參數(shù)資料
型號(hào)： GM2125
廠商： Electronic Theatre Controls, Inc.
英文描述： ANALOG INTER FACE XGA/SXGA ONPANEL LCD PANEL CONTROLLER
中文描述： 模擬國(guó)際米蘭的XGA / SXGA ONPANEL液晶顯示器控制器
文件頁(yè)數(shù)： 17/54頁(yè)
文件大小： 1339K
代理商： GM2125
***
Genesis Microchip Confidential ***
gm2115/25 Preliminary Data Sheet
June 2002
15
C2115-DAT-01B
2. Host Interface Transfer Clock (HCLK)
The gm2115 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
gm2115 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 gm2115. 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 gm2115/25 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 gm2115/25 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
gm2115/25
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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