scan921226hsmx National Semiconductor Corporation, scan921226hsmx Datasheet - Page 16

• Manufacturer Part Number: scan921226hsmx
• Description: High Temperature 20-80 Mhz 10 Bit Bus Lvds Serdes With Ieee 1149.1 Jtag And At-speed Bist
• Manufacturer: National Semiconductor Corporation

www.national.com
Application Information
USING t
The parameter t
much of the ideal bit the receiver needs to ensure correct
sampling. After determining this amount, what remains of the
ideal bit that is available for external sources of noise is
called t
RNM
DJIT
. t
AND t
RNM
RNM
includes transmitter jitter.
RNM
is calculated by first measuring how
TO VALIDATE SIGNAL QUALITY
FIGURE 19. Deterministic Jitter and Ideal Bit Position
(Continued)
FIGURE 18. Failsafe Biasing Setup
16
Please refer to Figure 19 and Figure 20 for a graphic repre-
sentation of t
nation of t
Validate BLVDS SER/DES Signal Integrity Using an Eye
Mask’.
The vertical limits of the mask are determined by the
SCAN921226H receiver input threshold of +/− 50mV.
RNM
DJIT
, please see the Application Note titled ’How to
and t
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RNM
. Also, for a more detailed expla-
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