access
B/Even
Odd
0
+2
+2
+4
+1
+3
+4
+6
2
OS) depends
2
OS terminates,
2
OS)
Update
33
35
35
37
External access
B/Even
8/Odd
+1
+4
+3
+6
+2
+5
+5
+8
87
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