Control Data Corporation CYBER 180 810 Maintenance And Parts Manual page 88

Register
Register
Maintenance Scan
*
Control Store
ODOO
OEOO
OFOO
0008
0009
OOOA
OOOB
oooc
OOOD
OOOE
OOOF
0
1
2
3
4
5
6
7
UM3ABF ·
UM3ABG
UM3ABH
UM4ABA
UM4ABB
UM4ABC
UM4ABD
UM4ABE
UM4ABF
UM4ABG
Description
Description
Invert execution
Data/address parity
Byte 2, 3
Invert execution
Data/address parity
Byte 4, 5
Invert execution
Data/address parity
Byte
6, 7
Invert PSR parity
Invert floating point
Exception index ROM parity
Invert floating point trap
Index ROM parity
Invert MAC bus data parity
Invert S adder latch parity
Not used
Not used
Not used
Control store halt
S Full
S.' Full
M
Full
M'
Full.
CYBER exchange request
Not next instruction
Select trap
Contents of control store can be ·read back through MAC and maintenance control
unit (MCU) for verification. Similarly, microcode can be loaded into control
store by MCU through MAC. The control store register has the same format as a
control store word.
*
Provides capability of reading a set of signals from CP after a
selectable number of clock intervals. A write function from MCH with type
code 4, register number 00 loads binary number of clock intervals into
maintenance scan limit counter.
5-12
60469500 B