Rxdccouple; Rxpd; Txpd - Xilinx Virtex-4 RocketIO User Manual

Chapter 4: PMA Analog Design Considerations
Table 4-9: PMA Power Control Description
Table 4-10
one of the listed attributes is asserted TRUE, the indicated TX PMA block(s) are powered
down.
Table 4-10: Power-Down of TX PMA Blocks

RXDCCOUPLE

The attribute RXDCCOUPLE determines internal AC coupling. If set to TRUE, the internal
AC coupling is bypassed. If set to FALSE, the internal AC coupling is enabled. The
different coupling options are shown in
Considerations."

RXPD

This attribute shuts off the clocks to the receiver to save power. This does not affect the
PLL.

TXPD

This attribute shuts off the clocks to the transmitter to save power, This does not affect the
PLL.
152
TXPD
TRUE
FALSE
summarizes the attributes that power down the various TX PMA blocks. When
Attribute
TX Shared PLL
TXABREFCLKPD
TXAPD
TXPD (A side)
TXPD (B side)
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Function
Powerdown the transmitter.
Normal transmitter operation.
TX PMA Block
TX Data Path (MGTA) TX Data Path (MGTB)
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Chapter 6, "Analog and Board Design
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Virtex-4 RocketIO MGT User Guide
UG076 (v4.1) November 2, 2008
R