MSC8156-EVM Hardware Getting Started, Rev. 0
6
Freescale Semiconductor
Power Switch and Push Buttons
The default DIP-switch positions define the MSC8156EVM configuration modes listed in
Table 4
.
.
6
Power Switch and Push Buttons
Table 5
lists the functioning of the MSC8156EVM power switch and push buttons.
Figure 2
on page 5
shows their location.
SW6 Configuration
SW6.1:SS0: SELECT PEX SPREAD SPECTRUM
• Default: ON (= 0 which selects NO SPREAD SPECTRUM)
SW6.2-3: S1,S0” SELECT ICS557-03 OUTPUT FREQUENCY
• Default: OFF, ON (= 10 which selects CLKOUT = 100 MHz)
SW6.4: MULTIPLEXER SELECT
• Default: OFF (= 1 which selects INTERNAL CLK).
Table 4.
MSC8156EVM Default Configuration Modes
Mode
Value
CLKIN
100 MHz
Core frequency
1000 MHz
DDR2 data rate
800 Mbps
MAPLE clock
450 MHz
QUICC Engine
Subsystem clock
500 MHz
PCI Express interface
output rate
2.5 Gbps
Table 5. Power Switch and Push Button Functionality
Push Button
Position
Description & Default
S1: ON/OFF
Power switch. The ON position activates the external power supply. The OFF
position connects power from the PCI Express edge-connector, which supplies 12
V power if the PCI-Express external board is connected and powered.
SW1: NMI
Pressing this switch assert an NMI and aborts program execution.
SW3: HRST
Press to assert HRESET.
SW4: IRQ0
Press to assert IRQ0 to the board.
Table 3. MSC8156EVM DIP-Switch Configurations (continued)
4
MUX ELECT
S0
S1
ON ‘0’
SS0
1
