參數(shù)資料
型號(hào)： OMAP5910(RISC)
英文描述： Dual-Core Processor
中文描述： 雙核處理器
文件頁數(shù)： 121/160頁
文件大?。?/td> 1997K
代理商： OMAP5910(RISC)
Electrical Specifications
109
August 2002 Revised August 2003
SPRS197B
Table 53. 32-kHz Input Clock Timing Requirements
NO.
MIN
NOM
MAX
UNIT
CK1
tcyc
tf
tr
Frequency
32.768
kHz
CK2
Fall time
25
ns
CK3
Rise time
25
ns
CK4
Duty cycle (high-to-low ratio)
30%
70%
%
CK5
Frequency stability
70
70
ppm
CK1
CK2
CK3
CLK32K_IN
Figure 53. 32-kHz Input Clock
5.6.2 Base Oscillator (12 MHz or 13 MHz) and Input Clock
The internal base system oscillator is enabled following a device reset. The oscillator requires an external
crystal to be connected across the OSC1_IN and OSC1_OUT pins. If the internal oscillator is not used
(configured in software), an external clock source must be applied to the OSC1_IN pin and the OSC1_OUT
pin must be left unconnected. Because the internal oscillator can be used as a clock source to the OMAP
DPLL, the 12- or 13-MHz crystal oscillation frequency can be multiplied to generate the DSP clock, MPU clock,
traffic controller clock.
The crystal must be in fundamental-mode operation, and parallel resonant, with a maximum effective series
resistance of 60
maximum. The connection of the required circuit, consisting of the crystal and two load
capacitors, is shown in Figure 54. The load capacitors, C
1
and C
2
, must be chosen such that the equation
below is satisfied (recommended values are C
1
= C
2
= 10 pF). C
L
in the equation is the load specified for the
crystal. All discrete components used to implement the oscillator circuit must be placed as close as possible
to the associated oscillator pins (OSC1_IN and OSC1_OUT) and to the V
SS
pins closest to the oscillator pins
(GZG balls AA1/Y3 or GDY balls E13/K9).
NOTE:
The base oscillator is powered by the CV
DD
supply. If an external clock source is used instead of using
the on-chip oscillator, care must be taken that the voltage level driven onto the OSC1_IN pin is no greater than
the CV
DD
voltage level.
C
1
C
2
(
C
1
C
L
C
2
)
OSC1_IN
OSC1_OUT
C1
C2
12 or 13 MHz crystal
Figure 54. Internal System Oscillator External Crystal
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