Processing Time Of The Extended Intelligent I/O Service (Ei 2 Os) - Fujitsu MB90460 Series Hardware Manual

7.6.5 Processing Time of the Extended Intelligent I/O Service
2
(EI OS)
The time required for processing the extended intelligent I/O service (EI
according to the following factors:
2
• EI OS status register (ISCS) setting
• Address (area) pointed to by the I/O register address pointer (IOA)
• Address (area) pointed to by the buffer address pointer (BAP)
• External data bus length for external access
• Transfer data length
Because the hardware interrupt is activated when data transfer by EI
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 7.6-2 based on the EI
register (ISCS) setting.
Table 7.6-2 Extended Intelligent I/O Service Execution Time
2
EI OS termination control bit (SE) setting
IOA update/fixed selection bit (IF) setting
BAP address update/fixed selec-
tion bit (BF) setting
Unit:Machine cycle (One machine cycle corresponds to one clock cycle of the machine clock, φ).
As shown in Table 7.6-3, interpolation is necessary depending on the EI
Table 7.6-3 Data Transfer Interpolation Value for EI
I/O register address pointer
Internal access
Buffer address
pointer
External access
B: Byte data transfer
8: External bus using the 8-bit word transfer
Even: Even-numbered address word transfer
Odd: Odd-numbered address word transfer
Terminates due to termination
request from the peripheral
Fixed
Fixed 32
Update 34
2
OS Execution Time
Internal access
B/Even
B/Even 0
Odd +2
B/Even +1
8/Odd +4
CHAPTER 7 INTERRUPT
2
OS terminates, the
Ignores termination request
from the peripheral
Update Fixed
34 33
36 35
2
OS execution condition.
External access
Odd B/Even
+2 +1
+4 +3
+3 +2
+6 +5
2
OS) changes
2
OS)
2
OS status
Update
35
37
8/Odd
+4
+6
+5
+8
147