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Memory Modes
In a tri-port RAM, two read address ports and one write address port are available
(two read ports and one write port).
Figure 4 shows the block diagrams of a tri-port RAM.
Figure 4. Tri-Port RAM
data[]
wraddress[]
rdaddress_a[]
rden_a
wren
qa[]
wrclock
wrclocken
rdaddress_b[]
rden_b
qb[]
rdclock
rdclocken
aclr
In single-port ROM, only one address port is available for read operation.
Figure 5 shows the block diagrams of a typical single-port ROM. The dual-port ROM
has almost similar functional ports as single-port ROM. The difference is dual-port
ROM has an additional address port for read operation.
Figure 5. Single-Port ROM
address[]
addressstall_a
inclock
inclocken
Internal Memory (RAM and ROM) User Guide
outclock
outclocken
q[]
outaclr
© November 2009 Altera Corporation