3-52 Theory of Operation: Controller
3.2.6.5 Side Controls
The side controls include three programmable, momentary, pushbutton switches (Side Button 1
[SB1], Side Button 2 [SB2], Top Side Button [MON]) and a Push-To-Talk switch [PTT]. These
components interface to the expansion board via connector J2005 through a two-piece, bonded flex
circuit. A board-to-board connection routes the side controls signals from expansion board connector
P2001 to connector J4001 of the controller board. See Chapter 7 for pin out names and numbers.
Side button 1 (R4006), side button 2 (R4007) and the top side button (R6101) are inputs to the CPLD
and are biased to 1.875V. A button press is detected when the OMAP reads a 'LO' state from the
CPLD EMIFS interface. PTT (R4005) is connected directly to OMAP and a button press is detected
when a LO state is read.
3.2.6.6 GCAI
The GCAI (Global Communications Accessory Interface) connector is a 15 pin interface located on
the side of the radio. The connector interfaces the radio with accessories and is used for
programming. When the OMAP (U6501) detects that an accessory has been attached through a
logic low on GPIO0, it will identify the device by reading the GCAI_ONE_WIRE line. Once the device
type is identified, the appropriate signals are multiplexed through MAKO to the GCAI connector for
the particular device. Figure 3-37 is a block diagram of the GCAI interface.
Mounted to the side connector is a printed circuit board that houses ESD protection circuitry and an
auxiliary RF connector. The universal side connector interfaces with the expansion board via the P1
connector of a flex circuit and the J2004 connector of the expansion board. A board-to-board
connection routes universal side connector signals through expansion board connector P2001 to the
controller board. The figures below show the connections and signal assignments from the universal
connector to the controller board.
P 2 , 3 0 0 , 1
1 3 , 0 # 0 , 2
2
3 , 1
Table 3-9. Key Map Matrix (Continued)
Key Row, Column Map Key Row, Column Map
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