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ADC12J1600 Datasheet(PDF) 53 Page - Texas Instruments

Part # ADC12J1600
Description  GSPS ADCs With Integrated DDC
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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ADC12J1600 Datasheet(HTML) 53 Page - Texas Instruments

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ADC12J1600, ADC12J2700
www.ti.com
SLAS969C – JANUARY 2014 – REVISED JULY 2015
7.4.5.3 PRBS Test Modes
The PRBS test modes bypass the 8B10B encoder. These test modes produce pseudo-random bit streams that
comply with the ITU-T O.150 specification. These bit streams are used with lab test equipment that can self-
synchronize to the bit pattern and therefore the initial phase of the pattern is not defined.
The sequences are defined by a recursive equation. For example, the PRBS7 sequence is defined as shown in
Equation 9.
y[n] = y[n – 6]
y[n – 7]
where
Bit n is the XOR of bit [n – 6] and bit [n – 7] which are previously transmitted bits
(9)
Table 35. PBRS Mode Equations
PRBS TEST MODE
SEQUENCE
SEQUENCE LENGTH (bits)
PRBS7
y[n] = y[n – 6]y[n – 7]
127
PRBS15
y[n] = y[n – 14]y[n – 15]
32767
PRBS23
y[n] = y[n – 18]y[n – 23]
8388607
The initial phase of the pattern is unique for each lane.
7.4.5.4 Ramp Test Mode
In the ramp test mode, the JESD204B link layer operates normally, but the transport layer is disabled and the
input from the formatter is ignored. After the ILA sequence, each lane transmits an identical octet stream that
increments from 0x00 to 0xFF and repeats.
7.4.5.5 Short and Long-Transport Test Mode
The short-transport test mode is available when the device is operated in DDC bypass mode (decimation = 1).
The short transport pattern has a length of one frame. Table 36 lists the formula followed by each sample of the
pattern.
Table 36. Short Transport Test Pattern Definition
BIT
11
10
9
8
7
6
5
4
3
2
1
0
~LID
LID
SID+1
LID is the lane ID (0 to 7) and SID is the sample number within the frame (0 to 4). The entire pattern has a length
of one frame and is listed in Table 37.
Table 37. Short Transport Test Pattern
LANE (CONVERTER ID)
SAMPLE NUMBER (SID)
0
1
2
3
4
0
0xF01
0xF02
0xF03
0xF04
0xF05
1
0xE11
0xE12
0xE13
0xE14
0xE15
2
0xD21
0xD22
0xD23
0xD24
0xD25
3
0xC31
0xC32
0xC33
0xC34
0xC35
4
0xB41
0xB42
0xB43
0xB44
0xB45
5
0xA51
0xA52
0xA53
0xA54
0xA55
6
0x961
0x962
0x963
0x964
0x965
7
0x871
0x872
0x873
0x874
0x875
Copyright © 2014–2015, Texas Instruments Incorporated
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