DS90UR907Q-Q1 Datasheet, PDF (20/35 Pages) Texas Instruments – 24-Bit Color FPD-Link to FPD-Link II Converter

DS90UR907Q-Q1
SNLS316G – SEPTEMBER 2009 – REVISED DECEMBER 2015
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Programming (continued)
BER Calculations
It is possible to calculate the approximate Bit Error Rate (BER). The following is required:
• Pixel Clock Frequency (MHz)
• BIST Duration (seconds)
• BIST test Result (PASS)
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 65-MHz RxCLKIN, a 10 minute (600 second) test, and a PASS, the BERT is ≤ 1.07 × 10E-12
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.
BISTEN
(DS90UR907Q)
BISTEN
(Deserializer)
TxCLKOUT
(Diff.)
TxOUT[3:0]
(Diff.)
DATA
(internal)
PASS
Prior Result
DATA
(internal)
PASS
Prior Result
Normal
PRBS
X = bit error(s)
X
X
X
BIST Test
BIST Duration
Figure 20. BIST Waveforms
PASS
FAIL
BIST
Result
Held
Normal
7.5.3 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 configuration by registers; this will override the control/strap pins. Multiple devices
may share the serial control bus because multiple addresses are supported. See Figure 21.
The serial bus is comprised of three pins. The SCL is a Serial Bus Clock Input. The SDA is the Serial Bus Data
Input / Output signal. Both SCL and SDA signals require an external pullup resistor to V_DDIO. For most
applications a 4.7-k pullup resistor to V_DDIO may be used. The resistor value may be adjusted for capacitive
loading and data rate requirements. The signals are either pulled High, or driven Low.
20
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