Signal Descriptions

The signals present on the pins labeled A[31:0], B[31:0], and C[31:0] are described in Table A-1.

Table A-1 Bus bit assignment (for an AMBA ASB bus )

Pin label

Name (ASB)

Description

 

 

 

A[31:0]

System address bus

System address bus

 

 

 

B[31:0]

Not used

-

 

 

 

C[31:0]

System control bus

See remainder of table.

 

 

 

C[31:16]

Not used

-

 

 

 

C15

BLOK

Locked transaction

 

 

 

C14

BLAST

Last response

 

 

 

C13

BERROR

Error response

 

 

 

C12

BWAIT

Wait response

 

 

 

C11

BWRITE

Write transaction

 

 

 

C10

Not used

-

 

 

 

C[9:8]

BPROT[1:0]

Transaction protection type

 

 

 

C7

Not used

-

 

 

 

C[6:5]

BURST[1:0]

Transaction burst size

 

 

 

C4

Not used

-

 

 

 

C[3:2]

BSIZE[1:0]

Transaction width

 

 

 

C[1:0]

BTRAN[1:0]

Transaction type

 

 

 

D[31:0]

System data bus

System data bus

 

 

 

Note

Table A-1shows signal descriptions for an AMBA ASB bus implementation.

ARM DUI 0125A

© Copyright ARM Limited 1999. All rights reserved.

A-3