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WM8235 Datasheet(PDF) 53 Page - Cirrus Logic

Part # WM8235
Description  210MSPS 9-Channel AFE with Sensor
PDF  154 Pages
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Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8235 Datasheet(HTML) 53 Page - Cirrus Logic

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WM8235
Rev 4.6
53
TEST PATTERN GENERATOR
WM8235 has test pattern generator which can be used for interface verification between AFE data
output and back-end devices without sensor signal input. This function can be presented in several
different patterns by PGPAT[1:0] and PGMARCH registers as shown below. The PGLEVEL,
PGWIDTH1 and PGWIDTH2 are the parameter to define the pattern level and width. The PGLEVEL
register has 16bit length, PGWIDTH1 and PGWIDTH2 has 8bit length.
Note that test pattern generator is required TGSYNC input. (i.e. this can be used under TG slave
mode operation only.)
PGEN (register)
PGPAT=00
(Fixed Pattern)
0
0
d
2d
0
0
0
d
0
d
0
d
0
nd
0
0
0
d
md
0
d
B A
A
B
A
B
A
A
0
TGSYNC (input)
A
PGPAT=01
(Vertical RAMP)
PGPAT=10
(Horizontal RAMP)
PGPAT=11
(Patch)
d=PGLEVEL
A=PGWIDTH1
B=PGWIDTH2
65535
0
Return to 0 at 65535
Figure 35 Test Pattern Output Data Formats
A
d
d
d
d
d
d
d
d
A
A
A
A
A
A
A
B
A
B
A
B
A
B
A
B
B
A
d
d
d
d
d
d
0
0
A
A
A
A
A
A
A
A
0
d
2d
3d
4d
5d
6d
7d
A
A
A
A
A
A
A
0
d
2d
3d
4d
5d
6d
A
A
A
A
A
A
A
PGINV=0
B
A
~d
~d
~d
~d
~d
~d
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
~0
~d ~2d ~3d ~4d ~5d ~6d ~7d
~0
~d
~2d
~3d
~4d
~5d
~6d
TGSYNC
TGSYNC
TGSYNC
~0
~0
PGINV=1
PGPAT=01
PGPAT=10
PGPAT=11
d=PGLEVEL
A=PGWIDTH1
B=PGWIDTH2
(Vertical RAMP)
(Horizontal RAMP)
(Patch)
Figure 36 Test Pattern Output image



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