ARM AMBA NIC-301 ユーザーズマニュアル

ARM DDI 0397G

2-5

ID031010

If you configure 

INCR promotion and Early Write Response

 and do not configure 

allow broken 

bursts

 then the network converts all:

•

AHB read fixed length bursts to AXI fixed length bursts.

•

AHB write fixed length bursts with HPROT[3] asserted to AXI fixed length bursts:
—

All AHB write data beats receive an automatic OKAY response from the bridge 
irrespective of the B-channel AXI response. This means that if the network receives 
an error response, it does not feed it back to the master.

—

The bridge can support up to five outstanding write accesses.

•

Write fixed-length bursts with HPROT[3] negated to AXI fixed length bursts, and only 
the last AHB write data beat receives the AXI buffered response for the complete AHB 
transaction.

•

AHB read INCR bursts with HPROT[3] asserted to AXI INCR4 bursts.

•

Write INCR bursts with HPROT[3] asserted to AXI INCR4 bursts, and all AHB write 
data beats receive an automatic OKAY response from the bridge, irrespective of the 
B-channel AXI response. This means that if the network receives an error response, it 
does not feed it back to the master.

•

Read INCR bursts with HPROT[3] negated to a series of AXI singles.

•

Write INCR bursts with HPROT[3] negated to a series of AXI singles, and each AHB 
write beat is acknowledged with the AXI buffered write response.

If you configure 

allow broken bursts

 and do not configure 

INCR promotion and Early Write 

Response

, the network converts all:

•

Read fixed length bursts with HPROT[3] asserted to AXI fixed length bursts.

•

Read fixed length bursts with HPROT[3] negated to AXI singles.

•

Write fixed length bursts with HPROT[3] asserted to AXI fixed length bursts, but only 
the last AHB write data beat receives the AXI buffered response for the whole AHB 
transaction. However, if the AHB burst is broken, then the network does not feed the AXI 
response back to the master.

•

Write fixed length bursts with HPROT[3] negated to AXI singles, and each AHB write 
beat is acknowledged with the AXI buffered write response.

•

Read INCR bursts to a series of AXI singles.

•

Write INCR bursts to a series of AXI singles, and each AHB write beat is acknowledged 
with the AXI buffered write response.

If you configure 

INCR promotion and Early Write Response

 and configure 

allow broken bursts

 

then the network converts all:

•

Read fixed length bursts with HPROT[3] asserted to AXI fixed length bursts.

•

Read fixed length bursts with HPROT[3] negated to AXI singles.