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E–18 Alpha Architecture Handbook
Table E–10: 21164/21164PC Select Desired Frequencies for OpenVMS Alpha and
DIGITAL UNIX
Table E–10 contains the selection definitions for each of the three counters. All frequency
fields are two-bit fields with the following values defined:
Bits Meaning When Set
63:10 MBZ
9:8 Counter 0 frequency:
7:6 Counter 1 frequency:
5:4 Counter 2 frequency:
3:0 MBZ
Value Meaning
0 Do not interrupt
1 Unused
2 Low frequency (2**16 (65536) events per interrupt)
3 High frequency (2**8 (256) events per interrupt)
Value Meaning
0 Do not interrupt
1 Unused
2 Low frequency (2**16 (65536) events per interrupt)
3 High frequency (2**8 (256) events per interrupt)
Value Meaning
0 Do not interrupt
1 Unused
2 Low frequency (2**14 (16384) events per interrupt)
3 High frequency (2**8 (256) events per interrupt)