FEDS82V16520A-01
OKI Semiconductor
MS82V16520A
PIN DESCRIPTION
CLK
CS
Fetches all inputs at the "H" edge.
Disables or enables device operation by asserting or deactivating all inputs except CLK, CKE,
DQM0, DQM1, DQM2 and DQM3.
Masks system clock to deactivate the subsequent CLK operation.
If CKE is deactivated, system clock will be masked so that the subsequent CLK operation is
deactivated. CKE should be asserted at least one cycle prior to a new command.
Row & column multiplexed.
Row address: RA0 to RA9,
Column address: CA0 to CA7
CKE
Address
BA
RAS
CAS
WE
Selects bank to be activated during row address latch time and selects bank for precharge and
read/write during column address latch time.
BA = “L”: Bank A
BA = “H”: Bank B
Functionality depends on the combination. For details, see the function truth table.
Masks the read data of two clocks later when DQM0 to DQM3 are set "H" at the "H" edge of the
clock signal.
Masks the write data of the same clock when DQM0 to DQM3 are set "H" at the "H" edge of the
clock signal.
DQM0 controls DQ0 to DQ7, DQM1 controls DQ8 to DQ15, DQM2 controls DQ16 to DQ23, and
DQM3 controls DQ24 to DQ31.
Data inputs/outputs are multiplexed on the same pin.
DQM0 to
DQM3
DQ0 to
DQ31
*Notes: 1. When
CS
is set "High" at a clock transition from "Low" to "High", all inputs except CLK, CKE,
DQM0, DQM1, DQM2, and DQM3 are invalid.
2. When issuing an active, read or write command, the bank is selected by BA.
BA
0
1
Active, read or write
Bank A
Bank B
3. The auto precharge function is enabled or disabled by the A9 input when the read or write
command is issued.
A9
0
1
0
1
BA
0
0
1
1
Operation
After the end of burst, bank A holds the active status.
After the end of burst, bank A is prechaged automatically.
After the end of burst, bank B holds the active status.
After the end of burst, bank B is prechaged automatically.
4. When issuing a precharge command, the bank to be precharged is selected by the A9 and
BA inputs.
A9
0
0
1
BA
0
1
×
Operation
Bank A is precharged.
Bank B is precharged.
Both banks are precharged.
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