Daewoo DSC-3270E, Service Manual, Page: 14 / 60

13
(4) PIN DESCRIPTION
Figure 2. Pin Description
IC description
RESET Reset (input, active low). The ST9+ is initialised
by the Reset signal. With the deactivation of RESET,
program execution begins from the Program memory
location pointed to by the vector contained in program
memory locations 00h and 01h.
R/G/B Red/Green/Blue. Video color analog DAC out-
puts
FB Fast Blanking. Video analog DAC output.
VOD Main power supply voltage(5V 10%, digital)
WSCF, WSCR Analog pins for the VPS/WPP slicer line
PLL.
MCFM Analog pin for the display pixel frequency multi-
plier.
OSCIN, OSCOUT Oscillator (input and output).
These pins connect a parallel-resonant crystal(24MHz
maximum), or an external source to the on-chip clock
oscillator and buffer. OSCIN is the input of the oscilltor
inverter and internal clock generator; OSCOUT is the
output of the oscillator inverter.
VSYNC Vertical Sync. Vertical video synchronisation
input to OSD. Positive or negative polarity.
HYNC/CSYNC Horizontal/Composite sync. Horizontal
or composite video synchronisation input to OSD. Posi-
tive or negativety.
PXFM Analog pin for the Display Pixel Frequency Multi-
plier
AVDD Analog VDD of PLL. This pin must be tied to
VDD externally to the ST92195.
GND Digital circuit ground.
AGND Analog circuit ground(must be tied externally to
digital GND).
CVBS1 Composite video input signal for the Teletext
slicer and sync extraction.
CVBS2 Composite video input signal for the VPS/WSS
slicer. Pin AC coupled.
AVDD1, AVDD2 Analog power supplies(must be tied
externally to AVDD).
TXCF Analog pin for the VPS/WSS line PLL.
CVBSO, JTDO, JTCK Test pins : leave floating.
JTMS, TEST0 Test pins : must be tied to AVDD2.
JTRST0 Test pin : must be tied to GND.