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參數(shù)資料
| 型號： | GM2120 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | XGA/SXGA LCD Controller |
| 中文描述： | 的XGA / SXGA LCD控制器 |
| 文件頁數(shù)： | 18/51頁 |
| 文件大?。?/td> | 1379K |
| 代理商： | GM2120 |
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***
Genesis Microchip Confidential ***
gm5110/20 Preliminary Data Sheet
June 2002
11
C5110-DAT-01C
The gm5110/20 TCLK oscillator circuitry is a custom designed circuit to support the use of
an external oscillator or a crystal resonator to generate a reference frequency source for the
gm5110/20 device.
4.1.1 Using the Internal Oscillator with External Crystal
The first option for providing a clock reference is to use the internal oscillator with an
external crystal. The oscillator circuit is designed to provide a very low jitter and very low
harmonic clock to the internal circuitry of the gm5110/20. An Automatic Gain Control
(AGC) is used to insure startup and operation over a wide range of conditions. The oscillator
circuit also minimizes the overdrive of the crystal, which reduces the aging of the crystal.
When the gm5110/20 is in reset, the state of the ROM_ADDR13 pin (pin number 10) is
sampled. If the pin is left unconnected (internal pull-down) then internal oscillator is enabled.
In this mode a crystal resonator is connected between TCLK (pin 152) and the XTAL (pin
151) with the appropriately sized loading capacitors C
L1
and C
L2
. The size of C
L1
and C
L2
are
determined from the crystal manufacturer’s specification and by compensating for the
parasitic capacitance of the gm5110/20 device and the printed circuit board traces. The
loading capacitors are terminated to the analog VDD power supply. This connection
increases the power supply rejection ratio when compared to terminating the loading
capacitors to ground.
Reset State Logic
N/C
XTAL
TCLK
OSC_OUT
TCLK Distribution
Internal Pull Down
Resistor
~ 60K
gm5115
152
151
10
Vdd
180 uA
100 K
CL1
CL2
Internal Oscillator Enable
Vdda
Vdda
ROM_ADDR13
Figure 4.
Using the Internal Oscillator with External Crystal
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