Truth Table/Functionality
Synchronous Read or Write to Memory (all inputs registered) |
|||
---|---|---|---|
|
|
|
Function |
L |
L |
High impedance (output not enabled). |
|
X |
H |
The memory location pointed to by |
|
H |
L |
|
For devices withEmbedded System Blocks (ESBs)orEmbedded Array Blocks (EABs), the lpm_ram_io
megafunction internally writes the
data to memory while the write clock is low.
Synchronous Read from Memory |
|||
---|---|---|---|
|
|
|
Function |
L |
H |
The output register is loaded with the contents of the memory location pointed to
by |
|
not |
L |
H |
No change. |
Totally asynchronous memory operations occur when neither inclock
nor outclock
is connected. The output
q
is asynchronous and reflects the data in the memory location pointed to by address[]
.
Asynchronous Memory Operations |
||
---|---|---|
|
|
Function |
L |
L |
High impedance (output not enabled). |
X |
H |
No change (No |
H |
L |
|
Note: we
does not act as a clock enable for the outclock
output clock.