TC1796
System Units (Vol. 1 of 2)
Peripheral Control Processor (PCP)
User’s Manual 11-23 V2.0, 2007-07
PCP, V2.0
Channel Suspend
Figure 11-9 illustrates the operation of a context save for a channel that is being
suspended. This is the same as for Channel Resume mode except that an interrupt
request is created to allow the channel to be restarted at a later time. This restore
operation utilizes one of three specially extended SRNs (see Page 11-70) to store the
interrupt request. The information stored as part of the interrupt request is the channel
number (SRPN), and the operating priority (CPPN) with which the channel was operating
prior to being suspended. This operation in conjunction with the suspended channel
restore operation shown in Figure 11-6 allows the temporary suspension of a channel
in favor of a higher-priority channel.
Figure 11-9 Context Save: Channel Suspend
MCA05674
31 16 0
CNT1
CPPN SRPN TOS
31 16 0
CNT1
CPPN SRPN TOS
Stored Content
CR6 in PRAM
31 16 0
CPC CFLAGS
Stored Content
CR7 in PRAM
CDPTR
31 16 0
0FLAGSDPTR
PCP
Register R7
16
PC
0
PCP Program
Counter
PCP
Register R6
31 16 0
SRPN
PCP Interrupt Service
Request Node.
PCP_SRNx (x = 9, 10, 11)
0
R
R
Q
SRNC 00
T
O
S
S
R
E
0
S
R
R
31 16 0
CPPN
PCP Interrupt
Control Reg.
PCP_ICR
0
ARB
CTL
PIPN 0 IE
0
SRPN
8
11
To Next Page
Loading...