Spi Bus Interface; Universal Connector And Option Selects; Figure 9. Universal Connector; Figure 10. Vocon Board Connector - J201 - Motorola ASTRO Digital Saber Service Manual

SPI Bus Interface

Universal Connector
and Option Selects
7 12
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This bus is a synchronous serial bus made up of a data, a clock, and an
individual IC unique select line. It's primary purpose is to configure
the operating state of each IC. ICs programmed by this include;
display module, ADSIC, Fractional N Synthesizer, Pendulum Reference
Oscillator, DAIC, and if equipped, the secure module.
The MCU (U204) is configured as the master of the bus. It provides the
synchronous clock (SPI_SCK), a select line, and data (MOSI [Master
Out Slave In]). In general the appropriate select line is pulled low to
enable the target IC and the data is clocked in. Actually the SPI bus is
a duplex bus with the return data being clocked in on MISO (Master In
Slave Out). The only place this is used is when communicating with
the secure module. In this case, the return data is clocked back to the
MCU on MISO (master in slave out).
The universal connector is located on the back of the radio. It is the
external port or interface to the outside and is used for programming
and interfacing to external accessories. The signals are outlined in the
following diagram. The universal connector connects to the VOCON
board at J201 through a flex circuit routed down the back of the
external housing. Connections to the universal connector and J201 on
the VOCON board are shown in Figure 9 and Figure 10.
SIGNAL NAMES
1. Speaker Common
2. External Speaker
3. LH data/ Boot data out
4. External MIC
5. CTSOUT*
6. SB9600 Busy
7. Option Select 1
8. Opt B+/ Boot Sel/ Vpp
9. RTSIN*/ Keyfail
10. Opt sel2 (Keyload)
11. RS232 data out/ Boot data in
12. RS232 data in
Figure 9 . Universal Connector
VOCON BOARD CONNECTOR
J201-1 N.C
J201-2 N.C.
J201-3 N.C.
J201-4 LH_DATA/BOOT_DATA_OUT
J201-5 Ext Mic
J201-6 SB9600_BUSY
J201-7 Option Select 1
J201-8 RS232_DATA_IN
J201-9 Option Sel 2 (Keyload*)
J201-10 RTSIN*/KEYFAIL*
J201-11 Speaker Common
J201-12 External Speaker
J201-13 OPTB+/Boot Sel/Vpp
J201-14 CTSOUT*
J201-15 RS232 Data Out/ Boot Data In
Figure 10 . VOCON Board Connector - J201
1 3
2
4 5 6
7 8 9
10 11 12
VIEW FROM BACK OF
RADIO
MAEPF-24343-O
14 2
15 1
MAEPF-24344-O