Panasonic JS-170FR Series, Service Manual

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2-28
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 1 0 Description
MD 0 7 MCLK 8 MCLK External Memory Refresh to Command Delay
MD 1 3 MCLK 4 MCLK External Memory RAS to CAS Delay(SGRAM)
MD 2 Reserve Reserve Reserve
MD 3 3 MCLK 4 MCLK External Memory Pre-charge Time (SGRAM)
MD 5 MD 4 MD 4
MD 5
1
1
0 0
1
X 8-bit column address
9-bit column address
10-bit column address
External Memory Column Address Control
MD 6 Reserve Reserve Reserve
MD 7 Reserve Reserve Reserve
MD 8 Color STN Color TFT Color LCD Type
MD 9 Inverted Normal TFT FPCLK Select
MD 11 MD 10 MD 10
MD 11
1
1
0
0 1
0
1
0 1280 x 1024
1024 x 768
800 x 600
640 x 480
LCD Display Size
MD 14 MD 13 MD 12 MD 12
MD 13
MD 14
0
0
0
0
1
1
1
1 0
0
1
1
0
0
1
1 0
1
0
1
0
1
0
1 9-bit .3bit/R.G.B.
12-bit 4bit/R.G.B.
18-bit 6bit/R.G.B.
24-bit 8bit/R.G.B.
24-bit 12+12bit
Analog
36-bit 18+18bit
Reserve
Color TFT Interface Type
MD 15 24-bit interface 16-bit interface DSTN Interface Type
MD 16 Reserve (GPR70.0 ) Reserve User configration Bits
MD 17 Reserve (GPR70.1 ) Reserve User configration Bits
MD 18 Reserve (GPR70.2 ) Reserve User configration Bits
MD 19 Reserve (GPR70.3 ) Reserve User configration Bits