ETC CH7004C-T

CH7004C
CHRONTEL
Digital PC to TV Encoder with MacrovisionTM
Features
General Description
TM
• Supports Macrovision 7.X anti-copy protection
• Pin and function compatible with CH7003
• Universal digital interface accepts YCrCb (CCIR601
or 656) or RGB (15, 16 or 24-bit) video data in both
non-interlaced and interlaced formats
• True Scale TM rendering engine supports undescan
operations for various graphics resolutions† ¥
• Enhanced text sharpness and adaptive flicker removal
with up to 5-lines of filtering†
• Enhanced dot crawl control and area reduction
• Fully programmable through I2C port
• Supports NTSC, NTSC-EIA (Japan), and PAL (B, D,
G, H, I, M and N) TV formats
• Provides Composite, S-Video and SCART outputs
• Auto-detection of TV presence
• Supports VBI pass-through
Chrontel’s CH7004 digital PC to TV encoder is a standalone integrated circuit which provides a PC 99 compliant
solution for TV output. It provides a universal digital input
port to accept a pixel data stream from a compatible VGA
controller (or equivalent) and converts this directly into
NTSC or PAL TV format.
This circuit integrates a digital NTSC/PAL encoder with
9-bit DAC interface, and new adaptive flicker filter, and
high accuracy low-jitter phase locked loop to create
outstanding quality video. Through its TrueScaleTM
scaling and de-flickering engine, the CH7004 supports full
vertical and horizontal underscan capability and operates
in 5 different resolutions including 640x480 and 800x600.
A new universal digital interface along with full
programmability make the CH7004 ideal for system-level
PC solutions. All features are software programmable
through a standard I2C port, to enable a complete PC
solution using a TV as the primary display.
• Programmable power management
• 9-bit video DAC outputs
• Complete Windows and DOS driver software
• Offered in 44-pin PLCC, 44-pin TQFP, or 100-pin
PQFP package options
• 4 Programmable GPIO pins (only with 100-pin PQFP)
† Patent number 5,781,241
¥ Patent number 5,914,753
LINE
MEMORY
YUV-RGB CONVERTER
RGB-YUV
CONVERTER
TRUE SCALE
SCALING & DEFLICKERING
ENGINE
DIGITAL
D[15:0]
PIXEL DATA
INPUT
NTSC/PAL
ENCODER
& FILTERS
INTERFACE
Y/R
TRIPLE
DAC
C/G
CVBS/B
RSET
SYSTEM CLOCK
I2C REGISTER & CONTROL
BLOCK
PLL
SC
XCLK
SD
ADDR
TIMING & SYNC GENERATOR
H
V
XI XO/FIN CSYNC P-OUT BCO
Figure 1: Functional Block Diagram
201-0000-024 Rev 2.1, 8/2/99
1
D[2]
D[1]
D[0]
V
H
XCLK
DVDD
P-OUT
DGND
BCO
AGND
5
4
3
2
1
44
43
42
41
40
CH7004C
6
CHRONTEL
D[3]
7
39
XO/FIN
D[4]
8
38
XI
D[5]
9
37
AVDD
D[6]
10
36
DVDD
DVDD
11
35
ADDR
D[7]
12
34
DGND
D[8]
13
33
SC
DGND]
14
32
SD
D[9]
15
31
VDD
D[10]
16
30
RSET
D[11]
17
29
GND
18
19
20
21
22
23
24
25
26
27
28
D[12]
D[13]
D[14]
D[15]
DVDD
CSYNC
DGND
GND
CVBS
C
Y
CHRONTEL
CH7004
Figure 2: 44-Pin PLCC
2
201-0000-024 Rev 2.1, 8/2/99
D[2]
D[1]
D[0]
V
H
XCLK
DVDD
P-OUT
DGND
BCO
AGND
43
42
41
40
39
38
37
36
35
34
CH7004C
44
CHRONTEL
D[3]
1
33
XO/FIN
D[4]
2
32
XI
D[5]
3
31
AVDD
D[6]
4
30
DVDD
DVDD
5
29
ADDR
D[7]
6
28
DGND
D[8]
7
27
SC
DGND]
8
26
SD
D[9]
9
25
VDD
D[10]
10
24
RSET
D[11]
11
23
GND
14
15
16
17
18
19
20
21
22
D[15]
DVDD
CSYNC
DGND
GND
CVBS
C
Y
13
D[13]
D[14]
13
D[12]
CHRONTEL
CH7004
Figure 3: 44-PIN TQFP
201-0000-024 Rev 2.1, 8/2/99
3
CHRONTEL
CH7004C
Table 1. Pin Descriptions
4
44-Pin
PLCC
44Pin
TQFP
Type
Symbol
Description
21-15
13-12,
10-4
15,14,
13,12,
11,10,
9,7,6,
4,3,
2,1,
44,43,42
In
D15-D0
Digital Pixel Inputs
These pins accept digital pixel data streams with either 8, 12, or 16-bit
multiplexed or 16-bit non-multiplexed formats, determined by the input
mode setting (see Registers and Programming section). Inputs D0 - D7
are used when operating in 8-bit multiplexed mode. Inputs D0 - D11 are
used when operating in 12-bit mode. Inputs D0 - D15 are used when
operating in 16-bit mode. The data structure and timing sequence for
each mode is described in the section on Digital Input Port.
43
37
Out
P-OUT
Pixel Clock Output
The CH7004, operating in master mode, provides a pixel data clocking
signal to the VGA controller. This pin provides the pixel clock output
signal (adjustable as X, 2X or 3X) to the VGA controller (see the section
on Digital Video Interface and Registers and Programming for more
details). The capacitive loading on this pin should be kept to a
minimum.
1
39
In
XCLK
Pixel Clock Input
To operate in a pure master mode, the P-OUT signal should be
connected to the XCLK input pin. To operate in a pseudo-master mode,
the P-OUT clock is used as a reference frequency, and a signal locked
to this output (at 1X, 1/2X, or 1/3X the P-OUT frequency) is input to the
XCLK pin. To operate in slave mode, the CH7004 accepts an external
pixel clock input at this pin. The capacitive loading on this pin should be
kept to a minimum.
3
41
In/Out
V
Vertical Sync Input/Output
This pin accepts the vertical sync signal from the VGA controller, or
outputs a vertical sync to the VGA controller. The capacitive loading on
this pin should kept to a minimum.
2
40
In/Out
H
Horizontal Sync Input/Output
This pin accepts the horizontal sync from the VGA controller, or outputs
a horizontal sync to the VGA controller. The capacitive loading on this
pin should be kept to a minimum.
41
35
Out
BCO
Buffered Clock Output
This pin provides a buffered output of the 14.31818 MHz crystal input
frequency for other devices and remains active at all times (including
power-down). The output can also be selected to be other frequencies
(see Registers and Programming).
38
32
In
XI
Crystal Input
A parallel resonance 14.31818 MHz (± 50 ppm) crystal should be
attached between XI and XO/FIN. However, if an external CMOS clock
is attached to XO/FIN, XI should be connected to ground.
39
33
In
XO/FIN
Crystal Output or External Fref
A 14.31818 MHz (± 50 ppm) crystal may be attached between XO/FIN
and XI. An external CMOS compatible clock can be connected to
XO/FIN as an alternative.
201-0000-024 Rev 2.1, 8/2/99
CHRONTEL
CH7004C
Table 1. Pin Descriptions
44-Pin
PLCC
44Pin
TQFP
Type
Symbol
Description
30
24
In
RSET
Reference Resistor
A 360 Ω resistor with short and wide traces should be attached
between RSET and ground. No other connections should be made to
this pin.
28
22
Out
Y/R
27
21
Out
C/G
26
20
Out
CVBS/B
Composite Video Output
A 75 Ω termination resistor with short traces should be attached
between CVBS and ground for optimum performance. In normal
operating modes other than SCART, this pin outputs the composite
video signal. In SCART mode, this pin outputs the blue signal.
23
17
Out
CSYNC
Composite Sync Output
A 75 Ω termination resistor with short traces should be attached
between CSYNC and ground for optimum performance. In SCART
mode, this pin outputs the composite sync signal.
32
26
In/Out
SD
Serial Data (External pull-up required)
This pin functions as the serial data pin of the I2C interface port (see the
I2C Port Operation section for details).
33
27
In
SC
Serial Clock (Internal pull-up)
This pin functions as the serial clock pin of the I 2C interface port (see
the I2C Port Operation section for details).
35
29
In
ADDR
40
34
Power
AGND
Analog ground
These pins provide the ground reference for the analog section of the
CH7004, and MUST be connected to the system ground, to prevent
latchup. Refer to the Application Information section for information on
proper supply de-coupling.
37
31
Power
AVDD
Analog Supply Voltage
These pins supply the 5V power to the analog section of the CH7004.
N/A
N/A
In/out
GPI 0
[3:0]
General Purpose I/O Pin
201-0000-024 Rev 2.1, 8/2/99
Luminance Output
A 75 Ω termination resistor with short traces should be attached
between Y and ground for optimum performance. In normal operating
modes other than SCART, this pin outputs the luma video signal. In
SCART mode, this pin outputs the red signal.
Chrominance Output
A 75 Ω termination resistor with short traces should be attached
between C and ground for optimum performance. In normal operating
modes other than SCART, this pin outputs the chroma video signal. In
SCART mode, this pin outputs the green signal.
I2C Address Select (Internal pull-up)
This pin is the I2C Address Select, which corresponds to bits 1 and 0 of
the I2C device address (see the I2C Port Operation section for details),
creating an address selection as follows:
ADDR
I2C Address Selected
1
1110101 = 75H = 117
0
1110110 = 76H = 118
5
CHRONTEL
CH7004C
Table 1. Pin Descriptions
44-Pin
PLCC
44Pin
TQFP
Type
Symbol
Description
31
25
Power
VDD
DAC Power Supply
These pins supply the 5V power to CH7004’s internal DAC’s.
29, 25
19,23
Power
GND
DAC Ground
These pins provide the ground reference for CH7004’s internal DACs.
For information on proper supply de-coupling, please refer to the
Application Information section.
44, 36,
22, 11
5,16,
30,38
Power
DVDD
Digital Supply Voltage
These pins supply the 3.3V power to the digital section of CH7004.
42, 34,
24, 14
8,18,
28,36
Power
DGND
Digital Ground
N/A
N/A
Out
R
R (Red) Component Output
This pin provides the analog Red component of the digital RGB input in
the RGB Pass-Through mode.
N/A
N/A
Out
G
G (Green) Component Output
This pin provides the analog Green component of the digital RGB input
in the RGB Pass-Through mode.
N/A
N/A
Out
B
B (Blue) Component Output
This pin provides the analog Blue component of the digital RGB input in
the RGB Pass-Through mode.
These pins provide the ground reference for the digital section of
CH7004, and MUST be connected to the system ground to prevent
latchup.
Digital Video Interface
The CH7004 digital video interface provides a flexible digital interface between a computer graphics controller and
the TV encoder IC, forming the ideal quality/cost configuration for performing the TV-output function. This digital
interface consists of up to 16 data signals and 4 control signals, all of which are subject to programmable control
through the CH7004 register set. This interface can be configured as 8, 12 or 16-bit inputs operating in either
multiplexed mode or 16-bit input operation in de-multiplexed mode. It will also accept either YCrCb or RGB (15,
16 or 24-bit) data formats and will accept both non-interlaced and interlaced data formats. A summary of the input
data format modes is as follows:
Table 2. Input Data Formats
6
Bus
Width
Transfer Mode
Color Space and Depth
Format Reference
16-bit
Non-multiplexed
RGB 16-bit
5-6-5 each word
15-bit
16-bit
Non-multiplexed
Non-multiplexed
RGB 15-bit
YCrCb (24-bit)
5-5-5 each word
CbY0,CrY1...(CCIR656 style)
8-bit
8-bit
2X-multiplexed
2X-multiplexed
RGB 15-bit
RGB 16-bit
5-5-5 over two bytes
5-6-5 over two bytes
8-bit
3X-multiplexed
RGB 24-bit
8-8-8 over three bytes
8-bit
12-bit
2X-multiplexed
2X-multiplexed
YCrCb (24-bit)
RGB 24
Cb,Y0,Cr,Y1,(CCIR656 style)
8-8-8 over two words - ‘C’ version
12-bit
16-bit
2X-multiplexed
2X-multiplexed
RGB 24
RGB 24 (32)
8-8-8 over two words - ‘I’ version
8-8,8X over two words
201-0000-024 Rev 2.1, 8/2/99
CHRONTEL
CH7004C
The clock and timing signals used to latch and process the incoming pixel data is dependent upon the clock mode.
The CH7004 can operate in either master (the CH7004 generates a pixel frequency which is either returned as a
phase-aligned pixel clock or used directly to latch data), or slave mode (the graphics chip generates the pixel clock).
The pixel clock frequency will change depending upon the active image size (e.g., 640x480 or 800x600), the desired
output format (NTSC or PAL), and the amount of scaling desired. The pixel clock may be requested to be 1X, 2X,
or 3X the pixel data rate (subject to a 100MHz frequency limitation). In the case of a 1X pixel clock the CH7004
will automatically use both clock edges, if a multiplexed data format is selected.
Sync Signals: Horizontal and vertical sync signals will normally be supplied by the VGA controller, but may be
selected to be generated by the CH7004. In the case of CCIR656 style input (IDF = 1 or 9), embedded sync may also
be used. (In each case, the period of the horizontal sync should be equal to the duration of the pixel clock, times the
first value of the (Total Pixels/Line x Total Lines/Frame) column of the Table 17 on page 32 (display Mode
Register OOH description). The leading edge of the horizontal sync is used to determine the start of each line. The
Vertical sync signal must be able to be set to the second value in the: (Total Pixels/Line x Total Lines/Frame)
column of Table 17 on page 32).
Master Clock Mode: The CH7004 generates a clock signal (output at the P-OUT pin) which will be used by the
VGA controller as a frequency reference. The VGA controller will then generate a clock signal which will be input
via the XCLK input. This incoming signal will be used to latch (and de-multiplex, if required) incoming data. The
XCLK input clock rate must match the input data rate, and the P-OUT clock can be requested to be 1X, 2X or 3X
the pixel data rate. As an alternative, the P-OUT clock signal can also be used as the input clock signal (connected
directly to the XCLK input) to latch the incoming data. If this mode is used, the incoming data must meet setup and
hold times with respect to the XCLK input (with the only internal adjustment being XCLK polarity).
