DS90UR907QSQX/NOPB National Semiconductor, DS90UR907QSQX/NOPB Datasheet - Page 18

• Manufacturer Part Number: DS90UR907QSQX/NOPB
• Description: IC SERIALIZER 5-65MHZ 24B 36LLP
• Manufacturer: National Semiconductor

Specifications of DS90UR907QSQX/NOPB

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

www.national.com
Optional Serial Bus Control
The DS90UR907Q may be configured by the use of a serial
control bus that is I2C protocol compatible. By default, the I2C
reg_0x00'h is set to 00'h and all configuration is set by control/
strap pins. A write of 01'h to reg_0x00'h will enable/allow con-
figuration by registers; this will override the control/strap pins.
Multiple devices may share the serial control bus since mul-
tiple addresses are supported. See
The serial bus is comprised of three pins. The SCL is a Serial
Bus Clock Input. The SDA is the Serial Bus Data Input / Out-
put signal. Both SCL and SDA signals require an external pull
up resistor to V
sistor to V
adjusted for capacitive loading and data rate requirements.
The signals are either pulled High, or driven Low.
FIGURE 19. BIST Mode Flow Diagram
DDIO
DDIO
may be used. The resistor value may be
. For most applications a 4.7 k pull up re-
Figure
30105043
21.
FIGURE 20. BIST Waveforms
18
BER Calculations
It is possible to calculate the approximate Bit Error Rate
(BER). The following is required:
•
•
•
The BER is less than or equal to one over the product of 24
times the RxCLKIN rate times the test duration. If we assume
a 65MHz RxCLKIN, a 10 minute (600 second) test, and a
PASS, the BERT is
The BIST mode runs a check on the data payload bits. The
LOCK pin also provides a link status. It the recovery of the C0
and C1 bits does not reconstruct the expected clock signal,
the LOCK pin will switch Low. The combination of the LOCK
and At-Speed BIST PASS pin provides a powerful tool for
system evaluation and performance monitoring.
Pixel Clock Frequency (MHz)
BIST Duration (seconds)
BIST test Result (PASS)
FIGURE 21. Serial Control Bus Connection
≤
1.07 X 10E-12
30105064
30105041