Prdrvoff; Empoff; Slew; Txemphlevel[3:0] - Xilinx RocketIO X User Manual

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PRDRVOFF

PRDRVOFF enables and disables the line driver. The default is 0 (Enabled). When
disabled, the output is kept at the common mode voltage. The line driver control is defined
as follows:
Table C-16:

EMPOFF

EMPOFF enables and disables the emphasis feature in the line driver. The default is 0
(Enabled). When enabled, the emphasis level is set by TXEMPHLEVEL[3:0]. The
emphasis control is defined as follows:

Table C-17: EMPOFF Definition

SLEW

SLEW sets the slew rate of the line driver. The default is primitive dependent. The slew
rate control is defined as follows:

Table C-18: SLEW Definition

TXEMPHLEVEL[3:0]

TXEMPHLEVEL[3:0] selects the transmit line driver emphasis current level (and, thus,
emphasis voltage level). The emphasis levels are defined in the
User
154
PRDRVOFF Definition
PRDRVOFF
0
1
EMPOFF
0
1
SLEW
0
1
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Appendix C: PMA Attribute Programming Bus
Line Driver
Enabled (Default)
Disabled
Emphasis
Enabled (Default)
Disabled
Slew Rate
Fast
Slow
RocketIO™ X Transceiver User Guide
RocketIO X Transceiver
UG035 (v1.5) November 22, 2004