lc7872e Sanyo Semiconductor Corporation, lc7872e Datasheet - Page 11

• Manufacturer Part Number: lc7872e
• Description: Cd Graphics Decoder
• Manufacturer: Sanyo Semiconductor Corporation

Pin Applications
1. Crystal Clock Oscillator; XIN1, XOUT1, XIN2, XOUT2, N/P1, N/P2, FSC, CSYNC, LINE and VSYNC
2. Subcode Interface; S1, S2, SBSY, SFSY, PW, SBCK and MUTE
The LC7872E provides two crystal oscillator systems as follows.
Pins XIN1 and XOUT1 are for use with a 14.31818 MHz crystal oscillator (NTSC)
Pins XIN2 and XOUT2 are for use with a 17.734476 MHz crystal oscillator (PAL)
Crystals can be connected to either crystal system 1 or 2 according to the application, or both systems can be used
under the control of pins N/P1 and N/P2 to implement an application that supports both video standards. The N/P1
pin switches the LC7872E RGB encoder block between NTSC and PAL and the N/P2 pin switches the decoder block
between NTSC and PAL. The FSC pin outputs a clock that is the crystal oscillator frequency divided by four. The
CSYNC pin is the composite synchronization signal output and VSYNC is the vertical synchronization signal output.
The LINE pin switches the number of lines on a screen.
The table below lists the pin states in each mode.
The LC7872E supports three interface modes under the control of pins S1 and S2. When the MUTE pin is set high,
SBSY and PW input is disabled and SBCK output stops.
The SBCK delivery condition is that SFSY be confirmed to be low about 2.2 µs after the SFSY falling edge in
LC7860K/63 interface mode. In the other interface modes, the condition is that SFSY be confirmed to be high and
SBSY be confirmed to be low about 2.2 µs after the SFSY rising edge.
• LC7860 interface (Pin names in parentheses are LC7860 pins.)
Mode
Note: 1. PWSY will be high during the S0 and S1 periods.
S1
S2
14.31818 MHz
14.30244 MHz
XIN1, XOUT1
2. The SBSY pin must be held low.
*
LC7861N/67 interface
17.734476 MHz
XIN2, XOUT2
Low
Low
*
*
N/P1
High
Low
Low
N/P2
High
High
Low
LC7872E
Television system
LC7860K/63 interface
PAL/GBIDH
NTSC/M
PAL/M
High
Low
3.579545 MHz
4.433619 MHz
3.575611 MHz
FSC
LC7868/69/681 interface
LINE
H
H
H
L
L
L
High
High
16.71511323 ms
16.65155767 ms
19.96788628 ms
20.09588555 ms
16.73350841 ms
16.6698829 ms
CSYNC
No. 4868-11/17