Slave Clock Mode: The VGA controller will generate a clock which will be input to the XCLK pin (no clock signal
will be output on the P-OUT pin). This signal must match the input data rate, must occur at 1X, 2X or 3X the pixel
data rate, and will be used to latch (and de-multiplex if required) incoming data. Also, the graphics IC transmits
back to the TV encoder the horizontal and vertical timing signals, and pixel data, each of which must meet the
specified setup and hold times with respect to the pixel clock.
Pixel Data: Active pixel data will be expected after a programmable number pixels times the multiplex rate after the
leading edge of Horizontal Sync. In other words, specifying the horizontal back porch value (as a pixel count), plus
horizontal sync width, will determine when the chip will begin to sample pixels.
Non-multiplexed Mode
In the 15/16-bit mode shown in Figure 4, the pixel data bus represents a 15/16-bit non-multiplexed data stream,
which contains either RGB or YCrCb formatted data. When operating in RGB mode, each 15/16-bit Pn value will
contain a complete pixel encoded in either 5-6-5 or 5-5-5 format. When operating in YCrCb mode, each 16-bit Pn
word will contain an 8-bit Y (luminance) value on the upper 8 bits, and an 8-bit C (color difference) value on the
lower 8 bits. The color difference will be transmitted at half the data rate of the luminance data, with the sequencebeing set as Cb followed by Cr. The Cb and Cr data will be co-sited with the Y value transmitted with the Cb value,
with the data sequence described in Table 3. The first active pixel is SAV pixels after the trailing edge of horizontal
sync, where SAV is a bus-controlled register.
201-0000-024 Rev 2.1, 8/2/99
7
CHRONTEL
CH7004C
tHSW
HSYNC
ttPP1
tHD
tPH
PH 1
POut/
XCLK
ttSP1
SAV
AVR
SP
Pixel
Data
P0a
P0
P0b
P1
tHP
tHP1
P1a
P2
P1b
P3
P2a
P4
P2b
P5
Figure 4: Non-multiplexed Data Transfers
Table 3. 15/16-bit Non-multiplexed Data Formats
IDF#
Format
Pixel#
Bus Data
8
0
RGB 5-6-5
D[15]
D[14]
D[13]
D[12]
D[11]
D[10]
D[9]
D[8]
D[7]
D[6]
D[5]
D[4]
D[3]
D[2]
D[1]
D[0]
P0
R0[4]
R0[3]
R0[2]
R0[1]
R0[0]
G0[5]
G0[4]
G0[3]
G0[2]
G0[1]
G0[0]
B0[4]
B0[3]
B0[2]
B0[1]
B0[0]
P1
R1[4]
R1[3]
R1[2]
R1[1]
R1[0]
G1[5]
G1[4]
G1[3]
G1[2]
G1[1]
G1[0]
B1[4]
B1[3]
B1[2]
B1[1]
B1[0]
3
RGB 5-5-5
P2
x
R2[4]
R2[3]
R2[2]
R2[1]
R2[0]
G2[4]
G2[3]
G2[2]
G2[1]
G2[0]
B2[4]
B2[3]
B2[2]
B2[1]
B2[0]
P3
x
R3[4]
R3[3]
R3[2]
R3[1]
R3[0]
G3[4]
G3[3]
G3[2]
G3[1]
G3[0]
B3[4]
B3[3]
B3[2]
B3[1]
B3[0]
1
YCrCb (16-bit)
P0
Y0[7]
Y0[6]
Y0[5]
Y0[4]
Y0[3]
Y0[2]
Y0[1]
Y0[0]
Cb0[7]
Cb0[6]
Cb0[5]
Cb0[4]
Cb0[3]
Cb0[2]
Cb0[1]
Cb0[0]
P1
Y1[7]
Y1[6]
Y1[5]
Y1[4]
Y1[3]
Y1[2]
Y1[1]
Y1[0]
Cr0[7]
Cr0[6]
Cr0[5]
Cr0[4]
Cr0[3]
Cr0[2]
Cr0[1]
Cr0[0]
P2
Y2[7]
Y2[6]
Y2[5]
Y2[4]
Y2[3]
Y2[2]
Y2[1]
Y2[0]
Cb2[7]
Cb2[6]
Cb2[5]
Cb2[4]
Cb2[3]
Cb2[2]
Cb2[1]
Cb2[0]
P3
Y3[7]
Y3[6]
Y3[5]
Y3[4]
Y3[3]
Y3[2]
Y3[1]
Y3[0]
Cr2[7]
Cr2[6]
Cr2[5]
Cr2[4]
Cr2[3]
Cr2[2]
Cr2[1]
Cr2[0]
201-0000-024 Rev 2.1, 8/2/99
CHRONTEL
CH7004C
Digital Video Interface (continued)
When IDF = 1, (YCrCb 16-bit mode), H and V sync signals can be embedded into the data stream. In this mode, the
embedded sync will be similar to the CCIR656 convention (not identical, since that convention is for 8-bit data
streams), and the first byte of the ‘video timing reference code’ will be assumed to occur when a Cb sample would
occur – if the video stream was continuous. This is delineated in Table 4 below.
Table 4. YCrCb Non-multiplexed Mode with Embedded Syncs
IDF#
Format
Pixel#
Bus Data
1
YCrCb 16-bit
D[15]
D[14]
D[13]
D[12]
D[11]
D[10]
D[9]
D[8]
D[7]
D[6]
D[5]
D[4]
D[3]
D[2]
D[1]
D[0]
P0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
P1
S[7]
S[6]
S[5]
S[4]
S[3]
S[2]
S[1]
S[0]
00
0
0
0
0
0
0
0
P2
Y0[7]
Y0[6]
Y0[5]
Y0[4]
Y0[3]
Y0[2]
Y0[1]
Y0[0]
Cb0[7]
Cb0[6]
Cb0[5]
Cb0[4]
Cb0[3]
Cb0[2]
Cb0[1]
Cb0[0]
P3
Y1[7]
Y1[6]
Y1[5]
Y1[4]
Y1[3]
Y1[2]
Y1[1]
Y1[0]
Cr0[7]
Cr0[6]
Cr0[5]
Cr0[4]
Cr0[3]
Cr0[2]
Cr0[1]
Cr0[0]
P4
Y2[7]
Y2[6]
Y2[5]
Y2[4]
Y2[3]
Y2[2]
Y2[1]
Y2[0]
Cb2[7]
Cb2[6]
Cb2[5]
Cb2[4]
Cb2[3]
Cb2[2]
Cb2[1]
Cb2[0]
P5
Y3[7]
Y3[6]
Y3[5]
Y3[4]
Y3[3]
Y3[2]
Y3[1]
Y3[0]
Cr2[7]
Cr2[6]
Cr2[5]
Cr2[4]
Cr2[3]
Cr2[2]
Cr2[1]
Cr2[0]
P6
Y4[7]
Y4[6]
Y4[5]
Y4[4]
Y4[3]
Y4[2]
Y4[1]
Y4[0]
Cb4[7]
Cb4[6]
Cb4[5]
Cb4[4]
Cb4[3]
Cb4[2]
Cb4[1]
Cb4[0]
P7
Y5[7]
Y5[6]
Y5[5]
Y5[4]
Y5[3]
Y5[2]
Y5[1]
Y5[0]
Cr4[7]
Cr4[6]
Cr4[5]
Cr4[4]
Cr4[3]
Cr4[2]
Cr4[1]
Cr4[0]
In this mode, the S[7-0] byte contains the following data:
S[6]
S[5]
S[4]
=
=
=
F
V
H
=
=
=
1 during field 2, 0 during field 1
1 during field blanking, 0 elsewhere
1 during EAV (the synchronization reference at the end of active video)
0 during SAV (the synchronization reference at the start of active video)
Bits S[7] and S[3.0] are ignored.
Multiplexed Mode
Each rising edge (or each rising and falling edge) of the XCLK signal will latch data from the graphics chip. The
multiplexed input data formats are shown in Figure 5 and 6. The Pixel Data bus represents an 8, 12, or 16-bit
multiplexed data stream, which contains either RGB or YCrCb formatted data. In IDF settings of 2, 4, 5, 7, 8, and 9,
the input data rate is 2X PCLK, and each pair of Pn values (e.g., P0a and P0b) will contain a complete pixel,
encoded as shown in the tables below. When IDF = 6, the input data rate is 3X PCLK, and each triplet of Pn values
(e.g., P0a, P0b and P0c) will contain a complete pixel, encoded as shown in the tables below. When the input is
YCrCb, the color-difference data will be transmitted at half the data rate of the luminance data, with the sequence
being set as Cb, Y, Cr, Y where Cb0,Y0,Cr0 refers to co-sited luminance and color-difference samples — and the
following Y1 byte refers to the next luminance sample, per CCIR656 standards. However, the clock frequency is
dependent upon the current mode, (not 27MHz, as specified in CCIR656).
201-0000-024 Rev 2.1, 8/2/99
9
CHRONTEL
CH7004C
Digital Video Interface (continued)
tHSW
HS
tP2
tHD
tPH2
XCLK
DEC = 0
tSP2
tHP2
XCLK
DEC = 1
tSP2
D[15:0]
P0a
P0b
P1a
tHP2
P1b
tSP2
tHP2
P2a
P2b
Figure 5: Multiplexed Pixel Data Transfer Mode
Table 5.RGB 8-bit Multiplexed Mode
IDF#
Format
Pixel#
Bus Data
7
RGB 5-6-5
D[7]
D[6]
D[5]
D[4]
D[3]
D[2]
D[1]
D[0]
P0a
G0[2]
G0[1]
G0[0]
B0[4]
B0[3]
B0[2]
B0[1]
B0[0]
P0b
R0[4]
R0[3]
R0[2]
R0[1]
R0[0]
G0[5]
G0[4]
G0[3]
P1a
G1[2]
G1[1]
G1[0]
B1[4]
B1[3]
B1[2]
B1[1]
B1[0]
8
RGB 5-5-5
P1b
R1[4]
R1[3]
R1[2]
R1[1]
R1[0]
G1[5]
G1[4]
G1[3]
P0a
G0[2]
G0[1]
G0[0]
B0[4]
B0[3]
B0[2]
B0[1]
B0[0]
P0b
x
R0[4]
R0[3]
R0[2]
R0[1]
R0[0]
G0[4]
G0[3]
P1a
G1[2]
G1[1]
G1[0]
B1[4]
B1[3]
B1[2]
B1[1]
B1[0]
P1b
x
R1[4]
R1[3]
R1[2]
R1[1]
R1[0]
G1[4]
G1[3]
Table 6. RGB 12-bit Multiplexed Mode
IDF#
Format
Pixel#
Bus Data
10
4
12-bit RGB (12-12)
D[11]
D[10]
D[9]
D[8]
D[7]
D[6]
D[5]
D[4]
D[3]
D[2]
D[1]
D[0]
P0a
G0[3]
G0[2]
G0[1]
G0[0]
B0[7]
B0[6]
B0[5]
B0[4]
B0[3]
B0[2]
B0[1]
B0[0]
P0b
R0[7]
R0[6]
R0[5]
R0[4]
R0[3]
R0[2]
R0[1]
R0[0]
G0[7]
G0[6]
G0[5]
G0[4]
P1a
G1[3]
G1[2]
G1[1]
G1[0]
B1[7]
B1[6]
B1[5]
B1[4]
B1[3]
B1[2]
B1[1]
B1[0]
5
12-bit RGB (12-12)
P1b
R1[7]
R1[6]
R1[5]
R1[4]
R1[3]
R1[2]
R1[1]
R1[0]
G1[7]
G1[6]
G1[5]
G1[4]
P0a
G0[4]
G0[3]
G0[2]
B0[7]
B0[6]
B0[5]
B0[4]
B0[3]
G0[0]
B0[2]
B0[1]
B0[0]
P0b
R0[7]
R0[6]
R0[5]
R0[4]
R0[3]
G0[7]
G0[6]
G0[5]
R0[2]
R0[1]
R0[0]
G0[1]
P1a
G1[4]
G1[3]
G1[2]
B1[7]
B1[6]
B1[7]
B1[4]
B1[3]
G1[0]
B1[2]
B1[1]
B1[0]
P1b
R1[7]
R1[6]
R1[5]
R1[4]
R1[3]
G1[7]
G1[6]
G1[5]
R1[2]
R1[1]
R1[0]
G1[1]
201-0000-024 Rev 2.1, 8/2/99
CHRONTEL
CH7004C
Digital Video Interface (continued)
Table 7. RGB 16-bit Muliplexed Mode
IDF#
Format
Pixel#
Bus Data
2
16-bit RGB (16-8)
D[15]
D[14]
D[13]
D[12]
D[11]
D[10]
D[9]
D[8]
D[7]
D[6]
D[5]
D[4]
D[3]
D[2]
D[1]
D[0]
P0a
G0[7]
G0[6]
G0[5]
G0[4]
G0[3]
G0[2]
G0[1]
G0[0]
B0[7]
B0[6]
B0[5]
B0[4]
B0[3]
B0[2]
B0[1]
B0[0]
P0b
A0[7]
A0[6]
A0[5]
A0[4]
A0[3]
A0[2]
A0[1]
A0[0]
R0[7]
R0[6]
R0[5]
R0[4]
R0[3]
R0[2]
R0[1]
R0[0]
P1a
G1[7]
G1[6]
G1[5]
G1[4]
G1[3]
G1[2]
G1[1]
G1[0]
B1[7]
B1[6]
B1[5]
B1[4]
B1[3]
B1[2]
B0[1]
B0[0]
P1b
R1[7]
R1[6]
R1[5]
R1[4]
R1[3]
R1[2]
R1[1]
R1[0]
A1[7]
A1[6]
A1[5]
A1[4]
A1[3]
A1[2]
A1[1]
A1[0]
Note: The AX[7:0] data is ignored.
