Ports And Attributes - Xilinx Virtex-5 RocketIO GTP User Manual

Chapter 7: GTP Receiver (RX)

Ports and Attributes

Table 7-32
Table 7-32: Channel Bonding Ports
Port
INTDATAWIDTH
RXCHANBONDSEQ0
RXCHANBONDSEQ1
RXCHANISALIGNED0
RXCHANISALIGNED1
RXCHANREALIGN0
RXCHANREALIGN1
RXCHBONDI0[2:0]
RXCHBONDI1[2:0]
RXCHBONDO0[2:0]
RXCHBONDO1[2:0]
RXENCHANSYNC0
RXENCHANSYNC1
Notes:
1. 10-bit internal data width is necessary when the RX buffer is bypassed or the PRBS generation/detection is used or both.
Table 7-33
Table 7-33: Channel Bonding Attributes
Attribute
CHAN_BOND_1_MAX_SKEW_0
CHAN_BOND_1_MAX_SKEW_1
CHAN_BOND_2_MAX_SKEW_0
CHAN_BOND_2_MAX_SKEW_1
176
defines the channel bonding ports.
Clock
Dir
Domain
Specifies the bit width for the TX and RX internal datapaths. This port
controls both transceivers on the tile.
In Async
0: 8-bit width
1: 10-bit width
Goes High when RXDATA contains the start of a channel bonding
Out RXUSRCLK2
sequence.
FPGA signal from the elastic buffer. Stays High to indicate that the
channel is properly aligned with the master transceiver according to
Out RXUSRCLK2 observed channel bonding sequences in the data stream. Goes Low if
an unaligned channel bonding sequence is detected, indicating that
channel alignment was lost.
FPGA signal from the elastic buffer. Held High for at least one cycle
Out RXUSRCLK2 when the receiver has changed the alignment between this transceiver
and the master.
FPGA channel bonding control. Used only by slaves. Driven from
In RXUSRCLK another transceiver's RXCHBONDO port that is the master in this
configuration.
FPGA channel bonding control. Used by the master and slaves to pass
Out RXUSRCLK channel bonding and clock correction control to other transceivers'
RXCHBONDI ports.
Enable channel bonding (from FPGA to the master). Tie this port High
In RXUSRCLK2
for slaves.
defines the channel bonding attributes.
Control the number of USRCLK cycles that the master waits before ordering the
slaves to execute channel bonding. This attribute determines the maximum
skew that can be handled by channel bonding. It must always be less than the
minimum distance (in bytes or 10-bit codes) between channel bonding
sequences.
Valid values range from 1 to 14.
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Description
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Description
Virtex-5 RocketIO GTP Transceiver User Guide
UG196 (v1.3) May 25, 2007
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