GR740-UM-DS, Nov 2017, Version 1.7
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GR740
36.2.1 AHB statistics
The core will generate events that can be monitored with the LEON statistics unit (L4STAT). The sta-
tistical outputs can be filtered by the AHB trace buffer filters, this is controlled by the Performance
counter Filter bit (PF) in the AHB trace buffer control register. The core can collect data for the events
listed in table 565 below
Table 565.
AHB events
Event
Description
Note
idle
HTRANS=IDLE
Active when HTRANS IDLE is driven on the AHB slave inputs and
slave has asserted HREADY.
busy
HTRANS=BUSY
Active when HTRANS BUSY is driven on the AHB slave inputs and
slave has asserted HREADY.
nseq
HTRANS=NONSEQ
Active when HTRANS NONSEQ is driven on the AHB slave inputs
and slave has asserted HREADY.
seq
HTRANS=SEQ
Active when HTRANS SEQUENTIAL is driven on the AHB slave
inputs and slave has asserted HREADY.
read
Read access
Active when HTRANS is SEQUENTIAL or NON-SEQUENTIAL,
slave has asserted HREADY and the HWRITE input is low.
write
Write access
Active when HTRANS is SEQUENTIAL or NON-SEQUENTIAL,
slave has asserted HREADY and the HWRITE input is high.
hsize
Transfer size
Active when HTRANS is SEQUENTIAL or NON-SEQUENTIAL,
slave has asserted HREADY.
ws
Wait state
Active when HREADY input to AHB slaves is low and AMBA
response is OKAY.
retry
RETRY response
Active when master receives RETRY response
split
SPLIT response
Active when master receives SPLIT response
