Vga Circuit (Refer To The - Panasonic JS-170FR Series Service Manual

2.1.7 VGA circuit (Refer to the page 4-4.)
The SM710 is used as a display controller for this system.
The SM710 is a controller designed in accordance with the SVGA (Super-VGA) Specification that enables color LCD display and
CRT display of 640 × 480 and 800 × 600 dots.
The color TFT is an interface of 18 bits (6 bits × 3), while the color DSTN is an interface of 16 bits (8 bits × 2). The image
thickness is controlled by the volume control.
A memory for Video with a capacity of 4Mbytes is incorporated. The interface toward the CPU is connected according to the PCI
bus specification. The signal level is maintained at the TTL level. The basic clock for V-RAM access and display is produced by
the internal PLL of the LSI, based on the 14.318MHz (14MHz) clock.
The SM710 executes initialize setting of the hardware by using the data bus (VMD0~22) of the Video-RAM when the reset
condition is canceled.
There are the operational functions that can be set again by software and those available only by hardware setting.
Signal
MD 0 7 MCLK
MD 1 3 MCLK
MD 2 Reserve
MD 3 3 MCLK
MD 4 MD 5
MD 5
1
1
0
MD 6 Reserve
MD 7
Reserve
MD 8 Color STN
MD 9 Inverted
MD 10 MD 11
MD 11
1
1
0
0
MD 12 MD 14
MD 13
0
MD 14
0
0
0
1
1
1
1
MD 15 24-bit interface
MD 16 Reserve (GPR70.0 )
MD 17 Reserve (GPR70.1 )
MD 18 Reserve (GPR70.2 )
MD 19 Reserve (GPR70.3 )
1
8 MCLK
4 MCLK
Reserve
4 MCLK
MD 4
0 8-bit column address
1 9-bit column address
X 10-bit column address
Reserve
Reserve
Color TFT
Normal
MD 10
1 1280 x 1024
0 1024 x 768
1 800 x 600
0 640 x 480
MD 13 MD 12
0 0 9-bit .3bit/R.G.B.
0 1 12-bit 4bit/R.G.B.
1 0 18-bit 6bit/R.G.B.
1 1 24-bit 8bit/R.G.B.
0 0 24-bit 12+12bit
0 1 Analog
1 0 36-bit 18+18bit
1 1 Reserve
16-bit interface
Reserve
Reserve
Reserve
Reserve
2-28
0
External Memory Refresh to Command Delay
External Memory RAS to CAS Delay(SGRAM)
Reserve
External Memory Pre-charge Time (SGRAM)
External Memory Column Address Control
Reserve
Reserve
Color LCD Type
TFT FPCLK Select
LCD Display Size
Color TFT Interface Type
DSTN Interface Type
User configration Bits
User configration Bits
User configration Bits
User configration Bits
Description