ARM AMBA NIC-301 - Manual (Page 19)

Functional Description
ARM DDI 0397G Copyright © 2006-2010 ARM. All rights reserved. 2-4
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Non-secure
All transactions originating from this slave interface are flagged as non-secure
transactions and cannot access secure components.
Per access
The AxPROTx signal determines the security setting of each transaction, and
the slaves that it can access.
• Support for the full AXI protocol.
Note
You can achieve a gate count reduction and a performance increase if the attached master
does not create any AXI lock transactions.
• Write acceptance capability of 1-32 transactions.
• Read acceptance capability of 1-32 transactions.
• Buffering, see FIFO and clocking function on page 2-15.
• Timing isolation:
—
from the external master
— from the infrastructure.
AHB-Lite slave interfaces
The AMBA Network Interconnect can support the full AHB-Lite protocol using either:
•
an AHB-Lite slave interface
• an AHB-Lite mirror master interface.
The following configuration options can improve AHB-Lite to AXI performance, but cannot
always be used robustly:
•
INCR promotion and Early Write Response
• allow broken bursts .
If you configure the interface as an AHB mirror master interface, you cannot configure allow
broken bursts because the AHB-Lite protocol does not permit AHB-Lite masters to break
bursts.
Table 2-1 shows the four combinations for the configuration of
INCR promotion and Early Write
Response
and
allow broken bursts
and contains links to detailed descriptions for each option.
Table 2-1 Combination of configuration parameters
INCR promotion and Early Write Response allow broken bursts Description of combination
Configured Not configured Combination 1 on page 2-5
Not configured Configured Combination 2 on page 2-5
Configured Configured Combination 3 on page 2-5
Not configured Not configured Combination 4 on page 2-6