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7.6.1
Extended Intelligent I/O Service (EI
The extended intelligent I/O service (EI
000100
to 00017F
H
■ Configuration of the Extended Intelligent I/O Service (EI
The ISD consists of 8 bytes x 16 channels. Each ISD has the structure shown in Figure 7.6-2. Table 7.6-1
shows the correspondence between channel numbers and ISD addresses.
+ 8 × ICS
000100
H
ISD start address
Table 7.6-1 Correspondence between Channel Numbers and Descriptor Addresses
Registers of the extended intelligent I/O service (EI
. The ISD consists of 8 bytes x 16 channels.
H
Figure 7.6-2 Configuration of EI
High-order 8 bits of data counter (DCTH)
Low-order 8 bits of data counter (DCTL)
High-order 8 bits of I/O address pointer (IOAH)
Low-order 8 bits of I/O address pointer (IOAL)
2
EI
OS status register (ISCS)
High-order 8 bits of buffer address pointer (BAPH)
Medium-order 8 bits of buffer address pointer (BAPM)
Low-order 8 bits of buffer address pointer (BAPL)
Channel
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
2
OS) descriptor (ISD) resides in internal RAM at
2
OS Descriptor (ISD)
Descriptor address
2
OS) descriptor (ISD)
CHAPTER 7 INTERRUPT
2
OS) Descriptor (ISD)
2
OS) Descriptor (ISD)
H
L
000100
H
000108
H
000110
H
000118
H
000120
H
000128
H
000130
H
000138
H
000140
H
000148
H
000150
H
000158
H
000160
H
000168
H
000170
H
000178
H
141
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