MPC8544COMEDEV Freescale Semiconductor, MPC8544COMEDEV Datasheet - Page 119

• Manufacturer Part Number: MPC8544COMEDEV
• Description: KIT DEV EXPRESS MPC8544COM
• Manufacturer: Freescale Semiconductor
• Type: MPUr

Specifications of MPC8544COMEDEV

• Contents: Board
• For Use With/related Products: MPC8544
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

windows are provided. The ATMUs allows the MPC8544E to be part of larger address maps such as the
PCI or PCI Express 64-bit address environment.
1.3.21
When processing across the on-chip fabric, the ATMUs at each fabric port are used to determine the flow
of data across the MPC8544E. The ATMUs at each fabric port are responsible for generating a fabric port
destination ID as well as a new local device address. The port ID and local address are based on the
programmed destination of the transaction. The following is a general overview of how the ATMUs
process transactions over the on-chip fabric (refer to
1.3.22
Processing via the ECM is similar to processing across the on-chip fabric (in the sense of how data is
received and transmitted) with the exception that the transaction passes through the ECM. The purpose of
the ECM is to provide a means for any I/O transaction to maintain coherency with the cacheable DDR
SDRAM and the local bus memory. However, simply because the ECM is used does not make transactions
across it coherent. The e500 core and L2 cache are snooped to maintain coherency only if the transaction
across the ECM is designated as global (GBL bit set). Otherwise, the transaction passes through the ECM
using the ECM as a simple conduit to get to its destination. In essence, only global transactions across the
ECM are coherent transactions; all others (across the on-chip fabric) are non-coherent.
1.4
The MPC8544E is a very flexible device and can be configured to meet many system application needs.
The following section provides block diagrams of various applications.
Freescale Semiconductor
1. When a transaction on one of the fabric ports begins, the ATMU on the origination port translates
2. The data is then processed across the on-chip fabric from the origination port to the destination
3. If the destination port connects off chip (for example, to a PCI device), the local device address is
the programmed destination address into both a destination fabric port ID and a local device
address.
port.
translated by the destination port ATMU to an outbound address with respect to the destination
port’s memory map, and the data is processed accordingly.
Application Examples
Processing Across the On-Chip Fabric
Data Processing with the e500 Coherency Module
MPC8544E PowerQUICC III Integrated Host Processor Family Reference Manual, Rev. 1
Figure 1-3. Processing Transactions Across the On-Chip Fabric
ATMU
1
2
Figure
1-3).
ATMU
3
Overview
1-21