DV-502/503/DVF-3050/3550
7
CIRCUIT DESCRIPTION
Port No.
Port Name
I/O
Main
Alternate function
Function
Input
Output
36
I REF YCC
I
I REF DAC YCC
35
V REF YCC
I
Y REF DAC YCC
23
VDD RGB
-
YDDA RGB =2.5V
24
VSS RGB
-
GND
30
VDD YCC
-
YDDA YCC =2.5V
31
VSS YCC
-
GND
Shared memory interface
69~66
SMI ADR(0~3)
O
Address bus SDRAM
58~63
SMI ADR(4~9)
O
Address bus SDRAM
70~73
SMI ADR(10~13)
O
Address bus SDRAM
84~93
SMI DATA(0~15)
I/O Data bus SDRAM
97~102
74,75
SMI CS(0,1)
O
Chip select bank 0,1
76
SMI RAS
O
RAS SDRAM
77
SMI CAS
O
CAS SDRAM
78
SMI WE
O
SDRAM write enable
79,80
SMI DQML, U
O
DQ MASK EN LOW,
UP
82
SMI CLKIN
I
SDRAM clock in
95
SMI CLKOUT
O
SDRAM clock out
Power supply
4,47,81,107
136,159,184
VDD3 3
-
3.3V Power supply
14,37,64
94,119,149 VDD2 5
-
2.5V Power supply
171 198
5,15,38,50
65 83,96
108,121,137 VSS
-
GND
150,160,172
185,199
Pin No.
Pin Name
I/O
Description
6
DIN
I
Inputs serial data at rising edge of shift clock,starting from lower bit.
5
DOUT
O
Output serial data at falling edge of shift clock,starting from lower bit.
This is N-ch open-drain output pin.
9
STB
-
Strobe pin.
8
CLK
I
Reads serial data at rising edge, and output data at falling edge.
52
OSC
-
Connect resistor for determining oscillation frequency to this pin.
15~26
S1/KS1~S12/KS12
O
Segment output pins (Dual function as key source).
44~39
G1~G6
O
Grid output pins.
27~32
S13/G16~S18/G11
O
These pins are selectable for segment or grid output.
35,36
S19/G11,S20/G19
50~46
LED1~LED5
O
Unused.
10~13
KEY1~KEY4
I
Data input to these pins is latched at end of display cycle.
1~4
NC
-
Unused.
14,33,45
VDD
-
+5V power supply.
51
VSS
-
Connect this pin to GND of system.
34
VEE
-
-35V power supply.
7
NC
-
Unused.
2-1 VFO controller : uPD16311(IC901)