Table 8. YCrCb Multiplexed Mode
IDF#
Format
Pixel#
Bus Data
9
YCrCb 8-bit
D[7]
D[6]
D[5]
D[4]
D[3]
D[2]
D[1]
D[0]
P0a
Cb0[7]
Cb0[6]
Cb0[5]
Cb0[4]
Cb0[3]
Cb0[2]
Cb0[1]
Cb0[0]
P0b
Y0[7]
Y0[6]
Y0[5]
Y0[4]
Y0[3]
Y0[2]
Y0[1]
Y0[0]
P1a
Cr0[7]
Cr0[6]
Cr0[5]
Cr0[4]
Cr0[3]
Cr0[2]
Cr0[1]
Cr0[0]
P1b
Y1[7]
Y1[6]
Y1[5]
Y1[4]
Y1[3]
Y1[2]
Y1[1]
Y1[0]
P2a
Cb2[7]
Cb2[6]
Cb2[5]
Cb2[4]
Cb2[3]
Cb2[2]
Cb2[1]
Cb2[0]
P2b
Y2[7]
Y2[6]
Y2[5]
Y2[4]
Y2[3]
Y2[2]
Y2[1]
Y2[0]
P3a
Cr2[7]
Cr2[6]
Cr2[5]
Cr2[4]
Cr2[3]
Cr2[2]
Cr2[1]
Cr2[0]
P3b
Y3[7]
Y3[6]
Y3[5]
Y3[4]
Y3[3]
Y3[2]
Y3[1]
Y3[0]
When IDF = 9 (YCrCb 8-bit mode), H and V sync signals can be embedded into the data stream. In this mode, the
embedded sync will follow the CCIR656 convention, and the first byte of the “video timing reference code” will be
assumed to occur when a Cb sample would occur if the video stream was continuous. This is delineated in Table 9
shown below.
201-0000-024 Rev 2.1, 8/2/99
11
CHRONTEL
CH7004C
Digital Video Interface (continued)
Table 9. YCrCb Multiplexed Mode with Embedded Syncs
IDF#
Format
Pixel#
Bus Data
9
YCrCb 8-bit
P0a
FF
FF
FF
FF
FF
FF
FF
FF
D[7]
D[6]
D[5]
D[4]
D[3]
D[2]
D[1]
D[0]
P0b
00
00
00
00
00
00
00
00
P1a
00
00
00
00
00
00
00
00
P1b
S[7]
S[6]
S[5]
S[4]
S[3]
S[2]
S[1]
S[0]
P2a
Cb2[7]
Cb2[6]
Cb2[5]
Cb2[4]
Cb2[3]
Cb2[2]
Cb2[1]
Cb2[0]
P2b
Y2[7]
Y2[6]
Y2[5]
Y2[4]
Y2[3]
Y2[2]
Y2[1]
Y2[0]
P3a
Cr2[7]
Cr2[6]
Cr2[5]
Cr2[4]
Cr2[3]
Cr2[2]
Cr2[1]
Cr2[0]
P3b
Y3[7]
Y3[6]
Y3[5]
Y3[4]
Y3[3]
Y3[2]
Y3[1]
Y3[0]
In this mode the S[7.0} contains the following data:
S[6]
S[5]
S[4]
=
=
=
F
V
H
=
=
=
1 during field 2, 0 during field 1
1 during field blanking, 0 elsewhere
1 during EAV (the synchronization reference at the end of active video)
0 during SAV (the synchronization reference at the start of active video)
Bits S[7] and S[3-0] are ignored.
tHSW
HSYNC
tP3
tHD
tPH3
POut/
XCLK
tSP3
Pixel
D[7:0]
Data
P0a
tHP3
P0b
P0c
P1a
P1b
P1c
Figure 6: Multiplexed Pixel Data Transfer Mode (IDF = 6)
Table 10. RGB 8-bit Multiplexed Mode (24-bit Color)
IDF#
Format
Pixel#
Bus Data
12
6
RGB 8-bit
D[7]
D[6]
D[5]
D[4]
D[3]
D[2]
D[1]
D[0]
P0a
B0[7]
B0[6]
B0[5]
B0[4]
B0[3]
B0[2]
B0[1]
B0[0]
P0b
G0[7]
G0[6]
G0[5]
G0[4]
G0[3]
G0[2]
G0[1]
G0[0]
P0c
R0[7]
R0[6]
R0[5]
R0[4]
R0[3]
R0[2]
R0[1]
R0[0]
P1a
B1[7]
B1[6]
B1[5]
B1[4]
B1[3]
B1[2]
B1[1]
B1[0]
P1b
G1[7]
G1[6]
G1[5]
G1[4]
G1[3]
G1[2]
G1[1]
G1[0]
P1c
R1[7]
R1[6]
R1[5]
R1[4]
R1[3]
R1[2]
R1[1]
R1[0]
P2a
B2[7]
B2[6]
B2[5]
B2[4]
B2[3]
B2[2]
B2[1]
B2[0]
P2b
G2[7]
G2[6]
G2[5]
G2[4]
G2[3]
G2[2]
G2[1]
G2[0]
P2c
R2(7)
R2(6)
R2(5)
R2(4)
R2(3)
R2(2)
R2(1)
R2(0)
201-0000-024 Rev 2.1, 8/2/99
Chrontel
CH7004C
Functional Description
The CH7004 is a TV-output companion chip to graphics controllers providing digital output in either YUV or RGB
format. This solution involves both hardware and software elements which work together to produce an optimum
TV screen image based on the original computer generated pixel data. All essential circuitry for this conversion are
integrated on-chip. On-chip circuitry includes memory, memory control, scaling, PLL, DAC, filters, and
NTSC/PAL encoder. All internal signal processing, including NTSC/PAL encoding, is performed using digital
techniques to ensure that the high-quality video signals are not affected by drift issues associated with analog
components. No additional adjustment is required during manufacturing.
CH7004 is ideal for PC motherboards, web browsers, or VGA add-in boards where a minimum of discrete support
components (passive components, parallel resonance 14.31818 MHz crystal) are required for full operation.
Architectural Overview
The CH7004 is a complete TV output subsystem which uses both hardware and software elements to produce an
image on TV which is virtually identical to the image that would be displayed on a monitor. Simply creating a
compatible TV output from a VGA input involves a relatively straightforward process. This process includes a
standard conversion from RGB to YUV color space, converting from a non-interlaced to an interlaced frame
sequence, and encoding the pixel stream into NTSC or PAL compliant format. However, creating an optimum
computer-generated image on a TV screen involves a highly sophisticated process of scaling, deflickering, and
filtering. This results in a compatible TV output that displays a sharp and subtle image, of the right size, with
minimal artifacts from the conversion process.
As a key part of the overall system solution, the CH7004 software establishes the correct framework for the VGA
input signal to enable this process. Once the display is set to a supported resolution (either 640x480 or 800x600), the
CH7004 software may be invoked to establish the appropriate TV output display. The software then programs the
various timing parameters of the VGA controller to create an output signal that will be compatible with the chosen
resolution, operating mode, and TV format. Adjustments performed in software include pixel clock rates, total
pixels per line, and total lines per frame. By performing these adjustments in software, the CH7004 can render a
superior TV image without the added cost of a full frame buffer memory – normally used to implement features
such as scaling and full synchronization.
The CH7004 hardware accepts digital RGB or YCrCb inputs, which are latched in synchronization with the pixel
clock. These inputs are then color-space converted into YUV in 4-2-2 format and stored in a line buffer memory.
The stored pixels are fed into a block where scan-rate conversion, underscan scaling and 2-line, 3-line, 4-line and 5line vertical flicker filtering are performed. The scan-rate converter transforms the VGA horizontal scan-rate to
either NTSC or PAL scan rates; the vertical flicker filter eliminates flicker at the output while the underscan scaling
reduces the size of the displayed image to fit onto a TV screen. The resulting YUV signals are filtered through
digital filters to minimize aliasing problems. The digital encoder receives the filtered signals and transforms them to
composite and S-Video outputs, which are converted by the three 9-bit DACs into analog outputs.
Color Burst Generation*
The CH7004 allows the sub-carrier frequency to be accurately generated from a 14.31818 MHz crystal oscillator,
leaving the sub-carrier frequency independent of the sampling rate. As a result, the CH7004 may be used with any
VGA chip (with an appropriate digital interface) since the CH7004 sub-carrier frequency can be generated without
being dependent on the precise pixel rates of VGA controllers. This feature is a significant benefit, since even a ±
0.01% sub-carrier frequency variation may be enough to cause some television monitors to lose color lock.
In addition, the CH7004 has the capability to genlock the color burst signal to the VGA horizontal sync frequency,
which enables a fully synchronous system between the graphics controller and the television. When genlocked, the
CH7004 can also stop “dot crawl” motion (for composite mode operation in NTSC modes) to eliminate the
annoyance of moving borders. Both of these features are under programmable control through the register set.
Display Modes
The CH7004 display mode is controlled by three independent factors: input resolution, TV format, and scale factor,
which are programmed via the display mode register. It is designed to accept input resolutions of 640x480,
800x600, 640x400 (including 320x200 scan-doubled output), 720x400, and 512x384. It is designed to support
201-0000-024 Rev 2.1, 8/2/99
*Patent number 5,874,846
13
CHRONTEL
CH7004C
Display Modes (continued)
output to either NTSC or PAL television formats. The CH7004 provides interpolated scaling with selectable factors
of 5:4, 1:1, 7:8, 5:6, 3:4 and 7:10 in order to support adjustable overscan or underscan operation when displayed on
a TV. This combination of factors results in a matrix of useful operating modes which are listed in detail in
Table 11.
Table 11. CH7004 Display Modes
Input
(active)
Resolution
Scale
Factor
Active
TV Lines
Percent (1)
Overscan
Pixel
Clock
Horizontal
Total
Vertical
Total
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
640x480
640x480
640x480
800x600
800x600
800x600
640x400
640x400
640x400
720x400
720x400
512x384
512x384
1:1
7:8
5:6
5:6
3:4
7:10
5:4
1:1
7:8
5:4
1:1
5:4
1:1
480
420
400
500
450
420
500
400
350
500
400
480
384
10%
(3%)
(8%)
16%
4%
(3%)
16%
(8%)
(19%)
16%
(8%)
10%
(11%)
24.671
28.196
30.210
39.273
43.636
47.832
21.147
26.434
30.210
23.790
29.455
20.140
24.671
784
784
800
1040
1040
1064
840
840
840
945
936
800
784
525
600
630
630
700
750
420
525
600
420
525
420
525
PAL
PAL
PAL
PAL
PAL
PAL
PAL
PAL
PAL
PAL
PAL
PAL
640x480
640x480
640x480
800x600
800x600
800x600
640x400
640x400
720x400
720x400
512x384
512x384
5:4
1:1
5:6
1:1
5:6
3:4
5:4
1:1
5:4
1:1
5:4
1:1
600
480
400
600
500
450
500
400
500
400
480
384
14%
(8%)
(29%)
14%
(4%)
(15%)
(4%)
(29%)
(4%)
(29%)
(8%)
(35%)
21.000
26.250
31.500
29.500
36.000
39.000
25.000
31.500
28.125
34.875
21.000
26.250
840
840
840
944
960
936
1000
1008
1125
1116
840
840
500
625
750
625
750
836
500
625
500
625
500
625
TV Format
Standard
(1) Note:Percent underscan is a calculated value based on average viewable lines on each TV format, assuming an average TV ovescan
of 10%. (Negative values) indicate modes which are operating in underscan.
For NTSC: 480 active lines - 10% (overscan) = 432 viewable lines (average)
For PAL: 576 active lines - 10% (overscan) = 518 viewable lines (average)
The inclusion of multiple levels of scaling for each resolution have been created to enable optimal use of the
CH7004 for different application needs. In general, underscan (modes where percent overscan is negative provides
an image that is viewable in its entirety on screen; it should be used as the default for most applications (e.g.,
viewing text screens, operating games, running productivity applications and working within Windows).
Overscanning provides an image that extends past the edges of the TV screen, exactly like normal television
programs and movies appear on TV, and is only recommended for viewing movies or video clips coming from the
computer. In addition to the above mode table, the CH7004 also support interlaced input modes, both in CCIR 656
and proprietary formats (see Display Mode Register section.)
Flicker Filter and Text Enhancement
The CH7004 integrates an advanced 2-line, 3-line, 4-line and 5-line (depending on mode) vertical deflickering filter
circuit to help eliminate the flicker associated with interlaced displays. This flicker circuit provides an adaptive filter
algorithm for implementing flicker reduction with selections of high, medium or low flicker content for both luma
and chroma channels (see register descriptions). In addition, a special text enhancement circuit incorporates
14
201-0000-024 Rev 2.1, 8/2/99
CHRONTEL
CH7004C
Display Modes (continued)
proprietory Algorithms for enhancing the readability of text. These modes are fully programmable via I2C under the
flicker filter register.
Internal Voltage Reference
An on-chip bandgap circuit is used in the DAC to generate a reference voltage which, in conjunction with a
reference resistor at pin RSET, and register controlled divider, sets the output ranges of the DACs. The CH7004
bandgap reference voltage is 1.235 volts nominal for NTSC or PAL-M, or 1.317 volts nominal (for PAL or NTSCJ), which is determined by IDF register bit 6 (DACG bit). The recommended value for the reference resistor RSET
is 360 ohms (though this may be adjusted in order to achieve a different output level). The gain setting for DAC
output is 1/48 th. Therefore, for each DAC, the current output per LSB step is determined by the following equation:
ILSB = V(RSET)/RSET reference resistor * 1/GAIN
For DACG=0, this is: ILSB = 1.235/360 * 1/48 = 71.4 µA (nominal)
For DACG=1, this is: ILSB = 1.317/360 * 1/48 = 76.2 µA (nominal)
Power Management
The CH7004 supports five operating states including Normal [On], Power Down, Full Power Down, S-Video Off,
and Composite Off to provide optimal power consumption for the application involved. Using the programmable
power down modes accessed over the I2C port, the CH7004 may be placed in either Normal state, or any of the four
power managed states, as listed below (see “Power Management Register” under the Register Descriptions section
for programming information). To support power management, a TV sensing function (see “Connection Detect
Register” under the Register Descriptions section) is provided, which identifies whether a TV is connected to either
S-Video or composite. This sensing function can then be used to enter into the appropriate operating state (e.g., if
TV is sensed only on composite, the S-Video Off mode could be set by software).
Table 12.Power Management
Operating State
Functional Description
Normal (On):
In the normal operating state, all functions and pins are active
Power Down:
In the power-down state, most pins and circuitry are disabled.The
BCO pin will continue to provide either the VCO divided by K3, or
14.318 MHz out, and the P-OUT pin will continue to output a clock
reference.
S-Video Off:
Power is shut off to the unused DACs associated with S-Video
outputs.
Composite Off:
In Composite-off state, power is shut off to the unused DAC
associated with CVBS output.
Full Power Down:
In this power-down state, all but the I2C circuits are disabled. This
places the CH7004 in its lowest power consumption mode.
