ELXLEVK01 National Semiconductor, ELXLEVK01 Datasheet - Page 17

• Manufacturer Part Number: ELXLEVK01
• Description: KIT EVAL EASYLINK DS32ELX0421
• Manufacturer: National Semiconductor

Specifications of ELXLEVK01

• Main Purpose: Interface, LVDS
• Embedded: No
• Utilized Ic / Part: DS32ELX0421
• Primary Attributes: 6.25 Gbps, Serializer with DDR LVDS Parallel 5-Bit LVDS Interface
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Secondary Attributes: -
• Lead Free Status / Rohs Status: Supplier Unconfirmed

PROPAGATION DELAY
Once the serializer is locked, the amount of time it takes for
a bit to travel into the device through the DDR LVDS inputs
and out through the CML serial output is defined to be the
propagation delay. The propagation delay through the
DS32EL0421/DS32ELX0421 due to the analog circuitry is
considered negligible compared to the time delay caused by
the digital components. The information presented in this sec-
tion allows system designers to predict the propagation delay
through the device in terms of clock cycles which are propor-
tional to the high speed serial line rate.
FIGURE 11. Serializer Propagation Delay
17
Each clock cycle shown in
of the high speed serial bit rate. For example, at a serial line
rate of 3.125 Gbps the clock frequency of each delay cycle
would be 156.25 MHz. Note, this is not the same frequency
as the LVDS inputs, which would be 312.5 MHz (625 Mbps)
for a serial line rate of 3.125 Gbps. Dashed lines in
11
and therefore add no more time to the total propagation delay.
indicate that the feature is disabled by default in that mode
Figure 11
is defined to be 1/20th
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