Visible to Intel only — GUID: mwh1409959281513
Ixiasoft
Visible to Intel only — GUID: mwh1409959281513
Ixiasoft
7.1.4.1. Using the Avalon® Memory Mapped Unaligned Burst Expansion Bridge
The Avalon® Memory Mapped Unaligned Burst Expansion Bridge then determines whether the final word requested by the host is the last word at the agent read burst address. If a single agent address contains multiple words, all those words must be requested for a single read burst transaction to occur.
- If the final word requested by the host is the last word at the agent read burst address, the bridge does not modify the burst length of the read burst command to the agent.
- If the final word requested by the host is not the last word at the agent read burst address, the bridge increases the burst length of the read burst command to the agent. The final word requested by the modified read burst command is then the last word at the agent read burst address.
The bridge stores information about each aligned read burst command that it sends to agents connected to a host interface. When a read response is received on the host interface, the bridge determines if the base address or burst length of the issued read burst command was altered.
If the bridge alters either the base address or the burst length of the issued read burst command, it receives response words that the host did not request. The bridge suppresses words that it receives from the aligned burst response that are not part of the original read burst command from the host.