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UPD45128163-A75L 数据表(PDF) 9 Page - Elpida Memory

部件名 UPD45128163-A75L
功能描述  128M-bit Synchronous DRAM 4-bank, LVTTL
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制造商  ELPIDA [Elpida Memory]
网页  http://www.elpida.com/en
标志 ELPIDA - Elpida Memory

UPD45128163-A75L 数据表(HTML) 9 Page - Elpida Memory

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Data Sheet E0344N10 (Ver. 1.0)
9
µµµµPD45128163
2. Commands
Mode register set command
(/CS, /RAS, /CAS, /WE = Low)
The
µPD45128xxx has a mode register that defines how the device
operates. In this command, A0 through A11, BA0(A13) and BA1(A12)
are the data input pins.
After power on, the mode register set
command must be executed to initialize the device.
The mode register can be set only when all banks are in idle state.
During 2 CLK (tRSC) following this command, the
µPD45128xxx
cannot accept any other commands.
Fig.1 Mode register set command
/WE
/CAS
/RAS
/CS
CKE
CLK
H
Add
A10
BA0(A13), BA1(A12)
Activate command
(/CS, /RAS = Low, /CAS, /WE = High)
The
µPD45128xxx has four banks, each with 4,096 rows.
This command activates the bank selected by BA0(A13) and
BA1(A12) and a row address selected by A0 through A11.
This command corresponds to a conventional DRAM’s /RAS falling.
Fig.2 Row address strobe and
bank activate command
/WE
/CAS
/RAS
/CS
CKE
CLK
H
Add
A10
BA0(A13), BA1(A12)
Row
Row
Precharge command
(/CS, /RAS, /WE = Low, /CAS = High)
This command begins precharge operation of the bank selected by
BA0(A13) and BA1(A12). When A10 is High, all banks are
precharged, regardless of BA0(A13) and BA1(A12). When A10 is
Low, only the bank selected by BA0(A13) and BA1(A12) is
precharged.
After this command, the
µPD45128xxx can’t accept the activate
command to the precharging bank during tRP (precharge to activate
command period).
This command corresponds to a conventional DRAM’s /RAS rising.
Fig.3 Precharge command
/WE
/CAS
/RAS
/CS
CKE
CLK
H
Add
A10
BA0(A13), BA1(A12)
(Precharge select)


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