Kontron VSBC-32 - Manual (Page 64)

VSBC-32 Configuration
ID 21168, Rev. 04 Page 4 - 4 © PEP Modular Computers GmbH
4.1.2 Solder Jumpers
The following parameters are selected via solder jumpers:
• CPU/bus clock frequency (J1/J2/J3)
• Communications clock frequency (J4)
• Serial EEPROM write protection (J5)
• Connection of protective and signal Ground (J6)
• CXC interface connector pin A5 function assignment (J11)
• SRAM size (J7/J8)
Default settings are in italics.
Warning!
All solder jumpers are factory set. Alteration of their settings can
result in damage to the board. Therefore, customers must not
alter the settings of these jumpers.
Table 4-3: CPU/Bus Clock Frequency Selection
J3 J2 J1 Description
Closed Closed Open 25MHz (VSBC-32 and VSBC-32E)
Open Closed Open 33.3MHz (VSBC-32E only)
Table 4-4: Clock Frequencies, EEPROM Write Protection and GND Connection
Jumper Settings Description
J4
Open 24MHz communications clock not connected to MC68(EN)360
Closed
24MHz communications clock connected to MC68(EN)360
Note: This jumper must be set to open if the RCLK2 signal
(CXM pin C16) is required.
J5
Open EEPROM write protection disabled
Closed EEPROM write protection enabled
J6
Open Signal GND not connected to Protective GND
Closed
Signal GND connected to Protective GND
Note: If this jumper is set, care must be taken to avoid any
grounding currents.
Table 4-5: SRAM Size Selection
J7 J8 Description
1-2 1-2 1MB (VSBC-32E only)
1-3 1-3 256kB (VSBC-32 and VSBC-32E)