IGLOO nano DC and Switching Characteristics
2-84 Revision 17
Figure 2-38 • FIFO FULL Flag and AFULL Flag Assertion
Figure 2-39 • FIFO EMPTY Flag and AEMPTY Flag Deassertion
Figure 2-40 • FIFO FULL Flag and AFULL Flag Deassertion
NO MATCH NO MATCH Dist = AFF_TH MATCH (FULL)
t
CKAF
t
WCKFF
t
CYC
WCLK
FULL
AFULL
WA/RA
(Address Counter)
WCLK
WA/RA
(Address Counter)
MATCH
(EMPTY)
NO MATCH NO MATCH NO MATCH
Dist = AEF_TH + 1
NO MATCH
RCLK
EMPTY
1st Rising
Edge
After 1st
Write
2nd Rising
Edge
After 1st
Write
t
RCKEF
t
CKAF
AEMPTY
Dist = AFF_TH – 1
MATCH (FULL)
NO MATCH
NO MATCH
NO MATCH
NO MATCH
t
WCKF
t
CKAF
1st Rising
Edge
After 1st
Read
1st Rising
Edge
After 2nd
Read
RCLK
WA/RA
(Address Counter)
WCLK
FULL
AFULL