Table 3-2. Vocon Connector P1 - Motorola ASTRO XTS 5000 Detailed Service Manual

3-4
Table 3-2 lists the connector pins, their signals, and functions. SPI refers to serial peripheral
interface, which is the control bus from the microprocessor. SSI is the serial synchronous interface
bus for data to and from the DSP. There is a RX SSI bus for demodulated data from the receiver and
a TX SSI bus for modulation data to the transmitter.
Pin
VOCON Signal
No.
1 UNSW_B+
2 UNSW_B+
3 LOCK_DET*
4 TX_SSI_DATA
5 SSI_CLK
6 SSI_FSYNC
7 16.8MHz
8 SW_B+
9 TX_SSI_FSYNC
10 TX_SSI_CLK
11 GND
12 RX_SSI_DATA
13 ABACUS3_CS
14 GND
15 VSW1
16 SPI_CLK_A
17 SPI_MISO_A
18 EEPROM_SEL*
19 TX_INHIBIT
20 GND
21 BAT_STATUS
22 GND
23 SPI_MOSI_A
24 UNI_CS
25 AD_CS
26 POR*
July 21, 2004

Table 3-2. VOCON Connector P1

XCVR XCVR
Signal I/O
FUB+ O
FUB+ O
LOCK O
TXTD O
RXCK O
SSFS O
F168 O
SWB+ I
TXFS I
TXCK I
GND
RXDO O
ABCS I
GND
VSW1 I
SPCK I
MISO O
EECS I
TXINH I
GND
BSTAT O
GND
MOSI I/O
USEL I
ADCS I
RSTL I/O
Theory of Operation: Transceiver Board
Type Description
dc Fused B+ to VOCON
dc Fused B+ to VOCON
status FGU lock detect
ssi TX SSI data
ssi RX SSI clock
ssi RX SSI frame sync
RF 16.8 MHz reference clock
dc Switch control
ssi TX SSI frame sync
ssi TX SSI clock
ssi RX SSI data
ssi SPI Abacus chip select
dc Regulated 3.8 V
spi SPI clock
spi SPI data out
spi SPI EEPROM chip select
control TX inhibit control for secure
dc Battery status
spi SPI data I/O
spi SPI universal chip select
spi SPI ADC chip select
control asynchronous reset, active low
6881094C31-D