Xilinx Virtex-5 RocketIO GTP User Manual

118 www.xilinx.com Virtex-5 RocketIO GTP Transceiver User Guide
UG196 (v1.3) May 25, 2007
Chapter 6: GTP Transmitter (TX)
R
Figure 6-16 illustrates the rise times associated with the receiver present and receiver
absent conditions, along with the detection threshold.
When the PHY has completed the receiver detect sequence, it asserts PHYSTATUS for one
clock and drives the RXSTATUS signals to the appropriate code. After the receiver
detection is completed (as signaled by the assertion of PHYSTATUS), TXDETECTRX must
be deasserted. Figure 6-17 shows this process.
Figure 6-16: Receive Detection Thresholds
Figure 6-17: Receiver Detect Waveforms
UG196_c6_16_071006
V
DD
V
DD
-V
SWING
/2
τ ≅ 2R
TERM
C
AC
> 6000 ns
τ ≅ R
TERM
C
CH
< 180 ns
τ ≅ 1/2R
TERM
C
CH
Receiver Absent
Receiver Present
Time
rcvDly
rcvRef
TXUSRCLK2
RXUSRCLK2
TXDETECTRX
PHYSTATUS
RXPOWERDOWN[1:0]
TXPOWERDOWN[1:0]
RXSTATUS[2:0] 000b Status
10b
UG196_c6_17_080806

Xilinx Virtex-5 RocketIO GTP Specifications

General

Brand	Xilinx
Model	Virtex-5 RocketIO GTP
Category	Transceiver
Language	English