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Chapter 7: GTP Receiver (RX)
To set up a daisy chain, first connect the GTP transceivers using RXCHBONDO and
RXCHBONDI to create a path from the RXCHBONDI port of each slave to the
RXCHBONDO port of the master. Use the following steps to set the
CHAN_BOND_LEVEL for the GTP transceivers in the chain:
1.
2.
3.
Setting the Channel Bonding Sequence
The channel bonding sequence is programmed in the same way as the clock correction
sequence. CHAN_BOND_SEQ_LEN sets the length of the sequence from one to four
subsequences. CHAN_BOND_SEQ_1_* sets the values of the sequence. If
CHAN_BOND_SEQ_2_USE is TRUE, CHAN_BOND_SEQ_2_* sets the values for the
alternate second sequence.
The number of active bits in each subsequence depends on INTDATAWIDTH (see
Chapter 5, "Tile
Correction," page
As with clock correction sequences, channel bonding sequences can have don't care
subsequences. CHAN_BOND_SEQ_1_ENABLE and CHAN_BOND_SEQ_2_ENABLE set
these bytes.
bonding subsequences.
180
Set the CHAN_BOND_LEVEL of the master to 7.
Set the CHAN_BOND_LEVEL of each slave to the CHAN_BOND_LEVEL of the GTP
transceiver driving the slave's RXCHBONDI port minus 1.
Find the slave with the lowest level. Subtract this level from the
CHAN_BOND_LEVEL of all of the GTP transceivers so that the lowest slave has
level 0 and the master has the minimum level required to service all the slaves.
Features") and RX_DECODE_SEQ_MATCH (see
168).
Figure 7-31
CHAN BOND_SEQ_x_y
Figure 7-31: Channel Bonding Sequence Settings
Figure 7-32
shows the mapping of the enable attributes for the channel
CHAN_BOND_SEQ_x_4
CHAN_BOND_SEQ_x_3
CHAN_BOND_SEQ_x_ENABLE
Figure 7-32: Channel Bonding Sequence Mapping
www.xilinx.com
shows how the subsequence bits are mapped.
9
8
7:0
8-Bit Channel Bonding Sequence
1 = Sequence is a K Character
0 = Sequence is Regular Character
1 = Sequence Uses Inverted Disparity
0 = Sequence Uses Regular Disparity
CHAN_BOND_SEQ_x_2
4
3
2
1
Virtex-5 RocketIO GTP Transceiver User Guide
R
"Configurable Clock
UG196_c7_28_092606
CHAN_BOND_SEQ_x_1
UG196_c7_29_092606
UG196 (v1.3) May 25, 2007
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