Luminance and Chrominance Filter Options
The CH7004 contains a set of luminance filters to provide a controllable bandwidth output on both CVBS and SVideo outputs. All values are completely programmable via the Video Bandwidth Register. For all graphs shown,
the horizontal axis is frequency in MHz, and the vertical axis is attenuation in dBs. The composite luminance and
chrominance video bandwidth output is shown in Table 13.
MacrovisionTM Anti-copy Protection
The CH7004 implements the Macrovision 7.X anti-copy protection process. This process changes the encoded
output of the NTSC/PAL signals to inhibit recording on VCR devices while not affecting viewing on a TV. The
parameters that control this process are fully programmable and can be described by Chrontel only after a suitable
Non-Disclosure Agreement has been executed between MacrovisionTM, Inc. and the customer.
201-0000-024 Rev 2.1, 8/2/99
15
CHRONTEL
CH7004C
VBI Pass-Through Support
The CH7004 provides the ability to pass-through data with minimal filtering, on vertical blanking lines 10-21 for
Intercast or close captioned applications (see register descriptions).
Table 13. Video Bandwidth
Mode
Chrominance
Luminance Bandwidth with Sin(X) /X (MHz)
CVBS
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
00
0.62
0.78
0.53
0.65
0.83
1.03
0.70
0.87
0.74
0.93
0.63
0.78
0.89
0.62
0.78
0.93
0.64
0.74
0.79
0.77
0.95
1.02
0.77
0.86
0.94
0.71
0.71
0.47
0.38
CBW[1:0]
01
10
0.68
0.80
0.85
1.00
0.58
0.68
0.71
0.83
0.91
1.07
1.13
1.32
0.77
0.90
0.95
1.12
0.81
0.95
1.02
1.20
0.68
0.80
0.86
1.00
0.98
1.15
0.68
0.80
0.85
1.00
1.02
1.20
0.71
0.83
0.81
0.95
0.87
1.02
0.85
1.00
1.03
1.22
1.12
1.32
0.85
0.99
0.94
1.11
1.03
1.21
0.78
0.91
0.78
0.91
0.51
0.60
0.41
0.48
S-Video
YCV
11
0.95
1.18
0.81
0.99
1.27
1.57
1.07
1.33
1.13
1.42
0.95
1.19
1.36
0.95
1.18
1.42
0.98
1.13
1.21
1.18
1.44
1.56
1.18
1.31
1.44
1.08
1.08
0.71
0.57
0
2.26
2.82
1.93
2.36
3.03
3.75
2.56
3.17
2.69
3.39
2.28
2.84
3.25
2.26
2.82
3.39
2.35
2.70
2.89
2.82
3.44
3.73
2.82
3.13
3.43
2.58
2.58
1.70
1.37
1
3.37
4.21
2.87
3.52
4.51
5.59
3.81
4.72
4.01
5.05
3.39
4.24
4.84
3.37
4.21
5.05
3.50
4.02
4.31
4.20
5.13
5.56
4.20
4.66
5.11
3.85
3.85
2.53
2.04
S-Video
YSV[1:0], YPEAK = 0
00
01
1X
2.26
3.37
5.23
2.82
4.21
6.53
1.93
2.87
4.46
2.36
3.52
5.46
3.03
4.51
7.00
3.75
5.59
8.68
2.56
3.81
5.92
3.17
4.72
7.33
2.69
4.01
6.22
3.39
5.05
7.84
2.28
3.39
5.26
2.84
4.24
6.58
3.25
4.84
7.52
2.26
3.37
5.23
2.82
4.21
6.53
3.39
5.05
7.84
2.35
3.50
5.43
2.70
4.02
6.24
2.89
4.31
6.68
2.82
4.20
6.53
3.44
5.13
7.97
3.73
5.56
8.63
2.82
4.20
6.52
3.13
4.66
7.24
3.43
5.11
7.94
2.58
3.85
5.97
2.58
3.85
5.97
1.70
2.53
3.92
1.37
2.04
3.17
YSV[1:0], YPEAK = 1
00
01
1X
2.57
4.44
5.23
3.21
5.56
6.53
2.19
3.79
4.46
2.68
4.64
5.46
3.44
5.95
7.00
4.27
7.38
8.68
2.91
5.04
5.92
3.60
6.23
7.33
3.06
5.29
6.22
3.85
6.67
7.84
2.59
4.48
5.26
3.23
5.59
6.58
3.70
6.39
7.52
2.57
4.44
5.23
3.21
5.56
6.53
3.85
6.67
7.84
2.67
4.62
5.43
3.07
5.30
6.24
3.29
5.68
6.68
3.21
5.55
6.53
3.92
6.77
7.97
4.24
7.34
8.63
3.20
5.54
6.52
3.56
6.16
7.24
3.90
6.75
7.94
2.94
5.08
5.97
2.94
5.08
5.97
1.93
3.34
3.92
1.56
2.69
3.17
The composite luminance and chrominance frequency response is depicted in Figure 7 through 9.
16
201-0000-024 Rev 2.1, 8/2/99
CHRONTEL
CH7004C
Luminance and Chrominance Filter Options (continued)
00
-66
-12
12
-18
18
(YCVdB
YCVdB


)
nn
-24
24
-30
30
-36
36
-42
42
00
1
22
1
33
44
55
fn,i
f
66
77
88
99
10
10
11
11
12
12
n,i
106 10 6
Figure 7: Composite Luminance Frequency Response (YCV = 0)
0
-6
-12
-18

YSVdB

(YSVdB
)n
-24
-30
-36
-42
0
1
2
3
4
5
6
7
8
9
10
11
12
f
n, i
6
10
Figure 8: S-Video Luminance Frequency Response (YSV = 1X, YPEAK = 0)
201-0000-024 Rev 2.1, 8/2/99
17
CHRONTEL
CH7004C
Luminance and Chrominance Filter Options (continued)
00
-66
-12
12
18
-18

UVfirdB
n
(UVfirdB)n
24
-24
30
-30
36
-36
42
-42
00
11
22
3
44
55
66
77
8
8
99
10
10
11
11
12
12
fn,ifn , i
66
1010
Figure 9: Chrominance Frequency Response
18
201-0000-024 Rev 2.1, 8/2/99
CHRONTEL
CH7004C
NTSC and PAL Operation
Composite and S-Video outputs are supported in either NTSC or PAL format. The general parameters used to
characterize these outputs are listed in Table 14 and shown in Figure 10. (See Figure 13 through 18 for
illustrations of composite and S-Video output waveforms.)
CCIR624-3 Compliance
The CH7004 is predominantly compliant with the recommendations called out in CCIR624-3. The following are
the only exceptions to this compliance:
• The frequencies of Fsc, Fh, and Fv can only be guaranteed in master or pseudo-master modes, not in slave mode
when the graphics device generates these frequencies.
• It is assumed that gamma correction, if required, is performed in the graphics device which establishes the color
reference signals.
• All modes provide the exact number of lines called out for NTSC and PAL modes respectively, except mode 21,
which outputs 800x600 resolution, scaled by 3:4, to PAL format with a total of 627 lines (vs. 625).
• Chroma signal frequency response will fall within 10% of the exact recommended value.
• Pulse widths and rise/fall times for sync pulses, front/back porches, and equalizing pulses are designed to
approximate CCIR624-3 requirements, but will fall into a range of values due to the variety of clock frequencies
used to support multiple operating modes
Table 14. NTSC/PAL Composite Output Timing Parameters (in µS)
Symbol
Level (mV)
Description
Duration (uS)
NTSC
PAL
NTSC
PAL
287
300
1.49 - 1.51
1.48 - 1.51
0
0
4.69 - 4.72
4.69 - 4.71
A
Front Porch
B
Horizontal Sync
C
Breezeway
287
300
0.59 - 0.61
0.88 - 0.92
D
Color Burst
287
300
2.50 - 2.53
2.24 - 2.26
E
Back Porch
287
300
1.55 - 1.61
2.62 - 2.71
F
Black
340
300
0.00 - 7.50
0.00 - 8.67
G
Active Video
340
300
37.66 - 52.67
34.68 - 52.01
H
Black
340
300
0.00 - 7.50
0.00 - 8.67
For this table and all subsequent figures, key values are:
Note:
1.
2.
3.
4.
RSET = 360 ohms; V(RSET) = 1.235V; 75 ohms doubly terminated load.
Durations vary slightly in different modes due to the different clock frequencies used.
Active video and black (F, G, H) times vary greatly due to different scaling ratios used in different modes.
Black times (F and H) vary with position controls.
201-0000-024 Rev 2.1, 8/2/99
19
CHRONTEL
A
CH7004C
B
C
D
E
F
G
H
Figure 10: NTSC / PAL Composite Output
START
START
O
OF
F
V
VS
SY
YN
NC
C
A
N
NA
ALLO
OG
G
StartA
of
field FIELD
1
FIELD
11
523
520
520
524
521
521
525
522
522
523
523
1
524
524
2
3
525
525
114
Pre-equalizing
pulse interval
22
5
336
447
669
558
10
77
12
9
9
11
88
Post-equalizing
pulse interval
Vertical sync
pulse interval
Reference
Line
A
AN
NA
ALLO
OG
G
vertical
sub-carrier
phase
FIELD
FIELD
t1+V interval
color
field 2
12
261
258
258
262
259
259
263
260
260
264
261
261
265
262
262
267
264
264
266
263
263
268
265
265
270
267
267
269
266
266
271
268
268
272
269
269
273
270
270
274
271
271
275
272
272
START
OF
VSYNC
Start of
field 2
Reference
ANALOG
sub-carrier
FIELD 1 phaset2+V
color field 2
523
520
524
521
525
522
523
1
Start of
field 3
2
524
14
525
3
36
25
7
4
85
10
7
9
6
12
9
11
8
Reference
ANALOG
sub-carrier
FIELD phase
2
t3+V
color field 3
261
258
262
259
263
260
264
261
262
265
266
263
264
267
265
268
269
266
270
267
268
271
272
269
273
270
274
271
272
275
Start of
field 4
Reference
sub-carrier phase
color field 4
Figure 11: Interlaced NTSC Video Timing
20
201-0000-024 Rev 2.1, 8/2/99
CHRONTEL
CH7004C
START
OF
VSYNC
ANALOG
FIELD 1
620
620
621
621
622
622
623
623
624
625
1
2
3
4
5
6
6
7
7
8
8
9
9
10
10
ANALOG
FIELD 2
308
308
309
309
310
310
311
311
312
313
314
315
316
317
318
318
319
319
320
320
321
321
322
322
323
323
ANALOG
FIELD 3
620
620
621
621
622
622
623
623
624
625
1
2
3
4
5
6
6
7
7
8
8
9
9
10
10
ANALOG
FIELD 4
308
308
309
309
310
310
BU
UR
RS
ST
T
B
BL
LA
AN
NK
KIIN
NG
G
B
INTERVALS
311
311
312
313
314
315
316
317
318
318
319
319
320
320
321
321
322
322
323
323
4
°°RE
BU
UR
RS
ST
TP
PH
HA
AS
SE
E=
=R
RE
EF
FE
ER
RE
EN
NC
CE
EP
P3H
HA
AS
SE
B
E=
=1
13
35
5 R
EL
LA
AT
TIIV
VE
ET
TO
OU
U
PA
AL
LS
SW
WIIT
TC
CH
H=
=0
0,, +
+V
VC
CO
OM
MP
PO
ON
NE
EN
N
P
T
2T
1H
°° E
BU
UR
RS
ST
TP
PH
HA
AS
SE
E=
=R
RE
EF
FE
ER
RE
EN
B
NC
CE
EP
P
HA
AS
SE
E+
+9
90
0 °°=
=2
22
25
5R
R
EL
LA
AT
TIIV
VE
ET
TO
OU
U
PA
AL
LS
SW
WIIT
TC
CH
H=
=1
1,, --V
VC
CO
OM
MP
PO
ON
NE
EN
P
NT
T
Figure 12: Interlaced PAL Video Timing
201-0000-024 Rev 2.1, 8/2/99
21
CHRONTEL
CH7004C
White
Yellow
26.66
24.66
1.000
0.925
Cyan
Green
21.37
19.37
0.801
0.726
Magenta
Red
16.22
14.22
0.608
0.533
Blue
Black
Blank
11.08
9.08
7.65
0.415
0.340
0.287
Sync
0.00
0.000
Color bars:
Black
Blue
Red
Magenta
V
Green
Cyan
Yellow
mA
White
Color/Level
Figure 13: NTSC Y (Luminance) Output Waveform (DACG = 0)
26.75
24.62
1.003
0.923
Cyan
Green
21.11
18.98
0.792
0.712
Magenta
Red
15.62
13.49
0.586
0.506
Blue
10.14
0.380
Blank/ Black
8.00
0.300
Sync
0.00
0.000
Black
White
Yellow
Color bars:
Blue
Red
Magenta
V
Green
Cyan
Yellow
mA
White
Color/Level
Figure 14: PAL Y (Luminance) Video Output Waveform (DACG = 1)
22
201-0000-024 Rev 2.1, 8/2/99
CHRONTEL
CH7004C
0.842
Peak Burst
18.08
0.678
Blank
14.29
0.536
Peak Burst
10.51
0.394
Black
22.44
Blue
Yellow/Blue
Red
0.968
0.938
Magenta
25.80
25.01
Green
Cyan/Red
Green/Magenta
Cyan
V
White
mA
Yellow
Color bars:
Color/Level
3.579545 MHz Color Burst
(9 cycles)
Yellow/Blue
6.15
0.230
Green/Magenta
Cyan/Red
3.57
2.79
0.134
0.105
Figure 15: NTSC C (Chrominance) Video Output Waveform (DACG = 0)
0.897
Peak Burst
19.21
0.720
Blank
15.24
0.572
Peak Burst
11.28
0.423
Black
23.93
Blue
Yellow/Blue
Red
1.032
1.000
Magenta
27.51
26.68
Green
Cyan/Red
Green/Magenta
Cyan
V
Yellow
mA
White
Color bars:
Color/Level
4.433619 MHz Color Burst
(10 cycles)
Yellow/Blue
6.56
0.246
Green/Magenta
Cyan/Red
3.81
2.97
0.143
0.111
Figure 16: PAL C (Chrominance) Video Output Waveform (DACG = 1)
201-0000-024 Rev 2.1, 8/2/99
23
CHRONTEL
CH7004C
11.44
0.429
Black
9.08
0.340
Blank
7.65
0.281
Peak Burst
4.45
0.145
Black
Peak Burst
Blue
1.000
Red
26.66
Magenta
White
Color bars:
Green
1.233
Cyan
V
32.88
Yellow
mA
Peak Chrome
White
Color/Level
3.579545 MHz Color Burst
(9 cycles)
Sync
0.00
0.000
Figure 17: Composite NTSC Video Output Waveform (DACG = 0)
8.00
0.300
Peak Burst
4.04
0.151
Sync
0.00
Black
Blank/Black
Blue
11.97
Red
Peak Burst
Magenta
1.003
26.75
Green
White
Color bars:
Cyan
V
1.249
White
mA
Peak Chrome 33.31
Yellow
Color/Level
0.449
0.000
4.433619 MHz Color Burst
(10 cycles)
Figure 18: Composite PAL Video Output Waveform (DACG = 1)
24
201-0000-024 Rev 2.1, 8/2/99
CHRONTEL
CH7004C
I2C Port Operation
The CH7004 contains a standard I2C control port, through which the control registers can be written and read. This
port is comprised of a two-wire serial interface, pins SD (bi-directional) and SC, which can be connected directly to
the SDB and SCB buses as shown in Figure 19.
