CH7006C-V ETC, CH7006C-V Datasheet - Page 38

• Manufacturer Part Number: CH7006C-V
• Description: Digital PC to TV Encoder Features
• Manufacturer: ETC

CHRONTEL
Register Descriptions (continued)
Power Management Register
This register provides control of the power management functions, a software reset (ResetB), and the SCART
output enable. The CH7006 provides programmable control of its operating states, as described in the table below.
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 I
SCART (bit 4) is the SCART enable. Setting SCART = 0 means the CH7006 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
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 is set to 011 (normal mode).
38
Table 22. Power Management
Bit:
Symbol:
Type:
Default:
000
001
010
011
1XX
Bit:
Symbol:
Type:
Default:
PD[2:0]
2
C state machines.
7
7
Composite Off
Power Down
S-Video Off
Normal (On)
Full Power Down
Operating State
6
6
5
5
CVBS DAC is powered down.
Most pins and circuitry are disabled (except for the buffered clock outputs
which are limited to the 14MHz output and VCO divided output when the
DS/BCO pin is selected to be an output).
S-Video DACs are powered down.
All circuits and pins are active.
All circuitry is powered down except I
4
SCART
R/W
0
4
3
Reset*
R/W
1
3
YT
R
0
Functional Description
2
2
PD2
R/W
0
2
CT
R
0
C circuit.
201-0000-026 Rev 2.1, 8/2/99
Symbol: PMR
Address: 0EH
Bits: 5
Symbol: CDR
Address: 10H
Bits: 4
1
PD1
R/W
1
1
CVBST
R
0
CH7006C
0
PD0
R/W
1
0
SENSE
W
0