Spi Bus - Congatec conga-QEVAL/Qseven 2.0 User Manual

DIP Switch Status
ON
1
OFF
ON/
2
OFF
ON/
3
OFF
ON/
4
OFF
5.2.3

SPI Bus

The QEVAL 2.0 provides connection to the Serial Peripheral Interface (SPI) Bus via connector X8 and SO8 socket. The 8 pin SO8 socket
(connector U4) can be used for SPI EEPROM. For example, you can a 3.3V serial flash in the SO8 socket to boot the system from external
BIOS. The write protect (WP#) and hold (HOLD#) pins of the SO8 socket are internally pulled up to allow normal read/write operations.
Use DIP switch M13 to select whether to boot from the QEVAL 2.0 onboard SPI flash or from the on-module SPI flash. The yellow LED D4
glows when module boots from SPI flash onboard the QEVAL 2.0 (off-module SPI flash). The chip select (CS#) signal on the SPI EEPROM
socket is connected to the Qseven
SPI connector X8
Pin Signal Pin
1 +3.3V 2
SPI_MOSI
3 4
SPI_MISO
5 6
7 SPI_SCK
8
GND
9 10
SO8 Socket U4
Pin Signal
Chip Select Input
1
Data Output
2
Write Protect Input
3
GND
4
Copyright © 2014 congatec AG
Description
Address input A0 set to LOW
Address input A0 set to HIGH
Address input A1 set to LOW
Address input A1 set to HIGH
Address input A2 set to LOW
Address input A2 set to HIGH
Write protect set to LOW
Write protect set to HIGH
module's SPI_CS0# signal and is active only if switch 1 of DIP switch M13 is turned on.
®
Signal
+3.3V
SPI_CS0#
SPI_CS1#
N.C.
GND
Pin Signal
Data Input
5
Serial Clock Input
6
7 Hold Input
8 VCC
SW1
O
1
Default Settings:
N
2
ALL ON
3
4
SPI Header
(X8)
2 4 6 8
1 3 5 7
U4
EEPROM SO8 Socket
QEV2m11
U6
EEPROM Socket
10
9
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