Operating instructions

5-6 Controller Board
The HPD SPI is a synchronous serial bus made up of four lines, SPI_CLK, SPI_MOSI, SPI_MISO,
and chip select. The SPI_CLK line is used to control the speed of the data to/from the peripheral IC’s
and the OMAP processor. This clock can be adjusted to different speed based on the IC’s
specification.
HPD SPI module is used to interface to Trident (U001), Abacus III (U600), and the MAKO (U3000).
This interface operates at 1.875V logic level. SPI_MOSI, or commonly known as TRANSMIT Data, is
a data string from OMAP while SPI_MISO or RECEIVE Data is data string to the OMAP.
The MMC SPI is not used in portable radio.
2.4 Serial Synchronous Interface (SSI)
Figure 5-5 illustrates the controller SSI used in the radio controller design.
Figure 5-5: SSI Connections
The OMAP processor (U1000) has a total of three SSI or multi-channel buffer serial ports (McBSP)
modules that are used to directly interface to the CODECs in the Trident, Abacus, and MAKO, as well
as command/ data connections to the Option Board, and between Tx and Rx radios within a
Repeater.
As shown in Figure 5-5, McBSP1 is a 4-wire bus and interface to the MAKO CODEC as well as the
Option Board. McBSP2 is 6-wire bus; 3-wire dedicated to the Trident Tx audio and the other 3-wire to
Abacus Rx audio. McBSP3 is a 4-wire bus, and used primarily to interface between Tx and Rx radios
within a Repeater.
McBSP2
TRIDENT
U001
1.8V
DMCS
TX_DATA
TX_FSYNC
TX_CLK
ABACUS III
U600
DOUTA
FS
CLKOUT
MAKO
U3000
VC_TX
VC_DCLK
VC_FSYNC
GPIO_2 (D15)
McBSP2.DX (AA5)
McBSP2.FSX (W7)
McBSP2.CLKX (Y6)
VC_RX
OMAP1710
U1000
McBSP3.DR (T19)
McBSP3.CLKX (N14)
McBSP3.DX (P14)
McBSP3.FSX (AA17)
1.8V
1.8V
10K
1.8V
McBSP2.DR (P10)
McBSP2.FSR (W6)
McBSP2.CLKR (V7)
McBSP1
McBSP1.DX (H18)
McBSP1.CLKX (G21)
McBSP1.DR (H20)
McBSP1.FSX (H15)
McBSP3
OPTION
BOARD I/F
J9001
VC_TX
CLK
FSYNC
VC_RX
SYNCB
GPIO_40 (W15)
R3010