DLL Presets

Versal ACAP Technical Reference Manual (AM011)

Document ID
AM011
Release Date
2022-04-26
Revision
1.4 English

Software can use the DLL presets to automatically switch the DLL output frequency. There are three DLL presets. They are programmed using the SDx_DLL_DIV_MAP0 register. Software programs the SD_DLL_REF_CLK output frequency to 1200 MHz.

Table 1. SD DLL Div Map Register Examples
I/O Frequency Preset DIV_MAP register Divide By
Field Value
200 MHz 0

[DIV_0]

0Ch 6
1 [DIV_1] 18h 12
2 [DIV_2] 30h 24
100 MHz 0 [DIV_0] 18h 12
1 [DIV_1] 30h 24
50 MHz 0 [DIV_0] 30h 24
30 MHz 0 [DIV_0] 50h 40