Table of Contents
Advertisement
R
GTP Reset When the GTPRESET Port is Asserted
Figure 5-8
a pulse on GTPRESET. GTPRESET acts as an asynchronous reset signal.
The following GTP_DUAL sections are affected by the GTPRESET sequence:
•
•
•
•
•
GTP Component-Level Resets
Component resets are primarily used for special cases. These resets are needed when only
the reset of a specific GTP_DUAL subsection is required.
overview of component level resets.
All component resets are asynchronous with the exception of PRBSCNTRESET, which is
synchronous to RXUSRCLK2 and is effective only on its rising edge.
Link Idle Reset Support
During operation, an electrical idle condition can occur on the GTP receiver, causing
RXELECIDLE to be driven High. The following events can cause an RX electrical idle
condition:
•
•
•
During an electrical idle condition the Clock Data Recovery (CDR) circuit in the receiver
can lose lock. To restart the CDR after an electrical idle condition, RXELECIDLERESET and
RXENELCIDLERESETB must be asserted.
describes the RXELECIDLERESET, RXENELECIDLERESETB, and the CDR circuit in more
detail.
Virtex-5 RocketIO GTP Transceiver User Guide
UG196 (v1.3) May 25, 2007
is similar to
Figure
GTPRESET
Internal TXRESET
Internal RXRESET
Internal RXBUFRESET
Figure 5-8: Reset Sequence Triggered by the GTPRESET Pulse
Shared PMA PLL
GTP0 transmit section (PMA and PCS)
GTP0 receive section (PMA and PCS)
GTP1 transmit section (PMA and PCS)
GTP1 receive section (PMA and PCS)
An open RXP/RXN differential input pair
A transmitter on the other side of the communication link powers down
An OOB/beacon signaling sequence
www.xilinx.com
5-7, showing the full reset sequence occurring in response to
Table 5-7
describes the component level resets.
"RX Clock Data Recovery (CDR)," page 136
~160 μs
UG196_c5_08_100606
Table 5-6, page 73
provides an
Reset
75
Advertisement
Table of Contents
