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Clock Interface
The U2001 (E-Gold + V3) clock generation unit is used to generate all major system clocks. There are two clock signals
connected to the clock generation unit.
8
32 kHz clock F32K
8
26 MHz clock F13/26M
The 32 kHz oscillator is used for the Real Time Clock block. As a power-saving feature the 32 kHz clock can be also used for
the MCU domain. The 32 kHz oscillator and the RTC block have its own power supply pads. It has the facility for a back-up
power source for when the main battery is discharged or remoed temporarily.
The 26 MHz clock is used as the major U2001 (E-Gold + V3) clock reference. An on chip shaper is used to maintain the
low-swing input level on F13/26M. It can be powered-up with a delay (programmable in ECO block) related to the TCXO
power-up. This can slightly reduce overall power consumption.
CLKCTRL Clock Control Register
PLLUP :
PLL Power Up Bit
SWCLK :
PLL Clock Switch Bit
CLKAEN :
CLKANA Enable Bit
SXMEN :
Coprocessor clock enable
SX52M :
Coprocessor clock switch
AFCEN :
AFC Enable Bit
CPUH :
Enables 52 MHz operation of the CPU and serial interface
CPUPRE [2:0] : CPU Clock Prescale Factor
AFC32KEN :
AFC clock enable during ECO eco sleeep mode
13/26MHz_IN : Configure the CGU for the operation with either 13 MHz or 26 MHz input
CGURST Clock Generation Uint Reset Register
DSPRST :
DSP Reset Bit
SIMRST :
SIM Card Interface Reset Bit
RTCRST :
Real Time Clock Rest Bit
DSPSLOW :
DSP slow-down control bit
The frequency of clk_pll depends on 13/26 MHZ_IN and DSPSLOW refers to the below table.
15
14
13
12
11
10
9
8
13/26
-
-
AFC32KEN
-
CPUPRE (2:0)
MHz_IN
7
6
5
4
3
2
1
0
-
CPUH
AFCEN
SX52M
SXMEN
CLKAEN
SWCLK
PLLUP
15
14
13
12
11
10
9
8
DSPSLOW
0
0
0
0
0
r
r
DSPSLOW
13/26 MHZ_IN
Frequency of Input
Frequency of
Frequency of
Frequency of
Clock F13/26M
clk_pll
clk_dsp
clk_master
0
0
26 MHz
104 MHz
104 MHz
52MHz
0
1
13 MHz
104 MHz
104 MHz
52MHz
1
0
26 MHz
156 MHz
78 MHz
52MHz
1
1
13 MHz
156 MHz
78 MHz
52MHz
7
6
5
4
3
2
1
0
0
0
0
0
RTCRST
SIMRST
DSPRST
Содержание EB-X400
Страница 86: ...12 1 12 LAYOUT DIAGRAMS 12 1 Main Board U2001 ...
Страница 87: ...12 2 ...
Страница 88: ...12 2 Upper Face PCB 12 3 Green Black Black White ...
Страница 89: ...12 3 Hinge PCB 12 4 ...
Страница 90: ...12 4 SIM PCB 12 5 ...