TC1796
System Units (Vol. 1 of 2)
Peripheral Control Processor (PCP)
User’s Manual 11-16 V2.0, 2007-07
PCP, V2.0
Figure 11-3 Context Storage in PRAM
When choosing the Context Model for a given application, the following considerations
can be helpful. When choosing the small or the Minimum Context Models, save and
restore operations for registers not handled in the automatic context operations can still
be handled through explicit load and store instructions under control of the user. This
may be advantageous for applications in which the majority of the channels do not need
4 Words
not used
Context
#1
PRAM
Memory
8 Words
not used
Context
#1
Context
#2
MCA05668
Full Context
SRPN = 1
CR7
CR6
CR5
CR4
CR3
CR2
CR1
CR0
00
H
08
H
10
H
SRPN = 2
CR7
CR6
CR5
CR4
CR3
CR2
CR1
CR0
n1×8
H
SRPN = n1
Context
#n1
31 0
SRPN = 1
00
H
04
H
0C
H
CR7
CR6
CR5
CR4
CR7
CR6
CR5
CR4
08
H
Context
#2
SRPN = 2
Context
#3
SRPN = 3
Context
#n2
SRPN = n2
Small Context
31 0
Minimum Context
31 0
00
H
2 Words
not used
SRPN = 1
Context
#1
CR7
CR6
02
H
04
H
SRPN = 2
Context
#2
CR7
CR6
06
H
Context
#3
08
H
SRPN = 3
n3×2
H
Context
#n3
SRPN = n3
PRAM
Memory
PRAM
Memory
Note: All addresses in this figure are word addresses.
n2×4
H
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