Fast Models Reference Manual - ARM Information Center

Peripheral and Interface Components
Library dependencies
The OrGate component has no dependencies on external libraries.
5.4.37 ICS307 component
The ICS307 component implements a programmer's view model of an ICS307 clock divider. It
can be used to convert the rate of one ClockSignal to another ClockSignal by application of
configurable multiplier, divider and scale values.
The Divider ratio can be set by startup parameters or at runtime by a configuration port. Changes
to the input ClockSignal rate and divider ratio are reflected immediately by the output
ClockSignal ports.
The divisor ratio is determined by three values:
• vdw
• rdw
• od.
To calculate the divisor ratio, use:
Divisor = ((rdw+2) * scale) / (2 * (vdw+8))
where scale is derived from a table indexed by od, shown in Table 5-104:
Table 5-104 od to scale conversion
od
scale
0 10
1 2
2 8
3 4
4 5
5 7
6 3
7 6
The default values of vdw, rdw and od are 4, 6 and 3 to give a default divisor rate of:
((6+2) * 4) / (2 * (4+8)) = 4/3
Figure 5-57 shows a view of the component in System Canvas.
This component is written in LISA+.
Figure 5-57 ICS307 in System Canvas
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