Operating instructions

5-4 Controller Board
2.1.2 Power ON/OFF
The radio can be switched ON in only one condition:
1. MECH_SW turned ON
Turning the rotary switch (S9001) ON will cause MAKO (U3000) to turn ON SWB+. After application
of power to SWB+, MAKO regulators are sequenced to turn ON power to all MAKO internal blocks
and external system including OMAP processor (U1000), FLASH (U2000), SDRAM (U2001), and
radio RF section.
Radio can be turned OFF in one of the three conditions:
1. MECH_SW turned OFF
If the radio is manually turned OFF, MAKO (U3000) will start a 125ms watchdog timer. The OMAP
processor (U1000) may tickle the watchdog timer as needed to keep DC power ON as it shuts down
the radio. Once the watchdog timer expires, MAKO turns OFF the DC regulators and SWB+.
2. Low Battery
While the radio is ON, if battery voltage drops to low level threshold, OMAP processor (U1000) will
initiate a shutdown process. It will store the radio personality data to the FLASH (U2000) before
turning OFF.
3. Thermal Shutdown
Hard and Soft limits for thermal shutdown are implemented into MAKO IC (U3000). When MAKO die
temperature reaches Soft Thermal Limit (135
°C), microprocessor will be interrupted to begin
shutdown procedures. If Hard Thermal Limit (155
°C) is reached before OMAP processor (U1000)
can finish shutdown tasks, the radio will turn OFF immediately.
2.2 Clocks
Figure 5-3 illustrates the controller clocks used throughout the radio.
Figure 5-3: Clock Connections
MPU CLK
EXT_CLK (N18)
CLK32K_IN (P13)
OSC_IN (Y2)
OSC_OUT (W3)
OSC32K_IN (V13)
OSC32K_OUT (AA13)
SYS_CLK_IN (Y4)
DPLL1
General Pupose
TIMER
AUX_DAC
REF_IN
REF_OSC_OUT
16.8 MHZ
TCXO
+0.5 ppm (GPS & CPHER)
FREF
24.576MHZ 32.768KHZ
XOUT XIN XTAL32_OUTXTAL32_IN
+20 ppm+30 ppm
TRIDENT
U001
ABACUS III
U600
MAKO
U3000
REF_CLK
LOW_REF_CLK
SiRF GPS
U8000
xN
DSP CLK
xN
TC CLK
xN
12MHZ
+20 ppm
1.4V
10K
OMAP1710
U1000
U1006
U3003
U3004
32.768 KHz
Y3000Y3001
VSS_11 (Y13)
OMAP 3.3 Core
Y1000
+20 ppm
Y8000
32.768KHZ
RTC_XO
RTC_XI