APEX 20K Programmable Logic Device Family Data Sheet
Figure 16. APEX 20K Parallel Expanders
From
Previous
Macrocell
Product-
Macrocell
Product-
Term Logic
Term
Select
Matrix
Parallel Expander
Switch
Product-
Term
Select
Matrix
Macrocell
Product-
Term Logic
Parallel Expander
Switch
32 Signals from
Local Interconnect
To Next
Macrocell
The ESB can implement various types of memory blocks, including
dual-port RAM, ROM, FIFO, and CAM blocks. The ESB includes input
and output registers; the input registers synchronize writes, and the
output registers can pipeline designs to improve system performance. The
ESB offers a dual-port mode, which supports simultaneous reads and
writes at two different clock frequencies. Figure 17 shows the ESB block
diagram.
Embedded
System Block
Figure 17. ESB Block Diagram
wraddress[]
data[]
rdaddress[]
q[]
wren
rden
inclock
inclocken
inaclr
outclock
outclocken
outaclr
Altera Corporation
29
ETC [ ETC ]
