TR5-Lite User Manual
64
June 20, 2018
new_hs_div = 4'b0100 ;
new_n1 = 8'b0000_0100 ;
fdco = 28'h005_0910 ;
end
3'h6 : //644.53125Mhz
begin
new_hs_div = 4'b0100 ;
new_n1 = 8'b0000_0010 ;
fdco = 28'h005_0910 ;
end
default : //100Mhz
begin
new_hs_div = 4'b0101 ;
new_n1 = 8'b0000_1010 ;
fdco = 28'h004_E200 ;
end
endcase
end
Users can get a desired frequency output from si570 by modifying these three parameters :
new_hs_div
,
new_n1
and
fdco
.
Detailed calculation method is in following equation:
fdco = output frequency * new_hs_div * new_n1 * 64
There are three constraints for the equation:
1.
4850 < output fequency * new_hs_div * new_n1 < 5600
2.
4 <= new_hs_div <= 11
3.
1 <= new_n1 < =128
For example, you want to get a 133.5 mhz clock, then
fdco = 133.5 x 4 x 10 x 64 = 341760d = 0x53700
Содержание TR-5 Lite FPGA
Страница 1: ...TR5 Lite User Manual 1 www terasic com June 20 2018...
Страница 71: ...TR5 Lite User Manual 71 www terasic com June 20 2018 Figure 5 9 CDCM 61004 Demo Figure 5 10 Si570 Demo...
Страница 85: ...TR5 Lite User Manual 85 www terasic com June 20 2018 Figure 7 5 Transceiver Loopback Test in Progress...