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S5-95F
The ISTACK comprises system data words SD 203 to SD214. Table 14-4 shows which system data
word contains which ISTACK entry.
Table 14-4. ISTACK Entries in System Data Words 203 to 214
System Data Word
(SD)
SD 203
SD 204
SD 205
SD 206
SD 207
SD 208
SD 209
SD 210
SD 211
SD 212
SD 213
SD 214
*
Contains the absolute memory address of the next statement to be executed or the block start address of the errored block.
A parameter assignment error is indicated if the SAC points to an address in DB1 (see section 9.1). DB1 is specified as
block in the ISTACK.
Contents of the Interrupt Condition Code Word (UAW)
15
14
13
12
STOPS
u
SUF TRAF NNN
u: Unassigned
Figure 14-3. Contents of the Interrupt Condition Code Word
EWA 4NEB 812 6210-02
Testing the User Program and Storing It on the Memory Submodule
ISTACK Entry
ACCU1
ACCU2
Instruction register
Step address counter (SAC)
Block stack pointer
Data block start address
Nesting depth (0 to 6) and nesting level
2nd and 3rd nesting level
4th and 5th nesting level
6th nesting level
Condition code bits
Interrupt condition code word
(see Figure 14-3)
11
10
9
8
STS
STUEB
u
*
7
6
5
4
NAU
u
u
ZYK
Absolute Address
S5-95F
5E96
H
5E98
H
5E9A
H
5E9C
H
5E9E
H
5EA0
H
5EA2
H
5EA4
H
5EA6
H
5EA8
H
5EAA
H
5EAC
H
3
2
1
0
u
PEU BAU ASPFA
SD
214
14-7
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