Analog Devices EZ-KIT Lite ADSP-BF707, System Manual

Page: 44 / 85

Software-Controlled Switches (SoftConfig)
2-10 ADSP-BF707 EZ-KIT Lite Evaluation System Manual
The ADSP-BF707 EZ-KIT Lite Schematic shows how the two Microchip
GPIO expanders are connected to the board’s ICs.
Table 2-6 and Table 2-7 show the output signals of the Microchip GPIO
expander (
U39
), with a TWI address of 0100 001X, where X represents the
read or write bit. The signals that control an individual FET have an entry
under the
FET column. The Component Connected column shows the
board IC that is connected if the FET is enabled. The Microchip (
U39
) is
controlling the enable signal of a FET switch. Also note that if a particular
functionality of the processor signal is being used, it will be in
bold font
under the Processor Signal column.
Table 2-5. I
2
C Hardware Address 0x42
GPIO MCP23017 Register Address Default Value
GPIOA 0x12 0x85
GPIOB 0x13 0x83
Table 2-6. Output Signals of Microchip GPIO Expander
(U39 Port A)
Bit Signal Name Description FET Processor Signal
(if applicable)
Component
Connected Default
0
SPIFLASH_CS_EN
SPI flash CS
U3 PB_15/ SPI2_SEL1 /
TRACE0_D00/
SMC0_D15/SPI2_SS
U33
Low
1
SPIFLASH_D2_EN
SPI flash D2
U4 PB_13/ SPI2_D2 /
UART1_RTS/
TRACE0_D02/
SMC0_D13
U33
Low
2
SPIFLASH_D3_EN
SPI flash D3
U5 PB_14/ SPI2_D3 /
UART1_CTS/
TRACE0_D01/
SMC0_D14
U33
Low
3
RF_SPI2_SEL1_EN
RF wireless SPI chip
select
U28 PB_15/ SPI2_SEL1 /
TRACE0_D00/
SMC0_D15/SPI2_SS
J3
High