Modifiable Primitives - Xilinx RocketIO User Manual

Modifiable Primitives

Table 3-2: RocketIO Transceiver Attributes (Continued)
Attribute
RX_LOSS_OF_SYNC_FSM
SERDES_10B
TERMINATION_IMP
TX_BUFFER_USE
TX_CRC_FORCE_VALUE
TX_DIFF_CTRL
TX_PREEMPHASIS
Notes:
1. Will be available in ISE 5.1.
Modifiable Primitives
As shown in
primitive. These attributes help to define the protocol used by the primitive. Only the
GT_CUSTOM primitive allows the user to modify all of the attributes to a protocol not
supported by another transceiver primitive. This allows for complete flexibility. The other
primitives allow modification of the analog attributes of the serial data lines and several
channel-bonding values.
Table 3-3: Default Attribute Values: GT_AURORA, GT_CUSTOM, GT_ETHERNET
Attribute
ALIGN_COMMA_MSB
CHAN_BOND_LIMIT
CHAN_BOND_MODE
CHAN_BOND_OFFSET
CHAN_BOND_ONE_SHOT
CHAN_BOND_SEQ_1_1
CHAN_BOND_SEQ_1_2
UG024 (v1.5) October 16, 2002
RocketIO™ Transceiver User Guide
TRUE/FALSE denotes the nature of RXLOSSOFSYNC output.
TRUE: RXLOSSOFSYNC outputs the state of the FSM bit.
See RXLOSSOFSYNC, page
Denotes whether the reference clock runs at 1/20 or 1/10 the serial bit rate.
TRUE denotes 1/10 and FALSE denotes 1/20. FALSE supports a serial
bitstream range of 800 Mb/s to 3.125 Gb/s. TRUE supports a range of
622 Mb/s to 1.0 Gb/s. See
Integer (50 or 75). Termination impedance of either 50Ω or 75Ω. Refers to
both the RX and TX.
Always set to TRUE.
8-bit vector. Value to corrupt TX CRC computation when input
TXFORCECRCERR is high. This value is XORed with the correctly
computed CRC value, corrupting the CRC if TX_CRC_FORCE_VALUE is
nonzero. This can be used to test CRC error detection in the receiver
downstream.
An integer value (400, 500, 600, 700, or 800) representing 400 mV, 500 mV,
600 mV, 700 mV, or 800 mV of voltage difference between the differential
lines. Twice this value is the peak-peak voltage.
An integer value (0-3) that sets the output driver pre-emphasis to improve
output waveform shaping for various load conditions. Larger value denotes
stronger pre-emphasis. See pre-emphasis values in
Table 3-3 and Table 3-4, only certain attributes are modifiable for any
Default
GT_AURORA
FALSE
16
(2)
OFF
8
(2)
FALSE
00101111100
00000000000
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Description
26, for details.
Half-Rate Clocking Scheme, page
Default
(1)
GT_CUSTOM
FALSE
16
OFF
8
FALSE
00000000000
00000000000
R
52.
Table 4-2, page 84.
Default
GT_ETHERNET
FALSE
1
OFF
0
TRUE
00000000000
00000000000
33