The Serial Clock line (SC) is input only and is driven by the output buffer of the master device (also shown in
Figure 19). The CH7004 acts as a slave, and generation of clock signals on the bus is always the responsibility of
the master device. When the bus is free, both lines are HIGH. The output stages of devices connected to the bus
must have an open-drain or open-collector to perform the wired-AND function. Data on the bus can be transferred
up to 400 kbit/s.
+VDD
RP
SDB (Serial Data Bus)
SCB (Serial Clock Bus)
SD
SC
DATAN2
OUT
MASTER
SCLK
OUT
FROM
MASTER
DATA IN
MASTER
BUS MASTER
DATAN2
OUT
SCLK
IN1
DATA
IN1
DATAN2
OUT
SCLK
IN2
SLAVE
DATA
IN2
SLAVE
Figure 19: Connection of Devices to the Bus
Electrical Characteristics for Bus Devices
The electrical specifications of the bus devices’ inputs and outputs and the characteristics of the bus lines connected
to them are shown in Figure 19. A pull-up resistor (RP) must be connected to a 5V ± 10% supply. The CH7004 is a
device with input levels related to VDD.
Maximum and minimum values of pull-up resistor (R P)
The value of RP depends on the following parameters:
• Supply voltage
• Bus capacitance
• Number of devices connected (input current + leakage current = Iinput)
The supply voltage limits the minimum value of resistor R P due to the specified minimum sink current of 3mA at
VOLmax = 0.4 V for the output stages:
RP >= (VDD – 0.4) / 3 (RP in kΩ)
The bus capacitance is the total capacitance of wire, connections and pins. This capacitance limits the maximum
value of RP due to the specified rise time. The equation for RP is shown below:
RP <= 103/C (where: RP is in kΩ and C, the total capacitance, is in pF)
The maximum HIGH level input current of each input/output connection has a specified maximum value of 10 µA.
Due to the desired noise margin of 0.2VDD for the HIGH level, this input current limits the maximum value of R P.
The RP limit depends on VDD and is shown below:
RP <= (100 x VDD)/ Iinput (where: RP is in kΩ and Iinput is in µA)
201-0000-024 Rev 2.1, 8/2/99
25
CHRONTEL
CH7004C
Transfer Protocol
Both read and write cycles can be executed in “Alternating” and “Auto-increment” modes. Alternating mode
expects a register address prior to each read or write from that location (i.e., transfers alternate between address and
data). Auto-increment mode allows you to establish the initial register location, then automatically increments the
register address after each subsequent data access (i.e., transfers will be address, data, data, data...). A basic serial
port transfer protocol is shown in Figure 20 and described below.
SD
I2C
CH7
8
Device ID
R/W*
SC
Start
Condition
9
1-8
ACK
Data1
CH7004
acknowledge
9
1-8
ACK
Data n
CH7004
acknowledge
9
ACK
CH7004
acknowledge
Stop
Condition
Figure 20: Serial Port Transfer Protocol
1. The transfer sequence is initiated when a high-to-low transition of SD occurs while SC is high; this is the
“START” condition. Transitions of address and data bits can only occur while SC is low.
2. The transfer sequence is terminated when a low-to-high transition of SD occurs while SC is high; this is the
“STOP” condition.
3. Upon receiving the first START condition, the CH7004 expects a Device Address Byte (DAB) from the
master device. The value of the device address is shown in the DAB data format below.
4. After the DAB is received, the CH7004 expects a Register Address Byte (RAB) from the master. The
format of the RAB is shown in the RAB data format below (note that B7 is not used).
Device Address Byte (DAB)
B7
B6
B5
B4
B3
B2
B1
B0
1
1
1
0
1
ADDR*
ADDR
R/W
R/W
Read/Write Indicator
“0”:
master device will write to the CH7004 at the register location specified by the address
AR[5:0]
“1”:
master device will read from the CH7004 at the register location specified by the
address AR[5:0].
Register Address Byte (RAB)
26
B7
B6
B5
B4
B3
B2
B1
B0
1
AutoInc
AR[5]
AR[4]
AR[3]
AR[2]
AR[1]
AR[0]
201-0000-024 Rev 2.1, 8/2/99
CHRONTEL
CH7004C
Transfer Protocols (continued)
AutoInc
Register Address Auto-Increment - to facilitate sequential R/W of registers.
“1”:
Auto-Increment enabled (auto-increment mode).
Write: After writing data into a register, the Address Register will automatically be
incremented by one.
Read: Before loading data from a register to the on-chip temporary register (getting ready to
be serially read), the Address Register will automatically be incremented by one.
However, for the first read after an RAB, the Address Register will not be changed.
“0”:
Auto-Increment disabled (alternating mode).
Write: After writing data into a register, the Address Register will remain unchanged until a
new RAB is written.
Read: Before loading data from a register to the on-chip temporary register (getting ready to
be serially read), the Address Register will remain unchanged.
AR[5:0]
Specifies the Address of the Register to be Accessed.
This register address is loaded into the Address Register of the CH7004. The R/W access, which
follows, is directed to the register specified by the content stored in the Address Register.
The following two sections describe the operation of the serial interface for the four combinations of R/W = 0,1 and
AutoInc = 0,1.
CH7004 Write Cycle Protocols (R/W = 0)
Data transfer with acknowledge is required. The acknowledge-related clock pulse is generated by the mastertransmitter. The master-transmitter releases the SD line (HIGH) during the acknowledge clock pulse. The slavereceiver must pull down the SD line, during the acknowledge clock pulse, so that it remains stable LOW during the
HIGH period of the clock pulse. The CH7004 always acknowledges for writes (see Figure 21). Note that the
resultant state on SD is the wired-AND of data outputs from the transmitter and receiver.
SD Data Output
By Master-Transmitter
not acknowledge
SD Data Output
By the CH7004
SC from
Master
acknowledge
1
2
Start
Condition
8
9
clock pulse for
acknowledgement
Figure 21: Acknowledge on the Bus
Figure 22 shows two consecutive alternating write cycles for AutoInc = 0 and R/W = 0. The byte of information,
following the Register Address Byte (RAB), is the data to be written into the register specified by AR[5:0]. If
AutoInc = 0, then another RAB is expected from the master device, followed by another data byte, and so on.
201-0000-024 Rev 2.1, 8/2/99
27
CHRONTEL
CH7004C
CH7004
acknowledge
SD
CH7004
acknowledge
CH7004
acknowledge
CH7004
acknowledge
CH7004
acknowledge
I2C
SC
Start
Condition
1-7
8
9
1-8
9
1-8
9
1-8
9
1-8
9
Device ID
R/W*
ACK
RAB
ACK
Data
ACK
RAB
ACK
Data
ACK
Stop
Condition
Note: The acknowledge is from the CH7004 (slave).
Figure 22: Alternating Write Cycles
If AutoInc = 1, then the register address pointer will be incremented automatically and subsequent data bytes will be
written into successive registers without providing an RAB between each data byte. An Auto-increment write cycle
is shown in Figure 23.
CH7004
acknowledge
SD
CH7004
acknowledge
CH7004
acknowledge
CH7004
acknowledge
I2C
SC
Start
Condition
1-7
8
9
1-8
9
1-8
9
1-8
9
Device ID
R/W*
ACK
RAB n
ACK
Data n
ACK
Data n+1
ACK
Stop
Condition
Note: The acknowledge is from the CH7004 (slave).
Figure 23: Auto-Increment Write Cycle
When the auto-increment mode is enabled (AutoInc is set to 1), the register address pointer continues to increment
for each write cycle until AR[5:0] = 3F (3F is the address of the Address Register). The next byte of information
represents a new auto-sequencing “Starting address,” which is the address of the register to receive the next byte.
The auto-sequencing then resumes based on this new “Starting address.” The auto-increment sequence can be
terminated any time by either a “STOP” or “RESTART” condition. The write operation can be terminated with a
“STOP” condition.
CH7004 Read Cycle Protocols (R/W = 1)
If a master-receiver is involved in a transfer, it must signal the end of data to the slave-transmitter by not generating
an acknowledge on the last byte that was clocked out of the slave. The slave-transmitter CH7004 releases the data
line to allow the master to generate the STOP condition or the RESTART condition.
To read the content of the registers, the master device starts by issuing a “START” condition (or a “RESTART”
condition). The first byte of data, after the START condition, is a DAB with R/W = 0. The second byte is the RAB
with AR[5:0], containing the address of the register that the master device intends to read from in AR[5:0]. The
master device should then issue a “RESTART” condition (“RESTART” = “START,” without a previous “STOP”
condition). The first byte of data, after this RESTART condition, is another DAB with R/W=1, indicating the
master’s intention to read data hereafter. The master then reads the next byte of data (the content of the register
specified in the RAB). If AutoInc = 0, then another RESTART condition, followed by another DAB with R/W = 0
and RAB, is expected from the master device. The master device then issues another RESTART, followed by
another DAB. After that, the master may read another data byte, and so on. In summary, a RESTART condition,
followed by a DAB, must be produced by the master before each of the RAB, and before each of the data read
events. Two consecutive alternating read cycles are shown in Figure 24.
28
201-0000-024 Rev 2.1, 8/2/99
CHRONTEL
CH7004C
Transfer Protocols (continued)
.
CH7004
acknowledge
CH7004
acknowledge
CH7004
acknowledge
Master
does not
acknowledge
SD
I 2C
1-7
SC
Start
Condition
I2 C
9
1-8
9
ACK
RAB 1
ACK
8
Device ID R/W*
10
Restart
Condition
1-7
Device ID R/W*
DeviceID
9
ACK
Data 1
ACK
10
Restart
Condition
CH7004
acknowledge
I2C
I2C
8
9
1-8
9
R/W*
ACK
RAB 2
ACK
1-7
1-8
Master does
not acknowledge
CH7004
acknowledge
CH7004
acknowledge
9
8
10
1-7
Restart DeviceID
Condition
8
9
1-8
9
R/W*
ACK
Data 2
ACK
Stop
Condition
Figure 24: Alternating Read Cycle
If AutoInc = 1, then the address register will be incremented automatically and subsequent data bytes can be read
from successive registers, without providing a second RAB
CH7004
acknowledge
CH7004
acknowledge
CH7004
acknowledge
Master
acknowledge
Master does
not acknowledge
just before Stop
condition
SD
I2C
SC
1-7
8
Start Device ID R/W*
Condition
I2 C
9
1-8
9
ACK
RAB n
ACK
10
1-7
8
Restart Device ID R/W*
Condition
9
1-8
9
1-8
9
ACK
Data n
ACK
Data
n+1
ACK
Stop
Condition
Figure 25: Auto-increment Read Cycle
When the auto-increment mode is enabled (AutoInc is set to 1), the Address Register will continue incrementing for
each read cycle. When the content of the Address Register reaches 2A, it will wrap around and start from 00h again.
The auto increment sequence can be terminated by either a “STOP” or “RESTART” condition. The read operation
can be terminated with a “STOP” condition. Figure 25 shows an auto-increment read cycle terminated by a STOP or
RESTART condition.
201-0000-024 Rev 2.1, 8/2/99
29
CHRONTEL
CH7004C
Registers and Programming
The CH7004 is a fully programmable device, providing for full functional control through a set of registers accessed
from the I2C port. The CH7004 contains a total of 37 registers, which are listed in Table 15 and described in detail
under Register Descriptions. Detailed descriptions of operating modes and their effects are contained in the previous
section, Functional Description. An addition (+) sign in the Bits column below signifies that the parameter contains
more than 8 bits, and the remaining bits are located in another register.
