Xilinx RocketIO User Manual

30 www.xilinx.com RocketIO™ Transceiver User Guide
UG024 (v3.0) February 22, 2007
Chapter 1: RocketIO Transceiver Overview
R
CHAN_BOND_OFFSET Integer 0-15 that defines offset (in bytes) from channel bonding sequence for
realignment. It specifies the first elastic buffer read address that all channel-
bonded transceivers have immediately after channel bonding.
CHAN_BOND_WAIT specifies the number of bytes that the master
transceiver passes to RXDATA, starting with the channel bonding sequence,
before the transceiver executes channel bonding (alignment) across all
channel-bonded transceivers.
CHAN_BOND_OFFSET specifies the first elastic buffer read address that all
channel-bonded transceivers have immediately after channel bonding
(alignment), as a positive offset from the beginning of the matched channel
bonding sequence in each transceiver.
For optimal performance of the elastic buffer, CHAN_BOND_WAIT and
CHAN_BOND_OFFSET should be set to the same value (typically 8).
CHAN_BOND_ONE_SHOT TRUE/FALSE that controls repeated execution of channel bonding.
FALSE: Master transceiver initiates channel bonding whenever possible
(whenever channel-bonding sequence is detected in the input) as long as
input ENCHANSYNC is High and RXRESET is Low.
TRUE: Master transceiver initiates channel bonding only the first time it
is possible (channel bonding sequence is detected in input) following
negated RXRESET and asserted ENCHANSYNC. After channel-bonding
alignment is done, it does not occur again until RXRESET is asserted and
negated, or until ENCHANSYNC is negated and reasserted.
Always set Slave transceivers CHAN_BOND_ONE_SHOT to FALSE.
CHAN_BOND_SEQ_*_* 11-bit vectors that define the channel bonding sequence. The usage of these
vectors also depends on CHAN_BOND_SEQ_LEN and
CHAN_BOND_SEQ_2_USE. See “Receiving Vitesse Channel Bonding
Sequence,” page 65, for format.
CHAN_BOND_SEQ_2_USE Controls use of second channel bonding sequence.
FALSE: Channel bonding uses only one channel bonding sequence
defined by CHAN_BOND_SEQ_1_1...4.
TRUE: Channel bonding uses two channel bonding sequences defined
by:
CHAN_BOND_SEQ_1_1...4 and
CHAN_BOND_SEQ_2_1...4
as further constrained by CHAN_BOND_SEQ_LEN.
CHAN_BOND_SEQ_LEN Integer 1-4 defines length in bytes of channel bonding sequence. This
defines the length of the sequence the transceiver matches to detect
opportunities for channel bonding.
CHAN_BOND_WAIT Integer 1-15 that defines the length of wait (in bytes) after seeing channel
bonding sequence before executing channel bonding.
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