Terasic TR5-F40W User Manual page 62

 Using Si570 Controller IP
Table 5-3 lists the instruction ports of Si570 Controller IP
Port
iCLK
iRST_n
iStart
iFREQ_MODE
oController_Ready output
I2C_DATA
I2C_CLK
To use the Si570 Controller, the first thing users need to determine is the desired output frequency
in advance. The Si570 controller provides six optional clock frequencies. These options can be set
through an input port named "iFREQ_MODE" in Si570 controller. The specified settings with
corresponding frequencies are listed in
will configure Si570 to output 655.53 MHz clock.
When the output clock frequency is decided, the next thing users need to do is to enable the
controller to configure Si570. Before sending the enable signal to the Si570 controller, users need to
monitor an output port named "oController_Ready". This port indicates if Si570 controller is ready
to be configured or not. If it is ready, logic high will be outputted and the user will need to send a
high level logic to "iStart" port to enable the Si570 Controller as shown in
Si570 configuring, the logic level of "oController_Ready" is low; when it rises to high again that
TR5-F40W
Manual
Table 5-3 Si570 Controller Instruction Ports
Direction
input
input
input
input
inout
output
Table 5-4.
Table 5-4 Si570 Controller Frequency Setting
iFREQ MODE Setting
3'b000
3'b001
3'b010
3'b011
3'b100
3'b101
3'b110
3'b111
User
Description
System Clock (50Mhz)
Synchronous Reset (0: Module Reset, 1:
Normal)
Start to Configure（positive edge trigger）
Setting Si570 Output Frequency Value
Si570 Configuration status ( 0: Configuration in
Progress, 1: Configuration Complete)
I2C Serial Data to/from Si570
I2C Serial Clock to Si570
For example, setting "iFREQ_MODE" as 3'b110
Si570 Clock Frequency(MHz)
100
125
156.25
250
312.25
322.26
644.53125
100
62
Figure 5-4. During
www.terasic.com
June 20, 2018