DS90UH940-Q1 Datasheet, PDF (36/87 Pages) Texas Instruments – FPD-Link III to CSI-2 Deserializer

DS90UH940-Q1
SNLS478A – NOVEMBER 2014 – REVISED JANUARY 2016
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Normal
Step 1: DES in BIST
BIST
Wait
Step 2: Wait, SER in BIST
BIST
start
Step 3: DES in Normal
Mode - check PASS
BIST
stop
Step 4: DES/SER in Normal
Figure 26. BIST Mode Flow Diagram
8.3.14.2 Forward Channel and Back Channel Error Checking
The Deserializer, on locking to the serial stream, compares the recovered serial stream with all-zeroes and
records any errors in status registers. Errors are also dynamically reported on the PASS pin of the deserializer.
Forward channel errors may also be read from register 0x25 (Table 12).
The back-channel data is checked for CRC errors once the serializer locks onto the back-channel serial stream,
as indicated by link detect status (register bit 0x0C[0] - Table 12). CRC errors are recorded in an 8-bit register in
the serializer. The register is cleared when the serializer enters the BIST mode. As soon as the serializer enters
BIST mode, the functional mode CRC register starts recording any back channel CRC errors. The BIST mode
CRC error register is active in BIST mode only and keeps the record of the last BIST run until cleared or the
serializer enters BIST mode again.
BISTEN
(DES)
CLK[2:1]
D[7:0]
7 bits/frame
DATA
(internal)
PASS
Prior Result
DATA
X
(internal)
PASS
Prior Result
Normal
SSO
X = bit error(s)
X
X
BIST Test
BIST Duration
BIST Waveforms
PASS
FAIL
BIST
Result
Held
Normal
8.3.15 Internal Pattern Generation
The deserializer supports the internal pattern generation feature. It allows basic testing and debugging of an
integrated panel. The test patterns are simple and repetitive and allow for a quick visual verification of panel
operation. As long as the device is not in power down mode, the test pattern will be displayed even if no parallel
input is applied. If no PCLK is received, the test pattern can be configured to use a programmed oscillator
frequency. For detailed information, refer to Application Note AN-2198 (SNLA132).
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