Table 15. Register Map
Symbol
Address
Display Mode
Register
DMR
00H
8
Bits
Display mode selection
Flicker Filter
FFR
01H
6
Flicker filter mode selection
Video Bandwidth
VBW
03H
7
Luma and chroma filter bandwidth selection
Input Data Format
IDF
04H
7
Data format and bit-width selections
Clock Mode
CM
06H
8
Sets the clock mode to be used
Start Active Video
SAV
07H
8+
Active video delay setting
Position Overflow
PO
08H
3
MSB bits of position values
Black Level
BLR
09H
8
Black level adjustment input latch clock edge select
HPR
0AH
8+
Enables horizontal movement of displayed image on
TV
Vertical Position
VPR
0BH
8+
Enables vertical movement of displayed image on
TV
Sync Polarity
SPR
0DH
4
Determines the horizontal and vertical sync polarity
Power Management
PMR
0EH
5
Enables power saving modes
Connection Detect
CDR
10H
4
Detection of TV presence
Contrast Enhancement
CE
11H
3
Contrast enhancement setting
PLL M and N extra bits
MNE
13H
5
Contains the MSB bits for the M and N PLL values
PLL-M Value
PLLM
14H
8+
Sets the PLL M value - bits (7:0)
PLL-N Value
PLLN
15H
8+
Sets the PLL N value - bits (7:0)
Buffered Clock
BCO
17H
6
Determines the clock output at pin 41
Subcarrier Frequency
Adjust
FSCI
18H -1FH
4 or 8
each
Determines the subcarrier frequency
PLL and Memory Control
PLLC
20H
6
Controls for the PLL and memory sections
CIV Control
CIVC
21H
5
Control of CIV value
Calculated Fsc Increment
Value
CIV
22H - 24H
8 each
Readable register containing the calculated
subcarrier increment value
Version ID
VID
25H
8
Device version number
Test
TR
26H - 29H
30
Reserved for test (details not included herein)
Address
AR
3FH
6
Current register being addressed
Horizontal Position
30
Functional Summary
201-0000-024 Rev 2.1, 8/2/99
CHRONTEL
CH7004C
Register Descriptions (continued)
Table 16. I2C Alternate Register Map (Note: MacrovisionTM controls available only by special arrangement)
Register
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
00H
IR2
IR1
IRO
VOS1
VOS0
SR2
SR1
SR0
FC1
FC0
FY1
FY0
FT1
FT0
CVBW
CBW1
CBW0
YPEAK
YSV1
YSV0
YCV
DACG
RGBBP
IDF3
IDF2
IDF1
IDF0
01H
02H
03H
FLFF
04H
05H
06H
CFRB
M/S*
Reserved
MCP
XCM1
XCM0
PCM1
PCM0
07H
SAV7
SAV6
SAV5
SAV4
SAV3
SAV2
SAV1
SAV0
SAV8
HP8
VP8
08H
09H
BL7
BL6
BL5
BL4
BL3
BL2
BL1
BL0
0AH
HP7
HP6
HP5
HP4
HP3
HP2
HP1
HP0
0BH
VP7
VP6
VP5
VP4
VP3
VP2
VP1
VP0
DES
SYO
VSP
HSP
Reset*
PD2
PD1
PD0
YT
CT
CVBST
SENSE
CE2
CE1
CE0
0CH
0DH
0EH
SCART
0FH
10H
11H
12H
13H
Reserved
Reserved
N9
N8
M8
14H
M7
M6
M5
M4
M3
M2
M1
M0
15H
N7
N6
N5
N4
N3
N2
N1
N0
SHF2
SHF1
16H
17H
SHF0
SCO2
SCO1
SCO0
18H
FSCI31
FSCI30
FSCI29
FSCI28
19H
FSCI27
FSCI26
FSCI25
FSCI24
1AH
FSCI23
FSCI22
FSCI21
FSCI20
1BH
GPIOIN3
GPIOIN2
GPIOIN1
GPIOIN0
FSCI19
FSCl18
FSCl17
FSCl16
1CH
GOENB3
GOENB2
GOENB1
GOENB0
FSCI15
FSCl14
FSCl13
FSCI12
1DH
FSCI11
FSCl10
FSCl9
FSCI8
1EH
FSCI7
FSCI6
FSCI5
FSCI4
1FH
20H
PLLCPl
21H
FSCI3
FSCI2
FSCI1
FSCI0
PLLCAP
PLLS
PLL5VD
PLL5VA
MEM5V
CIV25
CIV24
ClVH1
ClVH0
AClV
22H
CIV23
CIV22
CIV21
CIV20
CIV19
CIV18
CIV17
CIV16
23H
CIV15
CIV14
CIV13
CIV12
CIV11
CIV10
CIV9
CIV8
24H
CIV7
CIV6
CIV5
CIV4
CIV3
CIV2
CIV1
CIVO
25H
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
26H
TS3
TS2
TS1
TS0
RSA
BST
NST
TE
MS2
MS1
MSO
MTD
YLM8
CLM8
28H
YLM7
YLM6
YLM5
YLM4
YLM3
YLM2
YLM1
YLM0
29H
CLM7
CLM6
CLM5
CLM4
CLM3
CLM2
CLM1
CLM0
3FH
Reserved
Reserved
AR5
AR4
AR3
AR2
AR1
AR0
27H
201-0000-024 Rev 2.1, 8/2/99
31
CHRONTEL
CH7004C
Register Descriptions (continued)
Display Mode Register
Address: 00H
Bits: 8
Bit:
7
6
5
4
3
2
1
0
Symbol:
IR2
IR1
IR0
VOS1
VOS0
SR2
SR1
SR0
Type:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default:
0
1
1
0
1
0
1
0
This register provides programmable control of the CH7004 display mode, including input resolution (IR[2:0]),
output TV standard (VOS[1:0]), and scaling ratio (SR[2:0]). The mode of operation is determined according to the
table below (default is 640x480 input, NTSC output, 7/8’s scaling).
Table 17. Display Modes
Mode
IR[20:]
VOS
[1:0]
SR
[2:0]
Input Data
Format
(Active
Video)
Total
Pixels/Line
x Total
Lines/Frame
Output
Format
Scaling
Pixel Clock
(MHz)
0
000
00
000
512x384
840x500
PAL
5/4
21.000000
1
000
00
001
512x384
840x625
PAL
1/1
26.250000
2
000
01
000
512x384
800x420
NTSC
5/4
20.139860
3
000
01
001
512x384
784x525
NTSC
1/1
24.671329
4
001
00
000
720X400
1125X500
PAL
5/4
28.125000
5
001
00
001
720x400
1116x625
PAL
1/1
34.875000
6
001
01
000
720x400
945x420
NTSC
5/4
23.790210
7
001
01
001
720x400
936x525
NTSC
1/1
29.454545
8
010
00
010
640x400
1000x500
PAL
5/4
25.000000
9
010
00
001
640x400
1008x625
PAL
1/1
31.5000000
10
010
01
000
640x400
840x420
NTSC
5/4
21.146853
11
010
01
001
640x400
840x525
NTSC
1/1
26.433566
12
010
01
010
640x400
840x600
NTSC
7/8
30.209790
13
011
00
000
640x480
840x500
PAL
5/4
21.000000
14
011
00
001
640x480
840x625
PAL
1/1
26.250000
15
011
00
011
640x480
840x750
PAL
5/6
31.5000000
16
011
01
001
640x480
784x525
NTSC
1/1
24.671329
17
011
01
010
640x480
784x600
NTSC
7/8
28.195804
18
011
01
011
640x480
800x630
NTSC
5/6
30.209790
19
100
00
001
800x600
944x625
PAL
1/1
29.500000
20
100
00
011
800x600
960x750
PAL
5/6
36.0000000
21
100
00
100
800x600
936x836
PAL
3/4
39.000000
22
100
01
011
800x600
1040x630
NTSC
5/6
39.272727
23
100
01
100
800x600
1040x700
NTSC
3/4
43.636364
24
100
01
101
800x600
1064x750
NTSC
7/10
47.832168
25*
101
00
001
720x576
864x625
PAL
1/1
13.500000
26*
101
01
001
720x480
858x525
NTSC
1/1
13.500000
27*
110
00
001
800x500
1135x625
PAL
1/1
17.734375
28*
110
01
001
640X400
910X525
NTSC
1/1
14.318182
* Interlaced modes of operation. (For those modes, some functions will be bypassed. For details, please contact the
application department.)
32
201-0000-024 Rev 2.1, 8/2/99
CHRONTEL
CH7004C
Register Descriptions (continued)
VOS[1:0]
00
01
10
11
Output Format
PAL
NTSC
PAL-M
NTSC-J
Flicker Filter Register
Bit:
7
Symbol: FFR
Address: 01H
Bits: 6
6
5
4
3
2
1
0
Symbol:
FC1
FC0
FY1
FY0
FT1
FT0
Type:
R/W
R/W
R/W
R/W
R/W
R/W
Default:
1
1
0
0
1
0
The flicker filter register provides for adjusting the operation of the various filters used in rendering the on-screen
image. Adjusting settings between minimal and maximal values enables optimization between sharpness and flicker
content. The FC[1:0] bits determine the settings for the chroma channel. The FT[1:0] bits determine the settings for
the text enhancement circuit. The FY[1:0] bits determine the settings for the luma channel. In addition, the Chroma
channel filtering includes a setting to enable the chroma dot crawl reduction circuit.
Note: When writing to register O1H, FY[1:0] is bits 3:2. FT[1:0] is bits 1:0. When reading from the register O1H, FY
[1:0] is bits 1:0 and FT[1:0] is bits 3:2.
Table 18.Flicker Filter Settings
FY[1:0]
Settings for Luma Channel
00
Minimal Flicker Filtering
01
Slight Flicker Filtering
10
Maximum Flicker Filtering
11
Invalid
FT[1:0]
Settings for Text Enhancement Circuit
00
Maximum Text Enhancement
01
Slight Text Enhancement
10
Minimum Text Enhancement
11
Invalid
FC[1:0]
Settings for Chroma Channel
00
Minimal Flicker Filtering
01
Slight Flicker Filtering
10
Maximum Flicker Filtering
11
Enable Chroma DotCrawl Reduction
201-0000-024 Rev 2.1, 8/2/99
33
CHRONTEL
CH7004C
Register Descriptions (continued)
Video Bandwidth Register
Symbol: VBW
Address: 03H
Bits: 7
Bit:
7
6
5
4
3
2
1
0
Symbol:
FLFF
CVBW
CBW1
CBW0
YPEAK
YSV1
YSV0
YCV
Type:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default:
0
0
0
0
0
0
0
0
This register enables the selection of alternative filters for use in the luma and chroma channels. There are currently
four filter options defined for the chroma channel, 4 filter options in the S-Video luma channel and two filter options
in the composite luma channel. The Table 19 and Table 20 below show the various settings.
Table 19. Luma Filter Bandwidth
YCV
Luma Composite Video Filter Adjust
0
Low bandwidth
1
High bandwidth
YSV[1:0]
Luma S-Video Filter Adjust
00
Low bandwidth
01
Medium bandwidth
10
High bandwidth
11
Reserved (decode this and handle the same as 10)
YPEAK
Disables the Y-peaking circuit
0
Disables the peaking filter in luma S-Video channel
1
Enables the peaking filter in luma S-Video channel
Table 20. Chroma Filter Bandwidth
CBW[1:0]
Luma Composite Video Filter Adjust
00
Low bandwidth
01
Medium bandwidth
10
Med-high bandwidth
11
High bandwidth
Bit 6 (CVBW) outputs the S-Video luma signal on both the S-Video luma output and the CVBS output. A "1" in this
location enables the output of a black and white image on composite, thereby eliminating the degrading effects of
the color signal (such as dot crawl or false colors), which is useful for viewing text with high accuracy.
Bit 7 (FLFF) controls the flicker filter used in the 7/10’s scaling modes. In these scaling modes, setting FLFF to 1
causes a five line flicker filter to be used. The default setting of 0 uses a four line flicker filter.
34
201-0000-024 Rev 2.1, 8/2/99
CHRONTEL
CH7004C
Register Descriptions (continued)
Input Data Format Register
Bit:
7
Symbol: IDF
Address: 04H
Bits: 7
6
5
3
2
1
0
Symbol:
DACG
RGBBP
4
IDF3
IDF2
IDF1
IDF0
Type:
R/W
R/W
R/W
R/W
R/W
R/W
Default:
0
0
0
0
0
0
This register sets the variables required to define the incoming pixel data stream.
Table 21. Input Data Format
IDF[3:0]
Description
0000
16-bit non-multiplexed RGB (16-bit color, 565) input
0001
16-bit non-multiplexed YCrCb (24-bit color) input (Y non-multiplexed, CrCb multiplexed
0010
16-bit multiplexed RGB (24-bit color) input
0011
15-bit non-multiplexed RGB (15-bit color, 555) input
0100
12-bit multiplexed RGB (24-bit color) input (“C” multiplex scheme)
0101
12-bit multiplexed RGB2 (24-bit color) input (“I” multiplex scheme)
0110
8-bit multiplexed RGB (24-bit color, 888) input
0111
8-bit multiplexed RGB (16-bit color, 565) input
1000
8-bit multiplexed RGB (15-bit color, 555) input
1001-1111
8-bit multiplexed YCrCb (24-bit color) input (Y, Cr and Cb are multiplexed)
RGBBP (bit 5): Setting this bit enables the RGB pass-through mode. Setting this bit to a 1 causes the input RGB
signal to be directly output at the DACs (subject to a pipeline delay). If RGBBP=0, the bypass mode is disabled.
DACG (bit 6): This bit controls the gain of the D/A converters. When DACG=0, the nominal DAC current is 71
µA, which provides the correct levels for NTSC and PAL-M. When DACG=1, the nominal DAC current is 76µA,
which provides the correct levels for PAL and NTSC-J.
Clock Mode Register
Symbol: CM
Address: 06H
Bits: 8
Bit:
7
6
5
4
3
2
1
0
Symbol:
CFRB
M/S*
Reserved
MCP
XCM1
XCM0
PCM1
PCM0
Type:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default:
0
0
0
1
0
0
0
0
The setting of the clock mode bits determines the clocking mechanism used in the CH7004. The clock modes are
shown in the table below. PCM controls the frequency of the pixel clock, and XCM identifies the frequency of the
XCLK input clock.
201-0000-024 Rev 2.1, 8/2/99
35
CHRONTEL
CH7004C
Register Descriptions (continued)
Note: For what was formerly defined as the master mode, the user must now externally connect the P-OUT clock to the
XCLK input pin. Although it is possible to set the XCM [1:0] and PCM[1:0] values independent of the input data format,
there are only certain combinations of inpu data format, XCM and PCM, that will result in valid data being demultiplexed
at the input of the device. Refer to the “Input Data Format Register” for these combinations.
Note: Display modes 25 and 26 must use a 2X multiplexed input data format and a 2X XCLK. Display modes 27
and 28 must use a 1X XCLK input data format.
Table 22. Input Data Format Register
XCM[1:0]
PCM[1:0]
XCLK
P-OUT
Input Data Modes Supported
00
00
1X
1X
0, 1, 2, 3, 4, 5, 7, 8, 9
00
01
1X
2X
0, 1, 2, 3, 4, 5, 7, 8, 9
00
1X
1X
3X
0, 1, 2, 3, 4, 5, 7, 8, 9
01
00
2X
1X
2, 4, 5, 7, 8, 9
01
01
2X
2X
2, 4, 5, 7, 8, 9
01
1X
2X
3X
2, 4, 5, 7, 8, 9
1X
00
3X
1X
6
1X
01
3X
2X
6
1X
1X
3X
3X
6
The Clock Mode Register also contains the following bits:
•
•
•
MCP (bit 4) determines which edge of the pixel clock output will be used to latch input data. Zero selects the
negative edge, one selects the positive edge.
M/S* (bit 6) determines whether the device operates in master or slave clock mode. In master mode (1), the
14.31818MHz clock is used as a frequency reference to the PLL . In slave mode (0) the XCLK input is used
as a reference to the PLL, and is divided by the value specified by XCM[1:0]. The divide by N and M are
forced to one.
CFRB (bit 7) sets whether the chroma subcarrier free-runs, or is locked to the video signal. One causes the
subcarrier to lock to the TV vertical rate, and should be used when the ACIV bit is set to zero. Zero causes the
subcarrier to free-run, and should be used when the ACIV bit is set to one.
