Rxcpgain; Rxfltcpt[4:0]; Vselafe[1:0]; Rxfei[1:0] - Xilinx RocketIO X User Manual

Register Definition

RXCPGAIN

RXCPGAIN selects between low and high gain of the receiver charge pump. The default
is 1 (High). The receiver charge pump gain control is defined as follows:
Table C-35:

RXFLTCPT[4:0]

RXFLTCPT[4:0] controls the phase adjustment of the receiver sample clock relative to the
data. RXFLTCPT[4] is the sign and RXFLTCPT[3:0] are binary weighted magnitude. The
magnitude is relative to the data unit interval (UI), with a range of ~±0.3UI.
Note:

VSELAFE[1:0]

VSELAFE[1:0] sets the receiver analog front end (AFE) common mode input voltage. The
default is primitive dependent. The receiver AFE common mode voltage is defined as
follows:

Table C-36: VSELAFE[1:0] Definition

RXFEI[1:0]

RXFEI[1:0] sets the receiver front end/equalizer current. The default is 11 (24 mA). The
receiver front-end current is defined as follows:

Table C-37: RXFEI[1:0] Definition

RocketIO™ X Transceiver User Guide
UG035 (v1.5) November 22, 2004
RXCPGAIN Definition
RXCPGAIN
0
1
Need to determine early/late relationship of the sign.
VSELAFE[1:0] RX AFE Common Mode Input
00
01
10
11
RXFEI[1:0]
00
01
10
11
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RX Charge Pump Gain
Low
High (Default)
720 mV
840 mV
960 mV
1080 mV
RX Front End Current
6 mA
12 mA
18 mA
24 mA (Default)
R
161