Libraries GuideChapter 4: Design Elements (CAPTURE_SPARTAN2 to DECODE64)
CK_DIV
Internal Multiple-Frequency Clock Divider
XC3000
| XC4000E
| XC4000X
| XC5200
| XC9000
| Spartan
| SpartanXL
| Spartan2
| Virtex
|
|---|
N/A
| N/A
| N/A
| Primitive
| N/A
| N/A
| N/A
| N/A
| N/A
|
CK_DIV divides a user-provided external clock signal with different divide factors on either or both of the outputs. Only one CK_DIV may be used per design. The CK_DIV is not available if the OSC5 element is used.
The clock frequencies of the OSC1 and OSC2 outputs are determined by specifying the DIVIDE1_BY=n1 attribute for the OSC1 output and the DIVIDE2_BY=n2 attribute for the OSC2 output. n1 and n2 are integer numbers by which the clock input (C) is divided to produce the desired output clock frequency. The available values of n1 and n2 are shown in the following table.
n1
| n2
|
|---|
4
| 2
|
16
| 8
|
64
| 32
|
256
| 128
|
| 1,024
|
| 4,096
|
| 16,384
|
| 65,536
|
