Table 9: LCPLL Ports (cont'd)
Port Direction
Clock
Domain
Description
RCALEN In Async Reserved. This port must be set to 1’b1. Do not modify this
value.
SDMDATA[25:0] In Async Input to set the Fractional Divider. Bits [SDMWIDTH +
1:SDMWIDTH] are the integer part of the divider in two’s
complement. Bits [SDMWIDTH – 1:SDMWIDTH] set the
fractional part of the divider.
SDMTOGGLE In Async Reserved. Set to 1’b0.
Table 10: LCPLL Attributes
Attributes Type Description
BIAS_CFG0 16-bit Reserved. Use the recommended value from the Wizard.
BIAS_CFG1 16-bit Reserved. Use the recommended value from the Wizard.
BIAS_CFG2 16-bit Reserved. Use the recommended value from the Wizard.
BIAS_CFG3 16-bit Reserved. Use the recommended value from the Wizard.
BIAS_CFG4 16-bit Reserved. Use the recommended value from the Wizard.
A_CFG 16-bit Reserved. Use the recommended value from the Wizard.
CRS_CTRL_CFG0 16-bit Reserved. Use the recommended value from the Wizard.
CRS_CTRL_CFG1 16-bit Reserved. Use the recommended value from the Wizard.
DRPEN_CFG 16-bit Reserved. Use the recommended value from the Wizard.
PLL_CFG0 16-bit Reserved. Use the recommended value from the Wizard.
Bit Name Address Description
LCPLLCLKOUT_RATE [8] Sets the LCPLLCLKOUT_RATE factor either to provide full
LCPLL VCO frequency, or half of LCPLL VCO frequency at the
output:
1'b0: Half rate.
1'b1: Full rate.
PLL_CFG1
16-bit Reserved. Use the recommended value from the Wizard.
Bit Name Address Description
LCPLL_REFCLK_DIV [4:0] LCPLL reference clock divider M settings.
5'b00000: Div by 2.
5'b00001: Div by 3.
5'b00010: Div by 4.
5'b10010: Div by 1.
Other values are not valid.
PLL_CFG2
16-bit Reserved. Use the recommended value from the Wizard.
PLL_CFG3 16-bit Reserved. Use the recommended value from the Wizard.
PLL_CFG4 16-bit Reserved. Use the recommended value from the Wizard.
PLL_CFG5 16-bit Reserved. Use the recommended value from the Wizard.
PLL_CFG6 16-bit Reserved. Use the recommended value from the Wizard.
Chapter 2: Shared Features
UG581 (v1.0) January 4, 2019 www.xilinx.com
Virtex UltraScale+ GTM Transceivers 22
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