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MVME3100 Single Board Computer Installation and Use (6806800M28C)
124
7.2 MPC8540 Reset Configuration
The MVME3100 supports the power-on reset (POR) pin sampling method for MPC8540 reset
configuration. The states of the various configuration pins on the MPC8540 are sampled when
reset is de-asserted to determine the desired operating modes. The following table describes
the configuration options and the corresponding default setting. Refer to the MPC8540
Reference Manual listed in Appendix B, Related Documentation, for additional details and/or
programming information.
Table 7-1 MPC8540 Power-on Reset Configuration Settings
MPC8540 Signal Select Option
Default
Setting Description State of Bit vs Function
1
PCI_REQ64_L PLD logic 0 PCI-32 Configuration 0 PCI/PCI-X interface is 64-
bit
1 PCI/PCI-X interface is 32-
bit
PCI_GNT1_L Resistor 0 PCI Interface I/O
Impedance
025 ohm drivers
142 ohm drivers
PCI_GNT2_L Resistor 1 PCI Arbiter
Configuration
0 Disabled on-chip PCI/PCI-
X arbiter
2
1 Enabled on-chip PCI/PCI-
X arbiter
PCI_GNT3_L Resistor 1 PCI Debug
Configuration
0 PCI debug enabled
1 PCI operates in normal
mode
PCI_GNT4_L Switch 0 PCI/PCI-X
Configuration
0PCI-X mode
1PCI mode
EC_MDC Resistor 1 TSEC Width
Configuration
0 Ethernet in reduced
mode (RTBI or RGMII)
1 Ethernet in standard
mode (TBI or GMII)