Xilinx Virtex-5 RocketIO GTP User Manual

134 www.xilinx.com Virtex-5 RocketIO GTP Transceiver User Guide
UG196 (v1.3) May 25, 2007
Chapter 7: GTP Receiver (RX)
R
Example
Table 7-7 shows some example settings for the squelch clock divider.
Table 7-8 shows all the minimum and maximum values defined in SATA for burst and idle
lengths, along with example calculations based on the squelch clock frequencies computed
in Table 7-7.
Table 7-7: Example Clock Generation Settings for SATA
Parameter Example 1 Example 2 Example 3 Example 4 Example 5 Example 6
CLKIN (MHz) 25 75 100 150 250 300
OOB_CLK_DIVIDER 1 2 4 6 10 14
Squelch Clock (MHz) 25 37.5 25 25 25 21.42857143
Effective Sample Period (ns) 20 13.33333333 20 20 20 23.33333333
Table 7-8: Example SATA Attribute Settings
Parameter ns cycles cycles cycles cycles cycles cycles
Shortest Burst width that must be rejected 55 2.8 4.1 2.8 2.8 2.8 2.357142857
MinBurstWidth 46444 3
Shortest Burst width that must be accepted 101 5.1 7.6 5.1 5.1 5.1 4.341428571
Nominal Burst length 107 5.3 8.0 5.3 5.3 5.3 4.572857143
Longest Burst width that must be accepted 112 5.6 8.4 5.6 5.6 5.6 4.8
MaxBurstWidth 7 11 7 7 7 6
Longest Burst width that must be rejected 175 8.8 13.1 8.8 8.8 8.8 7.5
Shortest idle width that must be rejected for
COMINIT
175 8.8 13.1 8.8 8.8 8.8 7.5
MinInitWidth 12 18 12 12 12 10
Shortest idle width that must be accepted for
COMINIT
304 15.2 22.8 15.2 15.2 15.2 13.02857143
Nominal idle width for COMINIT 320 16.0 24.0 16.0 16.0 16.0 13.71428571
Longest idle width that must be accepted for
COMINIT
336 16.8 25.2 16.8 16.8 16.8 14.4
MaxInitWidth 22 32 22 22 22 18
Longest idle width that must be rejected for
COMINIT
525 26.3 39.4 26.3 26.3 26.3 22.5
Shortest idle width that must be rejected for
COMWAKE
55 2.8 4.1 2.8 2.8 2.8 2.357142857
MinWakeWidth 46444 3
Shortest idle width that must be accepted for
COMWAKE
101.3 5.1 7.6 5.1 5.1 5.1 4.341428571
Nominal idle width for COMWAKE 106.7 5.3 8.0 5.3 5.3 5.3 4.572857143

Xilinx Virtex-5 RocketIO GTP Specifications

General

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