CALAO SYSTEMS SKY-S9500-ULP-CXX, Hardware Reference Manual

Page: 71 / 111

Snowball board System
Architecture and Design
62
8.20. Expansion headers
There are three expansion connectors on the PDK version of the Snowball. For the SDK version, only
the 1x16 2.54mm Prototyping Header is mounted.
8.20.1. Prototyping Header
This prototyping header is provided to allow a limited number of functions to be added to the Snowball
board. Below is a list of the different interfaces available on this header.
• I2C
• UART
• GPIO
8.20.2. 60 pins Top Expansion Connector
The main purpose of the expansion connector is to route additional signals from the A9500 processor.
Table 8.10 shows all of the signals that are on the 60 pin expansion header. As the A9500 has a
multiplexing feature, multiple signals can be connected to certain pins to add additional options as it
pertains to the signal available. The different columns in Table 8.10 show what other signals can be
accessed by setting the mux control register in the A9500.
Table 8.10. 60 pin Expansion Connector Signals
Pin MUX:1 MUX:2 MUX:3 MUX:4
1 VBAT
2 VBAT
3 VBAT
4 VBAT
5 SYSCLK2
6 GPIO5 U1_TXD I2C4_SDA IP_GPIO6
7 GPIO144 SSP0_FRM
8 GPIO4 U1_RXD I2C4_SCL IP_GPIO5
9 GPIO146 SSP0_TXD
10 RESETn
11 GPIO220 HSIR_DAT0 MC3_FBCLK SPI0_CLK
12 GPIO143 SSP0_CLK
13 GPIO221 HSIR_RDY0 MC3_CMD
14 GPIO145 SSP0_RXD
15 GPIO219 HSIR_FLA0 MC3_CLK
16 PONKEY2
17 GPIO224 HSIT_RDY0 MC3_DAT2 SPI0_TXD
18 GPIO151
19 GPIO225 HSIT_CAWAKE0 MC3_DAT3 SPI0_RXD
20 GPIO152
21 GPIO223 HSIT_DAT0 MC3_DAT1 SPI0_FRM
22 GPIO31