ARM NIC-301 User Manual

ARM DDI 0397G

2-14

ID031010

You can configure the upsizer to support 1-32 read transactions and 1-32 write transactions. The 
issuing capability is a maximum of twice the acceptance capability.

The downsize function reduces the data width by the following ratios:
•

2:1

•

4:1

•

8:1.

The downsizer does not merge data narrower than the destination bus if the transaction is 
marked as non-cacheable.

This section describes the following:
•

•

•

•

•

The AMBA Network Interconnect converts INCR bursts that fall within the maximum payload 
size of the output data bus to a single INCR. It converts INCR bursts that are greater than the 
maximum payload size of the output data bus to multiple INCR bursts. Table 2-5 shows how the 
network converts INCR bursts when it downsizes them.

INCR bursts with a size that matches the output data width pass through unconverted.

The AMBA Network Interconnect packs INCR bursts with a SIZE smaller than the output data 
width to match the output width whenever possible, using the upsize transfer function. See 
Upsizing data width function on page 2-12.

The AMBA Network Interconnect always converts WRAP bursts to WRAP bursts of twice the 
length, up to the output data width maximum size of WRAP16, in which case, it treats the 
WRAP burst as two INCR bursts that can each map onto one or more INCR bursts.

Aligned INCR4

INCR8

Unaligned INCR4

INCR7

Aligned INCR9

INCR15 + INCR2