Asus PCI-DA2100 User Manual - Page 187

Appendix D Appendix D Sync. Clock Period/Frequency 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 the Synchronous Clock Frequency, and "12" is called the Synchronous Clock Period. 1 20.8Mhz × 4ns = 1 20.8 ×106 × 4 ×10−9 = 12 1 12 × 4ns = 12 × 1 4 ×10 −9 = 20.8Mhz Synchronous Clock Period Synchronous Clock Frequency Synchronous Clock Period Synchronous Clock Frequency 10* 40 62 4.0 11* 30 75 3.3 12* 20 88 2.8 15 16.6 100 2.5 18 13.8 110 2.2 25 10.0 120 2.0 31 8.0 135 1.8 37 6.7 43 5.8 50 5.0 0 Asynchronous ∗ 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 187