Rxloopfilterr[2:0]; Rxvcosw; Rxcpi; Rxvcodac - Xilinx RocketIO X User Manual

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RXLOOPFILTERR[2:0]

RXLOOPFILTERR[2:0] selects the receive PLL filter resistor setting. The default is
primitive dependent. The receiver loop filter resistor selection is as follows:

Table C-27: RXLOOPFILTERR[2:0] Definition

RXVCOSW

RXVCOSW selects source of 1.5V receiver VCO power supply. The default is primitive
dependent. The receiver VCO power supply selection is defined as follows:

Table C-28: RXVCOSW Definition

RXCPI

RXCPI sets the receiver charge pump bias current. The default is primitive dependent. The
receiver charge pump bias current is defined as follows:

Table C-29: RXCPI[1:0] Definition

RXVCODAC

RXVCODAC selects between automatic and DAC control of receiver VCO center
frequency. The default is 0 (Automatic, i.e., independent of VCODAC[5:0]). When set to
158
RXLOOPFILTERR[2:0]
000
001
010
011
100
101
110
111
RXVCOSW
0
1
RXCPI[1:0] RX Charge Pump Bias Current
00
01
10
11
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Appendix C: PMA Attribute Programming Bus
RX Filter Resistor
12 kΩ
6 kΩ
5 kΩ
4 kΩ
3 kΩ
2.25 kΩ
1.5 kΩ
0.75 kΩ
Receiver VCO Supply
Regulated (from 2.5V)
Unregulated (from 1.5V)
150 µA
300 µA
300 µA
600 µA
RocketIO™ X Transceiver User Guide
UG035 (v1.5) November 22, 2004