Control Data Cyber 170 State Hardware Reference Manual page 24

Major System Component Descriptions
Execution Section
The
execution section combines the operands'to achieve the result.
Cache Memory
The cache memory consists of two sets of fast bipolar memory that are capable
of storing
2048
60-bit words. Cache memory can be expanded to four sets of
bipolar memory with a capacity of 4096 words. The memory addressing sections
determine whether a requested word is in the cache memory. If the word is not,
they read four consecutive words from central memory into the cache memory.
Addressing Section
The addressing section checks memory addresses against the CP registers RAC,
FLC,
RAE, and FLE to ensure isolation of user memory space.
Central Memory Control
.
Central memory control (CMC) is integrated within the CP. CMC controls the
flow of data between CM and requesting system components.