Table of Contents
Advertisement
Programming Details
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.
Table 7-9 PCI Arbitration Assignments
PCI Bus
Arbitration Assignment
A
MPC8540 PCI_REQ/GNT[0]
A
MPC8540 PCI_REQ/GNT[1]
A
MPC8540 PCI_REQ/GNT[2]
A
MPC8540 PCI_REQ/GNT[3]
B
PCI6520-1 S_REQ/GNT[0]
B
PCI6520-1 S_REQ/GNT[1]
B
PCI6520-1 S_REQ/GNT[2]
B
PCI6520-1 S_REQ/GNT[3]
C
PCI6520-2 S_REQ/GNT[0]
C
PCI6520-2 S_REQ/GNT[1]
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.
136
PCI Master(s)
sATA Controller
TSI148 VME Controller
PCI6520 (Bus A to Bus B bridge)
PCI6520 (Bus A to Bus C bridge)
PMC site 1 primary master
PMC site 1 secondary master
PMC site 2 primary master
PMC site 2 secondary master
USB Controller
PMCspan
MVME3100 Single Board Computer Installation and Use (6806800M28C)
Table 7-10 on page 137
lists
Advertisement
Table of Contents