Start Active Video Register
Symbol: SAV
Address: 07H
Bits: 8
Bit:
7
6
5
4
3
2
1
0
Symbol:
SAV7
SAV6
SAV5
SAV4
SAV3
SAV2
SAV1
SAV0
Type:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default:
0
0
0
0
0
0
0
0
This register sets the delay, in pixel increments, from leading edge of horizontal sync to start of active video. The
entire bit field SAV[8:0] is comprised of this register SAV[7:0], plus the MSB value contained in the position
overflow register, bit SAV8. This is decoded as a whole number of pixels, which can be set anywhere between 0 and
511 pixels. Therefore, in any 2X clock mode, the number of 2X clocks from the leading edge of sync to the first
active data must be a multiple of two clocks. In any 3X clock mode, the number of 3X clocks from the leading edge
of sync to the first active data must be a multiple of three clocks.
36
201-0000-024 Rev 2.1, 8/2/99
CHRONTEL
CH7004C
Register Descriptions (continued)
Position Overflow Register
Bit:
7
6
Symbol: PO
Address: 08H
Bits: 3
2
1
0
Symbol:
5
4
3
SAV8
HP8
VP8
Type:
R/W
R/W
R/W
Default:
0
0
0
This position overflow register contains the MSB values for the SAV, HP, and VP values, as follows:
•
VP8 (bit 0) is the MSB of the vertical position value (see explanation under “Vertical Position Register”).
•
HP8 (bit 1) is the MSB of the horizontal position value (see explanation under “Horizontal Position
Register”).
SAV8 (bit 2) is the MSB of the start of active video value (see explanation under “Start Active Video
Register”).
•
Black Level Register
Symbol: BLR
Address: 09H
Bits: 8
Bit:
7
6
5
4
3
2
1
0
Symbol:
BL7
BL6
BL5
BL4
BL3
BL2
BL1
BL0
Type:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default:
0
1
1
1
1
1
1
1
This register sets the black level. The luminance data is added to this black level, which must be set between 90 and
208, with the default value being 127. Recommended values for NTSC and PAL-M are 127, 105 for PAL and 100
for NTSC-J.
Horizontal Position Register
Symbol: HPR
Address: 0AH
Bits: 8
Bit:
7
6
5
4
3
2
1
0
Symbol:
HP7
HP6
HP5
HP4
HP3
HP2
HP1
HP0
Type:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default:
0
0
0
0
0
0
0
0
The horizontal position register is used to shift the displayed TV image in a horizontal direction (left or right) to
achieve a horizontally centered image on screen. The entire bit field, HP[8:0] is comprised of this register HP[7:0]
plus the MSB value contained in the position overflow register, bit HP8. Increasing this value moves the displayed
image position RIGHT; decreasing this value moves the displayed image position LEFT. Each increment moves the
image position by 4 input pixels.
201-0000-024 Rev 2.1, 8/2/99
37
CHRONTEL
CH7004C
Register Descriptions (continued)
Vertical Position Register
Symbol: VPR
Address: 0BH
Bits: 8
Bit:
7
6
5
4
3
2
1
0
Symbol:
VP7
VP6
VP5
VP4
VP3
VP2
VP1
VP0
Type:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default:
0
0
0
0
0
0
0
0
This register is used to shift the displayed TV image in a vertical direction (up or down) to achieve a vertically centered image on screen. This bit field, VP[8:0] represents the TV line number (relative to the VGA vertical sync)
used to initiate the generation and insertion of the TV vertical interval (i.e., the first sequence of equalizing pulses).
Increasing values delay the output of the TV vertical sync, causing the image position to move UP on the TV screen.
Decreasing values, therefore, move the image position DOWN. Each increment moves the image position by one
TV lines (approximately 4 input lines). The maximum value that should be programmed into the VP[8:0] value is
the number of TV lines minus one, divided by two (262, 312 or 313). When panning the image up, the number
should be increased until (TVLPF-1) /2 is reached; the next step should be to reset the register to zero. When panning the image down the screen, the VP[8:0] value should be decremented until the value zero is reached. The next
step should set the register to (TVLPF-1) /2, and then decrementing can continue. If this value is programmed to a
number greater than (TV lines per frame-1) /2, a TV vertical SYNC will not be generated.
Sync Polarity Register
Bit:
7
Symbol: SPR
Address: 0DH
Bits: 4
6
5
4
3
2
1
0
Symbol:
DES
SYO
VSP
HSP
Type:
R/W
R/W
R/W
R/W
Default:
0
0
0
0
This register provides selection of the synchronization signal input to, or output from, the CH7004.
• HSP (bit 0) is Horizontal Sync Polarity - an HSP value of zero means the horizontal sync is active low, and a
value of one means the horizontal sync is active high.
•
•
•
VSP (bit 1) is Vertical Sync Polarity - a VSP value of zero means the vertical sync is active low, and a value
of one means the vertical sync is active high.
SYO (bit 2) is Sync Direction - a SYO value of zero means that H and V sync are input to the CH7004. A
value of one means that H and V sync are output from the CH7004.
DES (bit 3) is Detect Embedded Sync - a DES value of zero means that H and V sync will be obtained from
the direct pin inputs. A DES value of one means that H and V sync will be detected from the embedded codes
on the pixel input stream. Note that this will only be valid for the YCrCb input modes.
Note: When sync direction is set to be an output, horizontal sync will use a fixed pulse width of 64 pixels and vertical
sync will use a fixed pulse width of 2 lines.
38
201-0000-024 Rev 2.1, 8/2/99
CHRONTEL
CH7004C
Register Descriptions (continued)
Power Management Register
Bit:
7
6
Symbol: PMR
Address: 0EH
Bits: 5
5
4
3
2
1
0
Symbol:
SCART
Reset*
PD2
PD1
PD0
Type:
R/W
R/W
R/W
R/W
R/W
Default:
0
1
0
1
1
This register provides control of the power management functions, a software reset (Reset*) and the SCART output
enable. The CH7004 provides programmable control of its operating states, as described in the table below.
Table 23. Power Management
PD[2:0]
Operating State
Functional Description
000
Composite Off
CVBS DAC is powered down
001
Power Down
Most pins and circuitry are disabled (except for the buffered clock outputs
which are limited to the 14MHz output and VCO divided outputs).
010
S-Video Off
S-Video DACs are powered down
011
Normal (On)
All circuits and pins are active.
1XX
Full Power Down
All circuitry is powered down, except I2C circuit
Reset* (bit 3) is soft reset. Setting this bit will reset all circuitry requiring a power on reset, except for this bit itself
and the I2C state machines.
SCART (bit 4) is the SCART enable. Setting SCART = 0 means the CH7004 will operate normally, outputting Y/C
and CVBS from the three DACs. SCART=1 enables SCART output, which will cause R, G and B to be output from
the DACs and composite sync from the CSYNC pin.
Note: For complete details regarding the operation of these modes, see the Power Management in Functional Description
sections.
Connection Detect Register
Bit:
7
6
Symbol: CDR
Address: 10H
Bits: 4
5
4
3
2
1
0
Symbol:
YT
CT
CVBST
SENSE
Type:
R
R
R
W
Default:
0
0
0
0
The Connection Detect Register provides a means to sense the connection of a TV to either S-Video or Composite
video outputs. The status bits, YT, CT, and CVBST correspond to the DAC outputs for S-Video (Y and C outputs)
and Composite video (CVBS), respectively. However, the values contained in these status bits are NOT VALID
until a sensing procedure is performed. Use of this register requires a sequence of events to enable the sensing of
outputs, then reading out the applicable status bits. The detection sequence works as follows:
1. Ensure the power management register Bits 2-0 are set to 011 (normal mode).
201-0000-024 Rev 2.1, 8/2/99
39
CHRONTEL
CH7004C
Register Descriptions (continued)
2. Set the SENSE bit to a 1. This forces a constant current output onto the Y, C, and CVBS outputs. Note that
during SENSE = 1, these 3 analog outputs are at steady state and no TV synchronization pulses are asserted.
3. Reset the SENSE bit to 0. This triggers a comparison between the voltage sensed on these analog outputs
and the reference value expected (Vthreshold = 1.235V). If the measured voltage is below this threshold
value, it is considered connected, if it is above this voltage it is considered unconnected. During this step,
each of the three status bits corresponding to individual analog outputs will be set if they are NOT
connected.
4. Read the status bits. The status bits, Y, C, and CVBST (corresponding to S-Video Y and C outputs and
composite video) now contain valid information which can be read to determine which outputs are
connected to a TV. Again, a “0” indicates a valid connection, a “1” indicates an unconnected output.
Contrast Enhancement Register
Bit:
7
6
Symbol: CE
Address: 11H
Bits: 3
5
4
3
2
1
0
CE2
CE1
CE0
Type:
R/W
R/W
R/W
Default:
0
1
1
Symbol:
This register provides control of the contrast enhancement feature of the CH7004, according to the table below. At a
setting of 000, the video signal will be pulled towards the maximum black level. As the value of CE[2:0] is
increased, the amount that the signal is pulled towards black is decreased until unity gain is reached at a setting of
011. From this point on, the video signal is pulled towards the white direction, with the effect increasing with
increasing settings of CE[2:0].
Table 24. Contrast Enhancement Function
CE[2:0]
Description (all gains limited to 0-255)
000
Contrast enhancement gain 3 Yout = (5/4)*(Yin-102) = Enhances Black
001
Contrast enhancement gain 2 Yout = (9/8)*(Yin-57)
010
Contrast enhancement gain 1 Yout = (17/16)*(Y in-30)
011
Normal mode Yout = (1/1)*(Yin-0) = Normal Contrast
100
Contrast enhancement gain 1 Yout = (17/16)*(Y in-0)
101
Contrast enhancement gain 2 Yout = (9/8)*(Yin-0)
110
Contrast enhancement gain 3 Yout = (5/4)*(Yin-0)
111
Contrast enhancement gain 4 Yout = (3/2)*(Yin-0) = Enhances White
40
201-0000-024 Rev 2.1, 8/2/99
CHRONTEL
CH7004C
Register Descriptions (continued)
256
224
192
160
128
96
64
32
0
0
32
64
96
128
160
192
224
256
Figure 26: Luma Transfer Function at different contrast enhancement settings
PLL Overflow Register
Bit:
7
6
Symbol: MNE
Address: 13H
Bits: 5
5
4
3
2
1
0
Symbol:
Reserved
Reserved
N9
N8
M8
Type:
R/W
R/W
R/W
R/W
R/W
Default:
0
0
0
0
0
The PLL Overflow Register contains the MSB bits for the ‘M’ and ‘N’ vlaues, which will be described in the PLLM and PLL-N registers, respectively. The reserved bits should not be written to.
PLL M Value Register
Symbol: PLLM
Address: 14H
Bits: 8
Bit:
7
6
5
4
3
2
1
0
Symbol:
M7
M6
M5
M4
M3
M2
M1
M0
Type:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default:
0
1
0
0
0
0
0
1
The PLL M value register determines the division factor applied to the frequency reference clock before it is input to
the PLL phase detector when the CH7004 is operating in master or pseudo-master clock mode. In slave mode, an
external pixel clock is used instead of the frequency reference, and the division factor is determined by the
XCM[3:0] value. This register contains the lower 8 bits of the complete 9-bit M value.
201-0000-024 Rev 2.1, 8/2/99
41
CHRONTEL
CH7004C
Register Descriptions (continued)
PLL N Value Register
Symbol: PLLN
Address: 15H
Bits: 8
Bit:
7
6
5
4
3
2
1
0
Symbol:
N7
N6
N5
N4
N3
N2
N1
N0
Type:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default:
1
0
0
0
0
0
0
0
The PLL N value register determines the division factor applied to the VCO output before being applied to the PLL phase
detector, when the CH7004 is operating in master or pseudo-master mode. In slave mode, the value of ‘N’ is always 1.
This register contains the lower 8 bits of the complete 10-bit N value. The pixel clock generated in a master and pseudomaster modes is calculated according to the equation below:
Fpixel = Fref* [(N+2) / (M+2)]
When using a 14.318 MHz frequency reference, the required M and N values for each mode are shown in the table
below.
Table 25. M and N Values for Each Mode
Mode
VGA Resolution, TV
Standard, Scaling Ratio
N 10bits
M 9bits
0
512x384, PAL, 5:4
20
1
512x384, PAL, 1:1
9
13
4
Mode
VGA Resolution, TV
Standard, Scaling Ratio
N 10bits
M 9bits
9
3
15
640X480, PAL, 5:6
16
640X480, NTSC, 1:1
110
63
17
640X480, NTSC, 7:8
126
63
2
512X384, NTSC, 5:4
126
89
3
512X384, NTSC, 1:1
110
63
18
640X480, NTSC, 5:6
190
89
19
800X600, PAL, 1:1
647
313
4
720X400, PAL, 5:4
53
26
5
720X400, PAL, 1:1
339
138
20
800X600, PAL, 5:6
86
33
6
720X400, NTSC, 5:4
106
63
21
800X600, PAL, 3:4
284
103
22
800X600, NTSC, 5:6
94
33
7
720X400, NTSC, 1:1
70
33
8
640X400, PAL, 5:4
108
61
23
800X600, NTSC, 3:4
62
19
24
800X600, NTSC, 7:10
302
89
31
33
9
640X400, PAL, 1:1
9
3
10
640X400, NTSC, 5:4
94
63
25
720X576, PAL, 1:1
11
640x400, NTSC, 1:1
22
11
26
720X480, NTSC, 1:1
31
33
27
800X500, PAL, 1:1
242
197
28
640X400, NTSC, 1:1
2
2
12
640X400, NTSC, 7:8
190
89
13
640X480, PAL, 5:4
20
13
9
4
14
640X480, PAL, 1:1
Buffered Clock Output Register
Bit:
7
6
Symbol: BCO
Address: 17H
Bits: 6
5
4
3
2
1
0
Symbol:
SHF2
SHF1
SHF0
SCO2
SCO1
SCO0
Type:
R/W
R/W
R/W
R/W
R/W
R/W
Default:
0
0
0
0
0
0
The buffered clock output register determines which clock is selected to be output at the buffered clcok output pin,
and what frequency value should be output if a VCO derived signal is output. The tables below show the possible
outputs signals.
