WM8198
Production Data
REGISTER MAP DESCRIPTION
The following table describes the function of each of the control bits shown in Table 5.
REGISTER
BIT
NO
BIT
NAME(S)
DEFAULT
DESCRIPTION
Setup
0
EN
1
When SELPD = 1 this bit has no effect.
Register 1
When SELPD = 0 this bit controls the global power down:
0 = complete power down, 1 = fully active.
1
CDS
1
Select correlated double sampling mode: 0 = single ended mode,
1 = CDS mode.
2
3
MONO
SELPD
0
0
Mono/colour select: 0 = colour, 1 = monochrome operation.
Selective power down: 0 = no individual control,
1 = individual blocks can be disabled (controlled by SELDIS[3:0]).
5:4
PGAFS[1:0]
00
Offsets PGA output to optimise the ADC range for different polarity sensor
output signals. Zero differential PGA input signal gives:
00 = Zero output
(use for bipolar video)
01 = Zero output
10 = Full-scale positive output
(use for negative going video)
11 = Full-scale negative output
(use for positive going video)
6
7
MODE4
0
0
Required when operating in MODE4: 0 = other modes, 1 = MODE4.
PGAMODE
Selects between wide gain range PGA mode (linear in dB) and high resolution
linear PGA mode.
0 = Wide gain range PGA mode. Gain (V/V) = 416/(566 – PGA[8:0])
1 = High-resolution linear PGA mode. Gain (V/V) = 1 + PGA[8:0]x4/511
Determines the output data format.
Setup
Register 2
1
2
MUXOP
INVOP
1:0
0
00 = 8-bit multiplexed
10 = 8-bit multiplexed mode (8+8 bits)
01 = 8-bit multiplexed (8+8 bits) 11 = 4-bit multiplexed mode (4+4+4+4 bits)
Digitally inverts the polarity of output data.
0 = negative going video gives negative going output,
1 = negative-going video gives positive going output data.
3
5
VRLCEXT
0
1
When set powers down the RLCDAC, changing its output to Hi-Z, allowing
VRLC/VBIAS to be externally driven.
RLCDACRNG
Sets the output range of the RLCDAC.
0 = RLCDAC ranges from 0 to AVDD (approximately),
1 = RLCDAC ranges from 0 to VRT (approximately).
7:6
DEL[1:0]
00
Sets the output latency in ADC clock periods.
1 ADC clock period = 2 MCLK periods except in Mode 3 where 1 ADC clock
period = 3 MCLK periods.
00 = Minimum latency
01 = Delay by one ADC clock
period
10 = Delay by two ADC clock periods
11 = Delay by three ADC clock periods
Setup
Register 3
3:0
5:4
RLCV[3:0]
1111
01
Controls RLCDAC driving VRLC pin to define single ended signal reference
voltage or Reset Level Clamp voltage. See Electrical Characteristics section
for ranges.
CDSREF[1:0]
CDS mode reset timing adjust.
00 = Advance 1 MCLK period
01 = Normal
10 = Retard 1 MCLK period
11 = Retard 2 MCLK periods
7:6
CHAN[1:0]
00
Monochrome mode channel select.
00 = Red channel select
01 = Green channel select
10 = Blue channel select
11 = Reserved
Software
Reset
Any write to Software Reset causes all cells to be reset. It is recommended
that a software reset be performed after a power-up before any other register
writes.
Auto-cycle
Reset
Any write to Auto-cycle Reset causes the auto-cycle counter to reset
to RINP. This function is only required when LINEBYLINE = 1.
PD Rev 4.0 June 2004
26
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
