Toshiba 29VH27E, Service Manual

Page: 69 / 171

8
WP
This pin must be connected to either V
SS
or V
CC
. If tied to V
SS
, normal memory operation is enabled
(read/write the entire memory 000-FFF). If tied to V
CC
, WRITE operations are inhibited. The entire
memory will be write-protected. Read operations are not affected.
W
CC
+2.5V to 6V Power Supply
W
SS
Ground
14.4.SDA5275
14.4.1.Features
• Single chip teletext IC
• Analog CVBS-input with onchip clamping circuitry
• Slicer
• Supports level 1, 2.5 and 3.5 ETSI teletext standard
• Stores up to 14 teletext pages on chip
• Stores up to 2048 teletext pages with external 16 M memory
• SDA 5275: full level 2.5 processing
• Analog RGB-output
• 41 Latin script languages
• 12 ´ 10 character size
• Parallel display attributes
• 64 from 4096 colors selectable
• Enhanced flash modes
• Dynamically redefinable character set (DRCS, PCS)
• Pixel graphics
• Full screen display (64 ´ 32 or 80 ´ 24 character positions)
• Horizontal and vertical scrolling
• Graphic cursors
• 4:3 and 16:9 display
• Multinorm display (50/60/100/120 Hz)
• RISC-processor
• Firmware downloadable
• I
2
C / 3 wire UART-interface (1 Mbit/s)
• Independent clocks for acquisition and display
• Tools for greatly simplified software development
• 24-Kbyte on-chip reconfigurable DRAM
• 44160-bit character ROM
• One external crystal for all standards
14.4.2.Pin Definition and functions
Pin No. P-LCC-68-1 Symbol Function
1 INTQ Interrupt request output to ext. controller
2 CLK-IO System clock input/output
3 TCSQ/FLD Composite sync output/ field output
4 VS/VCS Vertical sync input/output
5 HS Horizontal sync input/output
6 XOUT 20.5-MHz crystal oscillator output
7 XIN 20.5-MHz crystal oscillator input
8 GPO General purpose output
9 TM Test pin, leave open or connect VSS
10 CVBS CVBS-video signal input
11 V
DD1
+ 5 V digital supply
12 V
DDA
+ 5 V analog supply
13 V SSA1 Analog ground
14 N.C. Not connected
15 N.C. Not connected
16 V
DD2
+ 5 V digital supply
17 RES Chip reset
18 N.C. Not connected