Txvcogain; Txvsel[1:0]; Txreg[1:0]; Txdownlevel[3:0] - Xilinx RocketIO X User Manual

Register Definition

TXVCOGAIN

TXVCOGAIN selects between low and high gain of the transmit VCO. The default is 1
(High). The transmit VCO gain control is defined as follows:

Table C-13: TXVCOGAIN Definition

TXVSEL[1:0]

TXVSEL[1:0] selects the transmit regulator voltage. The default is 00 (Nominal). The
regulator voltage selection is defined as follows:

Table C-14: TXVSEL[1:0] Definition

TXREG[1:0]

TXREG[1:0] selects the transmit regulator output current. The default is primitive
dependent. The transmit regulator current is defined as follows:

Table C-15: TXREG[1:0] Definition

TXDOWNLEVEL[3:0]

TXDOWNLEVEL[3:0] selects the transmit line driver current (and, thus, output voltage
swing). The output swing is defined in the
RocketIO™ X Transceiver User Guide
UG035 (v1.5) November 22, 2004
TXVCOGAIN
0
1
TXVSEL[1:0]
00
01
10
11
TXREG[1:0]
00
01
10
11
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TX VCO Gain
Low
High (Default)
TX Regulator
Nominal (Default)
H Vdd
IGH
Low Vdd
Voltage Divider
TX Regulator Current
15 mA
30 mA
45 mA
60 mA
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