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TX OOB/Beacon Signaling
Overview
Each GTP transceiver provides support for generating the Out-of-Band (OOB) sequences
described in the Serial ATA (SATA) and beaconing for PCI Express specifications. See
Appendix B, "OOB/Beacon Signaling,"
used in these protocols.
GTP_DUAL support for SATA OOB signaling consists of the analog circuitry required to
encode the OOB signal state and state machines to format bursts of OOB signals for SATA
COM sequences (COMRESET, COMWAKE, and COMINIT). Each GTP transceiver also
supports SATA autonegotiation by allowing the timing of the COM sequences to be
changed based on the divider settings used for the TX line rate.
GTP_DUAL support for PCI Express OOB signaling-based beacons consists of support for
generating OOB states using interface signals defined in the PHY Interface for the PCI
Express (PIPE) Specification. The format of the beacon sequence is controlled by the FPGA
logic.
Ports and Attributes
Table 6-20
Table 6-20: TX OOB/Beacon Signaling Ports
Port
RXSTATUS0[2:0]
RXSTATUS1[2:0]
TXCOMSTART0
TXCOMSTART1
TXCOMTYPE0
TXCOMTYPE1
TXELECIDLE0
TXELECIDLE1
TXPOWERDOWN0[1:0]
TXPOWERDOWN1[1:0]
Virtex-5 RocketIO GTP Transceiver User Guide
UG196 (v1.3) May 25, 2007
describes the ports that control OOB/beacon signaling.
Dir
Domain
The decoding of RXSTATUS[2:0] depends on the setting of
RX_STATUS_FMT:
• When RX_STATUS_FMT = PCIE:
RXSTATUS is not used for PCIe TXELECIDLE
Out
RXUSRCLK2
• When RX_STATUS_FMT = SATA:
RXSTATUS[0]: TXCOMSTART operation complete
RXSTATUS[1]: COMWAKE signal received
RXSTATUS[2]: COMRESET/COMINIT signal received
Initiates the transmission of the COM* sequence selected by
In
TXUSRCLK2
TXCOMTYPE (SATA only).
Selects the type of COM signal to send (SATA only):
In
TXUSRCLK2
0: COMRESET/COMINIT
1: COMWAKE
When in the P2 power state, this signal controls whether an electrical
In
TXUSRCLK2
idle or a beacon indication is driven out onto the TX pair.
Powers down TX lanes. The GTP_DUAL tile must be in the P2 power
In
Async
state (TXPOWERDOWN = 11) to generate beacon signaling.
www.xilinx.com
TX OOB/Beacon Signaling
for an overview of OOB signaling and how it is
Description
119
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