Appendix D Sync. Clock Period/Frequency - Asus PCI-DA2100 User Manual

Appendix D
Changes to the SCSI Synchronous Clock Period of each SCSI target is
a low-level control of the SCSI controller chip. There is no other
selectable option. Only the Synchronous Clock Period is available in
this field.
To calculate the Synchronous Clock Period, refer to the "Sample
equation" to get the correct Synchronous Clock Period.
Sample equation:
In this example,
where "20.8Mhz"
is called
Synchronous
Clock Frequency,
and "12" is called
the Synchronous
Clock Period.
Synchronous
Clock Period
10*
11*
12*
15
18
25
31
37
43
50
These three clock periods aren't in accordance with the sample
equation; they are specially defined in the SCSI-3 specification.
ASUS PCI-DA2100/PCI-DA2200 User's Manual
Sync. Clock Period/Frequency
1
20 8 . Mhz
the
1
12 4 ns
Synchronous
Clock
Frequency
40
30
20
16.6
13.8
10.0
8.0
6.7
5.8
5.0
4 ns 20 8 .
1
9
12 4 10
Synchronous
Clock Period
62
75
88
100
110
120
135
0
Appendix D
1
6 9
10 4 10
20 8 . Mhz
Synchronous
Clock
Frequency
4.0
3.3
2.8
2.5
2.2
2.0
1.8
Asynchronous
12
187