Mixed-port read-during-write mode, Mixed-port read-during-write mode -3, Ab d e – Altera MAX 10 Embedded Memory User Manual
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Figure 3-3: Same Port Read-During-Write: Old Data Mode
clk_a
wren_a
address_a
data_a
rden_a
q_a (asynch)
a0
a1
A
B
C
D
E
F
a0(old data)
a1(old data)
A
B
D
E
Mixed-Port Read-During-Write Mode
The mixed-port read-during-write mode applies to simple and true dual-port RAM modes where two
ports perform read and write operations on the same memory address using the same clock—one port
reading from the address, and the other port writing to it.
Table 3-2: Output Modes for RAM in Mixed-Port Read-During-Write Mode
Output Mode
Description
"old data"
A read-during-write operation to different ports causes the RAM
output to reflect the “old data” value at the particular address.
"don't care"
The RAM outputs “don’t care” or “unknown” value.
UG-M10MEMORY
2015.05.04
Mixed-Port Read-During-Write Mode
3-3
MAX 10 Embedded Memory Design Consideration
Altera Corporation