VCU_PLL_CTRL (VCU_SLCR) Register - UG1087

Zynq UltraScale+ Devices Register Reference (UG1087)

Document ID
UG1087
Release Date
2024-03-13
Revision
1.10

VCU_PLL_CTRL (VCU_SLCR) Register Description

Register NameVCU_PLL_CTRL
Offset Address0x0000000024
Absolute Address 0x00A0040024 (VCU_SLCR)
Width32
TypemixedMixed types. See bit-field details.
Reset Value0x0001510F
DescriptionPLL Basic Control

VCU_PLL_CTRL (VCU_SLCR) Register Bit-Field Summary

Field NameBitsTypeReset ValueDescription
Reserved31:27razRead as zero0x0reserved
Reserved26:18razRead as zero0x0reserved
CLKOUTDIV17:16rwNormal read/write0x1This does not change the VCO frequency, just the output frequency
Reserved15razRead as zero0x0reserved
FBDIV14:8rwNormal read/write0x51The integer portion of the feedback divider to the PLL
Reserved 7:4razRead as zero0x0reserved
BYPASS 3rwNormal read/write0x1Bypasses the PLL clock. The usable clock will be determined from the POST_SRC field. (This signal may only be toggled after 4 cycles of the old clock and 4 cycles of the new clock. This is not usually an issue, but designers must be aware.)
pctrl_por_in 2rwNormal read/write0x1Drives pctrl_por_b_in pin of PLL. An invertor is there before PLL on this bit. 1will keep in reset mode.
pss_pwr_por 1rwNormal read/write0x1Drives pss_pwr_por_b pin of PLL. An invertor is there before PLL on this bit.1will keep in reset mode.
RESET 0rwNormal read/write0x1Asserts Reset to the PLL. 1will keep PLL in reset mode.