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EDS1232AATA-75 Datasheet(PDF) 10 Page - Elpida Memory

Part # EDS1232AATA-75
Description  128M bits SDRAM
Download  53 Pages
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Manufacturer  ELPIDA [Elpida Memory]
Direct Link  http://www.elpida.com/en
Logo ELPIDA - Elpida Memory

EDS1232AATA-75 Datasheet(HTML) 10 Page - Elpida Memory

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EDS1232AATA
Data Sheet E0386E60 (Ver. 6.0)
10
Pin Function
CLK (input pin)
CLK is the master clock input. Other inputs signals are referenced to the CLK rising edge.
CKE (input pins)
CKE determine validity of the next CLK (clock). If CKE is high, the next CLK rising edge is valid; otherwise it is
invalid. If the CLK rising edge is invalid, the internal clock is not issued and the Synchronous DRAM suspends
operation.
When the Synchronous DRAM is not in burst mode and CKE is negated, the device enters power down mode.
During power down mode, CKE must remain low.
/CS (input pins)
/CS low starts the command input cycle. When /CS is high, commands are ignored but operations continue.
/RAS, /CAS, and /WE (input pins)
/RAS, /CAS and /WE have the same symbols on conventional DRAM but different functions. For details, refer to the
command table.
A0 to A11 (input pins)
Row Address is determined by A0 to A11 at the CLK (clock) rising edge in the active command cycle.
Column Address is determined by A0 to A7 at the CLK rising edge in the read or write command cycle.
A10 defines the precharge mode. When A10 is high in the precharge command cycle, all banks are precharged;
when A10 is low, only the bank selected by BA0 and BA1 is precharged.
When A10 is high in read or write command cycle, the precharge starts automatically after the burst access.
BA0 and BA1 (input pin)
BA0 and BA1 are bank select signal. (See Bank Select Signal Table)
[Bank Select Signal Table]
BA0
BA1
Bank 0
L
L
Bank 1
H
L
Bank 2
L
H
Bank 3
H
H
Remark:
H: VIH. L: VIL.
DQM (input pins)
DQM controls I/O buffers. DQM0 controls DQ0 to DQ7, DQM1 controls DQ8 to DQ15, DQM2 controls DQ16 to
DQ23, DQM3 controls DQ24 to DQ31. In read mode, DQM controls the output buffers like a conventional /OE pin.
DQM high and DQM low turn the output buffers off and on, respectively. The DQM latency for the read is two clocks.
In write mode, DQM controls the word mask. Input data is written to the memory cell if DQM is low but not if DQM is
high. The DQM latency for the write is zero.
DQ0 to DQ31 (input/output pins)
DQ pins have the same function as I/O pins on a conventional DRAM.
VDD, VSS, VDDQ, VSSQ (Power supply)
VDD and VSS are power supply pins for internal circuits. VDDQ and VSSQ are power supply pins for the output
buffers.


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