參數(shù)資料
型號(hào)： μPD424210
廠商： NEC Corp.
英文描述： 16 bits CMOS Dynamic RAM with Optional EDO.(16M 同步動(dòng)態(tài)RAM)
中文描述： 16位的CMOS動(dòng)態(tài)隨機(jī)存儲(chǔ)器的任擇易都。（1,600同步動(dòng)態(tài)RAM）的
文件頁(yè)數(shù)： 5/48頁(yè)
文件大?。?/td> 351K
代理商： ΜPD424210
μ
PD424210
5
Pin name
RAS
(Row address strobe)
CAS
(Column address strobe)
A0 to A8
(Address inputs)
WE
(Write enable)
OE
(Output enable)
I/O1 to I/O16
(Data inputs/outputs)
Input/Output
Function
Input
RAS activates the sense amplifier by latching a row address and selecting a
corresponding word line.
It refreshes memory cell array of one line selected by the row address.
It also selects the following function.
CAS before RAS refresh
Input
CAS activates data input/output circuit by latching column address and
selecting a digit line connected with the sense amplifier.
Input
Address bus.
Input total 18-bit of address signal, upper 9-bit and lower 9-bit in sequence
(address multiplex method).
Therefore, one word is selected from 262,144-word by 16-bit memory cell
array.
In actual operation, latch row address by specifying row address and
activating RAS.
Then, switch the address bus to column address and activate CAS.
Each address is taken into the device when RAS and CAS are activated.
Therefore, the address input setup time (t
ASR
, t
ASC
) and hold time (t
RAH
, t
CAH
)
are specified for the activation of RAS and CAS.
Input
Write control signal.
Write operation is executed by activating RAS, CAS and WE.
Input
Read control signal.
Read operation can be executed by activating RAS, CAS and OE.
If WE is activated during read operation, OE is to be ineffective in the device.
Therefore, read operation cannot be executed.
Input/Output
16-bit data bus.
I/O1 to I/O16 are used to input/output data.
Input/Output Pin Functions
The
μ
PD424210 has input pins RAS, CAS
Note
, WE, OE, A0 to A8 and input/output pins I/O1 to
I/O16.
Note
CAS means UCAS and LCAS.
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