Iboost; Txcpi; Txvcodac; Table C-10: Iboost Definition - Xilinx RocketIO X User Manual

R
Table C-9: TXLOOPFILTERR[1:0] Definition (Continued)

IBOOST

IBOOST selects between nominal and increased bias current in all regulators. The default
is 0 (Nominal). The current is defined as follows:

Table C-10: IBOOST Definition

TXCPI

TXCPI sets the transmit charge pump bias current. The default is primitive dependent. The
transmit charge pump bias current is defined as follows:
Table C-11:

TXVCODAC

TXVCODAC selects between automatic and DAC control of transmit VCO center
frequency. The default is 1 (Automatic, i.e., independent of VCODAC[5:0]). When set to
DAC mode, the center frequency is controlled by the value of VCODAC[5:0]. The transmit
center frequency control is defined as follows:

Table C-12: TXVCODAC Definition

152
TXLOOPFILTERR[1:0]
10
11
IBOOST
0
1
TXCPI Definition
TXCPI TX Charge Pump Bias Current
0
1
TXVCODAC
0
1
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Appendix C: PMA Attribute Programming Bus
TX Filter Resistor
4 kΩ
3 kΩ
Regulator Bias Current
Nominal
Nominal + 37.5µA
150 µA
300 µA
TX VCO Center Frequency
DAC Controlled
Automatic (Default)
RocketIO™ X Transceiver User Guide
UG035 (v1.5) November 22, 2004