Figure 3-37. Gcai Signal Configuration - Motorola APX 1000 Detailed Service Manual

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Table of Contents

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 Frontkit flex via connector J1 through a two-piece, bonded flex circuit.

The frontkit flex routes the side controls signals to keypad board through connector P1000 and to

Main Board through connector P2000. See

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.

Mounted to the side connector is a flex that houses ESD protection circuitry. The universal side

connector interfaces with the Front kit flex via the J2 connector of a flex circuit and the P1000

connector of the keypad board. A backkit flex routes universal side connector signals through

keypad board connector P2000 to the main board. The figures below show the connections and

signal assignments from the universal connector to the controller board.

is a block diagram of the GCAI interface.