Xilinx RocketIO User Manual

RocketIO™ Transceiver User Guide www.xilinx.com 33
UG024 (v3.0) February 22, 2007
Primitive Attributes
R
RX_BUFFER_USE Always set to TRUE.
RX_CRC_USE,
TX_CRC_USE
TRUE/FALSE determines if CRC is used or not.
RX_DATA_WIDTH,
TX_DATA_WIDTH
Integer (1, 2, or 4). Relates to the data width of the FPGA fabric interface.
RX_DECODE_USE This determines if the 8B/10B decoding is bypassed. FALSE denotes that it
is bypassed.
RX_LOS_INVALID_INCR Power of two in a range of 1 to 128 that denotes the number of valid
characters required to “cancel out” appearance of one invalid character for
loss of sync determination.
RX_LOS_THRESHOLD Power of two in a range of 4 to 512. When divided by
RX_LOS_INVALID_INCR, denotes the number of invalid characters
required to cause FSM transition to “sync lost” state.
RX_LOSS_OF_SYNC_FSM TRUE/FALSE denotes the nature of RXLOSSOFSYNC output.
TRUE: RXLOSSOFSYNC outputs the state of the FSM bits.
See “RXLOSSOFSYNC,” page 26, for details.
SERDES_10B Denotes whether the reference clock is 1/10 or 1/20 the serial bit rate.
TRUE: 1/10
(Refer to XAPP572 when considering running in this serial
range.)
FALSE: 1/20
FALSE supports a serial bitstream range of 1.0 Gb/s to 3.125 Gb/s.
TRUE supports a range of 600 Mb/s to 1.0 Gb/s.
See “Half-Rate Clocking Scheme,” page 54.
TERMINATION_IMP Integer (50 or 75). Termination impedance of either 50Ω or 75Ω. Refers to
both the RX and TX.
TX_BUFFER_USE Always set to TRUE.
TX_CRC_FORCE_VALUE 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.
TX_DIFF_CTRL 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.
TX_PREEMPHASIS 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 3-2, page 104.
Table 1-6: RocketIO Transceiver Attributes (Continued)
Attribute Description
Product Not Recommended for New Designs

Xilinx RocketIO Specifications

General

Brand	Xilinx
Model	RocketIO
Category	Transceiver
Language	English