S1D13742 Epson, S1D13742 Datasheet - Page 27

• Manufacturer Part Number: S1D13742
• Description: Mobile Graphics Engine
• Manufacturer: Epson

Epson Research and Development
Vancouver Design Center
1. t6 = 2*t
2. The input clock period jitter is the displacement relative to the center period (reciprocal of the center
3. The input clock cycle jitter is the difference in period between adjacent cycles.
4. The jitter characteristics must satisfy both the t5 and t6 characteristics
5. Input Duty cycle is not critical and can be 40/60
6. The minimum System Clock frequency required for correct operation depends on the cycle length of the
7.1.2 PLL Clock
Hardware Functional Specification
Issue Date: 2007/09/18
(see note 6)
(see note 1)
Symbol
f
t
frequency).
Intel 80 interface. See Section 8.4, “Setting SYSCLK and PCLK” on page 43 for more details.
OSC
OSC
t1
t2
t3
t4
t5
t6
OSC
Input clock frequency - PLL used for System Clock
Input clock frequency - CLKI used for System Clock
Input clock period
Input clock pulse width high
Input clock pulse width low
Input clock rise time (10% - 90%)
Input clock fall time (90% - 10%)
Input clock period jitter (see notes 2 and 4)
Input clock cycle jitter (see notes 3 and 4)
The PLL circuit is an analog circuit and is very sensitive to noise on the input clock
waveform or the power supply. Noise on the clock or the supplied power may cause the
operation of the PLL circuit to become unstable or increase the jitter.
Due to these noise constraints, it is highly recommended that the power supply traces or the
power plane for the PLL be isolated from those of other power supplies. Filtering should
also be used to keep the power as clean as possible. The jitter of the input clock waveform
should be as small as possible.
Table 7-1 Clock Input Requirements (CLKI)
Parameter
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0.4t
0.4t
-300
-300
Min
—
—
—
1
0
OSC
OSC
1/f
Typ
—
—
—
—
—
—
OSC
0.6t
0.6t
68.90
Max
300
300
5.0
5.0
66
—
OSC
OSC
X63A-A-001-06
S1D13742
Units
MHz
MHz
Page 27
μs
μs
μs
ns
ns
ps
ps
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