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MVME3100 Single Board Computer Installation and Use (6806800M28C)
136
7.12 PCI Arbitration Assignments
The integrated PCI/X arbiters internal to the MPC8540 and the PCI6520 bridges provide PCI
arbitration for the MVME3100. The MPC8540 provides arbitration support for itself and the
four PCI-X devices on PCI bus A.
The PCI6520 secondary PCI/X interface arbiters support external bus masters in addition to the
PCI6520. One secondary arbiter provides arbitration for the PMC sites on PCI bus B, and the
other provides arbitration for the PMCspan and USB host controller on PCI bus C.
The arbitration assignments on the MVME3100 are shown in the follow table so that software
may set arbiter priority assignments if necessary.
7.13 Clock Distribution
The clock function generates and distributes all of the clocks required for system operation.
The clock tree is designed in such a manner as to maintain the strict edge-to-edge jitter and
low clock-to-clock skew required by the devices. Additional clocks required by individual
devices are generated near the devices using individual oscillators. Table 7-10 on page 137 lists
Table 7-9 PCI Arbitration Assignments
PCI Bus Arbitration Assignment PCI Master(s)
A MPC8540 PCI_REQ/GNT[0] sATA Controller
A MPC8540 PCI_REQ/GNT[1] TSI148 VME Controller
A MPC8540 PCI_REQ/GNT[2] PCI6520 (Bus A to Bus B bridge)
A MPC8540 PCI_REQ/GNT[3] PCI6520 (Bus A to Bus C bridge)
B PCI6520-1 S_REQ/GNT[0] PMC site 1 primary master
B PCI6520-1 S_REQ/GNT[1] PMC site 1 secondary master
B PCI6520-1 S_REQ/GNT[2] PMC site 2 primary master
B PCI6520-1 S_REQ/GNT[3] PMC site 2 secondary master
C PCI6520-2 S_REQ/GNT[0] USB Controller
C PCI6520-2 S_REQ/GNT[1] PMCspan