Publication No. SBC329-HRM/1
Functional Description 67
5.17.1
EEPROM DIP Switch
A PCA9560 device is used to configure the following aspects of board operation:
Table 5-17 DIP Switch Options
Internal Register
and Bit
Output
(Datasheet Name)
Function
REG0 bit 0
MUX_A
Boot SPI select:
0 = Boot from main SPI site
1 = Boot from FSP SPI site
REG0 bit 1
MUX_B
COM2 interface mode:
0 = COM2 transceiver is in RS232 mode (default)
1 = COM2 transceiver is in RS422 mode
REG0 bit 2
MUX_C
ZHURe NVRAM write protect:
0 = ZHURe NVRAM is write-enabled (default)
1 = ZHURe NVRAM is write protected
REG0 bit 3
MUX_D
NVRAM write protect
0 = Writes to NVRAM are enabled whenever the NVMRO signal is inactive (default)
1 = Writes to NVRAM are disabled
REG0 bit 4
MUX_E
SSD write protect
0 = Writes to SDD are enabled whenever the NVMRO signal is inactive (default)
1 = Writes to SDD are enabled
NOTE
Setting this bit to a ‘
0
’ may cause instability if an operating system
is installed on the SSD
REG0 bit 5
NON_MUXED_OUT Backplane PCIe REFCLK enable
0 = REFCLK is not driven (default)
1= REFCLK is driven at 100 MHz
REG1 bit 0
Not connected
Run BIT (reserved for use by FSP):
0 = Boot into the FSP menu
1 = Run BIT
REG1 bit 1
Not connected
BIT Verbose mode (reserved for use by FSP):
0 = BIT Verbose mode disabled
1 = BIT Verbose mode enabled
REG1 bit 2
Not connected
BIT Fast Start mode:
0 = BIT Fast Start disabled
1 = BIT Fast Start enabled
REG1 bit 3
Not connected
Fast BIT mode
0=Fast BIT mode disabled
1=Fast BIT mode enabled
REG1 bit 4
Not connected
Not used
REG1 bit 5
Not connected
Not used
NOTE
The EEPROM DIP Switch is write-enabled only when the backplane NVMRO signal (on
) is low (inactive) and the
Configuration EEPROM Write Protect Link (P6)
The EEPROM DIP switch can be controlled using the BIOS set-up screen.
It is intended only to be used by Abaco software drivers.
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