42
201-0000-024 Rev 2.1, 8/2/99
CHRONTEL
CH7004C
Register Descriptions (continued)
Table 26.Clock Output Selection
SCO[2:0]
Buffered Clock Output
000
14MHz crystal
001
(for test use only)
010
VCO divided by K3 (see Table 27)
011
Field ID signal
100
Sine ROM MSB (for test use only)
101
Cosine ROM MSB (for test use only)
110
TV horizontal sync (for test use only)
111
TV vertical sync (for test use only)
Table 27. K3 Selection
SHF[2:0]
K3
000
2.5
010
3.5
011
4
100
4.5
101
5
110
6
111
7
Sub-carrier Value Registers
Bit:
7
6
Symbol: FSCI
Address: 18H - 1FH
Bits: 4 or 8 each
5
4
3
2
1
0
Symbol:
FSCI#
FSCI#
FSCI#
FSCI#
Type:
R/W
R/W
R/W
R/W
Default:
The lower four bits of registers 18H through 1FH contain a 32-bit value which is used as an increment value for the
ROM address generation circuitry. The bit locations are specified as the following:
Register
18H
19H
1AH
1BH
1CH
1DH
1EH
1FH
Contents
FSCI[31:28]
FSCI[27:24]
FSCI[23:20]
FSCI[19:16]
FSCI[15:12]
FSCI[11:8]
FSCI[7:4]
FSCI[3:0]
201-0000-024 Rev 2.1, 8/2/99
43
CHRONTEL
CH7004C
Register Descriptions (continued)
When the CH7004 is operating in the master clock mode, the tables below should be used to set the FSCI registers.
When using these values, the ACIV bit in register 21H should be set to “0”, and the CFRB bit in register 06H should
be set to “1”.
Table 28. FSCI Values (525-Line Modes)
Mode
NTSC
“Normal Dot Crawl”
NTSC
“No Dot Crawl”
PAL-M
“Normal Dot Crawl
2
763,363,328
763,366,524
762,524,467
3
623,153,737
623,156,346
622,468,953
6
574,429,782
574,432,187
573,798,541
7
463,962,517
463,964,459
463,452,668
10
646,233,505
646,236,211
645,523,358
11
516,986,804
5165,988,968
516,418,687
12
452,363,454
452,365,347
451,866,351
16
623,153,737
623,156,346
622,468,953
17
545,259,520
545,261,803
544,660,334
18
508,908,885
508,911,016
508,349,645
22
521,957,831
521,960,016
521,384,251
23
469,762,048
469,764,015
469,245,826
24
428,554,851
438,556,645
428,083,911
26
569,408,543
569,410,927
568,782,819
28
1,073,741,824
1,073,746,319
1,072,561,888
Table 29. FSCI Values (625-Line Modes)
Mode
PAL
“Normal Dot Crawl”
PAL-N
“Normal Dot Crawl”
0
806,021,060
651,209,077
1
644,816,848
520,967,262
4
601,829,058
486,236,111
5
485,346,014
392,125,896
8
677,057,690
547,015,625
9
537,347,373
434,139,385
13
806,021,060
651,209,077
14
644,816,848
520,967,262
15
537,347,373
434,139,385
19
645,499,916
521,519,134
20
528,951,320
427,355,957
21
488,262,757*
394,482,422
25
705,268,427
569,807,942
27
1,073,747,879
867,513,766
When the CH7007 is operating in the slave clock mode, the ACIV bit in register 21H should be set to “1” and the
CFRB bit in register 06H should be set to “0”.
*Note: For reduced cross-color and cross-luminance artifacts, a value of 488,265,597 can be used with CFRB = "0"
& ACIV = "0".
44
201-0000-024 Rev 2.1, 8/2/99
CHRONTEL
CH7004C
Register Descriptions (continued)
Address: 1BH
Bits: 8
Bit:
7
6
5
4
3
2
1
0
Symbol:
GPIOIN3
GPIOIN2
GPIOIN1
GPIOIN0
FSCI19
FSCI18
FSCI17
FSCI16
Type:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default:
0
0
0
0
0
0
0
0
Address: 1CH
Bits: 6
Bit:
7
6
5
4
3
2
1
0
Symbol:
GOENB3
GOENB2
GOENB1
GOENB0
FSCI15
FSCI14
FSCI13
FSCI12
Type:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default:
1
1
1
1
0
0
0
0
PLL Control Register
Bit:
7
Symbol: PLLC
Address: 20H
Bits: 6
6
5
4
3
2
1
0
Symbol:
PLLCPI
PLLCAP
PLLS
PLL5VD
PLL5VA
MEM5V
Type:
R/W
R/W
R/W
R/W
R/W
R/W
Default:
0
0
1
0
1
0
The following PLL and memory controls are available through the PLL control register:
MEM5V
MEM5V is set to 1 when the memory supply is 5 volts. The default value of 0 is used when the
memory supply is 3.3 volts.
PLL5VA
PLL5VA is set to 1 when the phase-locked loop analog supply is 5 volts (default). A value of 0 is
used when the phase-locked loop analog supply is 3.3 volts.
PLL5VD
PLL5VD is set to 1 when the phase-locked loop digital supply is 5 volts. A value of 0 is used when
the phase-locked loop digital supply is 3.3 volts (default).
PLLS
PLLS controls the number of stages used in the PLL. When the PLL5VA is 1 (5V analog PLL
supply) PLLS should be 1, and seven stages are used. When PLL5VA is 0 (3.3V analog PLL
supply) PLLS should be 0, and five stages are used.
PLLCAP
PLLCAP controls the loop filter capacitor of the PLL. A recommended listing of PLLCAP vs.
Mode is shown below
PLLCPI
PLLCHI controls the charge pump current of the PLL. The default value should be used.
201-0000-024 Rev 2.1, 8/2/99
45
CHRONTEL
CH7004C
Register Descriptions (continued)
Table 30. PLL Capacitor Setting
46
Mode
PLLCAP
Value
0
1
1
1
2
1
3
0
4
1
5
0
6
1
7
1
8
0
9
1
10
1
11
1
12
0
13
1
14
1
15
1
16
0
17
0
18
0
19
0
20
1
21
0
22
1
23
1
24
0
25
1
26
1
27
0
28
1
201-0000-024 Rev 2.1, 8/2/99
CHRONTEL
CH7004C
Register Descriptions (continued)
CIV Control Register
Bit:
7
Symbol: CIVC
Address: 21H
Bits: 5
6
5
4
3
2
1
0
Symbol:
CIV25
CIV24
CIVH1
CIVH0
ACIV
Type:
R
R
R/W
R/W
Default:
0
0
0
1
R/W
0
The following controls are available through the CIV control register:
ACIV
When the automatic calculated increment value is 1, the number calculated and present at the CIV
registers will automatically be used as the increment value for subcarrier generation, removing the
need for the user to read the CIV value and write in a new FSCI value. Whenever this bit is set to
1, the subcarrier generation must be forced to free-run mode.
CIVH[1:0]
These bits control the hysteresis circuit which is used to calculate the CIV value.
CIV[25:24]
See descriptions in the next section.
Calculated Increment Value Register
Bit:
Symbol: CIV
Address: 22H - 24H
Bits: 8
7
6
5
4
3
2
1
0
Symbol:
CIV#
CIV#
CIV#
CIV#
CIV#
CIV#
CIV#
CIV#
Type:
R
R
R
R
R
R
R
R
Default:
0
0
0
0
0
0
0
0
The CIV registers 22H through 24H contain a 26-bit value, which is the calculated increment value that should be
used as the upper 26 bits of FSCI. This value is determined by a comparison of the pixel clock and the 14MHz clock.
The bit locations and calculation of CIV are specified as the following:
Register
21H
22H
23H
24H
Contents
CIV[25:24]
CIV[23:16]
CIV[15:8]
CIV[7:0]
Register (Continued)
Version ID Register
Symbol: VID
Address: 25H
Bits: 8
Bit:
7
6
5
4
3
2
1
0
Symbol:
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
Type:
R
R
R
R
R
R
R
R
Default:
0
0
1
1
0
0
1
0
This read-only register contains a 8-bit value indicating the identification number assigned to this version of the
CH7004. The default value shown is pre-programmed into this chip and is useful for checking for the correct version
of this chip, before proceeding with its programming.
201-0000-024 Rev 2.1, 8/2/99
47
CHRONTEL
CH7004C
Address Register
Bit:
7
Symbol: AR
Address: 3FH
Bits: 6
6
5
4
3
2
1
0
Symbol:
AR5
AR4
AR3
AR2
AR1
AR0
Type:
R/W
R/W
R/W
R/W
R/W
R/W
Default:
X
X
X
X
X
X
The Address Register points to the register currently being accessed.
Electrical Specifications
Table 31.Absolute Maximum Ratings
Symbol
Description
VDD relative to GND
Input voltage of all digital pins1
TSC
Max
Units
- 0.5
Min
7.0
V
GND - 0.5
VDD + 0.5
V
Analog output short circuit duration
Typ
Indefinite
Sec
TAMB
Ambient operating temperature
- 55
85
°C
TSTOR
Storage temperature
- 65
150
°C
TJ
Junction temperature
150
°C
TVPS
Vapor phase soldering (one minute)
220
°C
PMAX
Maximum power dissipation
1.9
W
Notes:
1 Stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device.
These are stress ratings only. Functional operation of the device at these or any other conditions above those
indicated under the normal operating condition of this specification is not recommended. Exposure to absolute
maximum rating conditions for extended periods may affect reliability.
2 The device is fabricated using high-performance CMOS technology. It should be handled as an ESD-sensitive
device. Voltage on any signal pin that exceeds the power supply voltage by more than +0.5V can induce
destructive latch.
48
201-0000-024 Rev 2.1, 8/2/99
CHRONTEL
CH7004C
Electrical Specifications (Continued)
Table 32.Recommended Operating Conditions
Symbol
VDD
Description
DAC power supply voltage
Min
Typ
Max
Units
4.75
5.00
5.25
V
5.00
5.25
3.6
AVDD
Analog supply voltage
DVDD
Digital supply voltage
3.3
Output load to DAC outputs
37.5
RL
Ω
Table 33. Electrical Characteristics (Operating Conditions: TA = 0oC - 70oC, VDD = 5V ± 5%)
Symbol
Description
Video D/A resolution
Min
9
Full scale output current
Typ
Max
Unit
9
9
Bits
33.89
Video level error
mA
10
%
VDD & AVDD current (5.V)(Simultaneous
S-Video & composite outputs)
105
mA
DVDD current (3.3V)
40
mA
Note: As applied to Tables 32, 33 and 34, Recommended Operating Conditions are used as test conditions unless otherwise specified.
External voltage reference used with RSET = 360 Ω, VREF = 1.235V, and NTSC CCIR601 operation.
Table 34. Timing - TV Encoder
Symbol
Description
Min
Typ
Max
Unit
tP1
Pixel Clock Period
20
50
nS
tPH1
Pixel Clock High Time
8
25
nS
tdc1
Pixel Clock Duty Cycle (tPH1/tP1)
40
60
%
tP2
Pixel Clock Period
10
25
nS
tPH2
Pixel Clock High Time
tdc2
Pixel Clock Duty Cycle (tPH2/tP2)
40
tP3
Pixel Clock Period
10
tPH3
Pixel Clock High Time
tdc3
Pixel Clock Duty Cycle (tPH3/tP3)
201-0000-024 Rev 2.1, 8/2/99
50
nS
50
60
%
17
nS
nS
40
50
60
%
49
CHRONTEL
CH7004C
Table 35. Digital Inputs / Outputs
Symbol
Description
Max
Unit
0.4
V
3.4
VDD + 0.5
V
SD Input
Low Voltage
GND-0.5
1.4
V
VDATAIH
D[0-15] Input
High Voltage
2.5
DVDD+0.5
V
VDATAIL
D[0-15] Input
GND-0.5
0.8
V
VSDOL
SD Output
Low Voltage
VIICIH
SD Input
High Voltage
VIICIL
Test Condition
Min
Typ
IOL = 3.2 mA
Low Voltage
VP-OUTOH
P-OUT Output
High Voltage
IOL = - µA
VP-OUTOL
P-OUT Output
Low Voltage
IOL = mA
Note:
2.8
V
0.2
V
1. VIIC - refers to I2C pins SD and SC.
2. VDATA - refers to all digital pixel and clock inputs.
3. VSD - refers to I2C pin SD as an output
4. VP-OUT - refers to pixel data output.Time - Graphics
Table 36. Timing -Graphics
Symbol
Description
Min
Typ
Max
Unit
tHSW
Horizontal Sync Pulse Width
1
t
HD
Pixel Clock to Horizontal Leading Edge Delay
2
tSP1,tSP2,tSP3
Setup time from Pixel Data to Pixel Clock
2
nS
tPH1,tHP2,tPH3
Hold time from Pixel Clock to Pixel Data
2
nS
50
tp
17
nS
201-0000-024 Rev 2.1, 8/2/99
Chrontel
CH7004C
ORDERING INFORMATION
Part number
Package type
Number of pins
Voltage supply
CH7004C-V
PLCC
44
3V/5V
CH7004C-T
TQFP
44
3V/5V
Chrontel
2210 O’Toole Avenue
San Jose, CA 95131-1326
Tel: (408) 383-9328
Fax: (408) 383-9338
www.chrontel.com
E-mail: [email protected]
1998 Chrontel, Inc. All Rights Reserved.
Chrontel PRODUCTS ARE NOT AUTHORIZED FOR AND SHOULD NOT BE USED WITHIN LIFE SUPPORT SYSTEMS OR NUCLEAR FACILITY APPLICATIONS WITHOUT THE
SPECIFIC WRITTEN CONSENT OF Chrontel. Life support systems are those intended to support or sustain life and whose failure to perform when used as directed can reasonably
expect to result in personal injury or death. Chrontel reserves the right to make changes at any time without notice to improve and supply the best possible product and is not
responsible and does not assume any liability for misapplication or use outside the limits specified in this document. We provide no warranty for the use of our products and assume no
liability for errors contained in this document. Printed in the U.S.A.
201-0000-024 Rev 2.1, 8/2/99
51

Open as PDF

Similar pages: ETC CH7002D-V; ETC CH7301A-T; ETC CH5101A-L; ETC CH7202; WINBOND W9952; ETC CH7013A; ETC CH7003B-T; ETC CH7008-T; ETC CH7006C-T; ETC CH7005C-T; ETC CH7008A; ETC CH7013B-DF; ETC CH7009A-T; ETC CH7012; ETC ICM320TCA; ETC SD1010; ETC SD1210; AZDISPLAYS AOM150X03; ETC DS1803-50