Figure 3-26. Rx / Tx Ssi Configuration; Figure 3-27. Audio Ssi Configuration - Motorola APX 5000 Service Manual

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3.2.4.10 Peripheral Devices
The OMAP processor is equipped with multiple buses and interfaces that are configured for
peripheral interconnection.
3.2.4.10.1 Receive and Transmit SSI
These two interfaces are dedicated for communicating with the RF deck digital interface, carrying
receive and transmit base band signals. The OMAP processor generates the clock and FSYNC
signals for the receive SSI interface. The RF deck generates these signals for the transmit SSI
interface.
RF BOARD
RX_FSYNC
RX_CLK
ABACUS
RX_DA
TX_FSYNC
TX_CLK
TRIDENT
TX_DA
3.2.4.10.2 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, MACE and CPLD. The bus also connects to the option board via J3001. MAKO generates
the clock and frame sync signals for this bus.
RED TX
CODECs
RED RX
RX SSI
McBSP 2
3
OMAP 1710
McBSP 1
TX SSI
McBSP 2
3
MAKO

Figure 3-26. RX / TX SSI Configuration

MACE
RD 1
SSC 1
TD 1
( Red )
PA 28 (GPIO)
TD 3 Hi_Sec */Normal
0
1
CPLD

Figure 3-27. Audio SSI Configuration

VOCON BOARD
SYNC
BCLK
CPLD
VC_FSYNC
VC_DCLK
RD 2
SSC 2
(Sniffer)
RD 0
SSC 0
TD 0
(Black)
0
1
Theory of Operation
: Controller
MCLK
TI
WCLK
CODEC
MACE/CODEC
FSYNC
MACE/
MACE
CODEC_CLK
Expansion Board
Vocon Board
BLACK or
RED RX
BLACK or
RED TX
OMAP