Control signals during burst termination with BUSY transfer on AHB

TP Lin over 2 years ago

I saw that,

1. Under these circumstances, it is acceptable for the Manager to then perform a NONSEQ or IDLE transfer that then effectively terminates the undefined length burst

2. When a master uses the BUSY transfer type the address and control signals must reflect the next transfer in the burst.

But I'm confused about this case:

TIME:	T1	T2	T3	T4
HTRANS:	NSEQ	SEQ	BUSY	NSEQ
HADDR:	0x02	0x03	0x04	0x04
HWDATA:	dataA	dataB	dataC	dataC
HREADY:	1	1	1	1
HBURST:	INCR	INCR	INCR4	INCR4

HBURST is changed to INCR4 at T3, is this legal?

Top replies

Colin Campbell over 2 years ago +2 verified

This is definitely NOT legal ! You can only change "control" signals such as HWRITE, HSIZE, HPROT, HMASTLOCK and HBURST at the start of a new burst, which means either when issuing a NONSEQ or IDLE...