Motorola APX 1000 Detailed Service Manual page 738

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3.2.4.8.2 Audio SSI
OMAP's McBSP1 interface is configured as a SSI interface dedicated to carry transmit and receive
audio data to peripheral devices. The peripherals connected to this bus include MAKO, Audio
CODEC and CPLD. The bus also connects to the keypad board. MAKO generates the clock and
frame sync signals for this bus.
RED TX
CODECs
RED RX
3.2.4.8.3 ARM SPI
This SPI interface is controlled by OMAP's ARM core. Devices connected to this bus include MAKO,
display controllers and the audio CODEC.
3.2.4.8.4 DSP SPI
This SPI interface is controlled by the DSP core of the OMAP processor. This bus is used to
configure and control devices on the RF deck.
MACE
RD 1
SSC 1
TD 1
( Red )
PA 28 (GPIO)
Hi_Sec */Normal
TD 3
0
1
CPLD
Figure 3-23. Audio SSI Configuration
Theory of Operation
RD 2
SSC 2
(Sniffer)
RD 0
SSC 0
TD 0
(Black)
BLACK or
RED RX
BLACK or
0
RED TX
1
: Controller
Keypad Board
Main Board
OMAP