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EDS1232AATA-75L-E Datasheet(PDF) 37 Page - Elpida Memory

Part # EDS1232AATA-75L-E
Description  128M bits SDRAM (4M words x 32 bits)
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Manufacturer  ELPIDA [Elpida Memory]
Direct Link  http://www.elpida.com/en
Logo ELPIDA - Elpida Memory

EDS1232AATA-75L-E Datasheet(HTML) 37 Page - Elpida Memory

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EDS1232AATA
Data Sheet E0386E40 (Ver. 4.0)
37
Read with auto precharge to Write command interval
1. Different bank: When some banks are in the active state, the second write command (another bank) is executed.
However, DQM must be set High so that the output buffer becomes High-Z before data input. The internal auto-
precharge of one bank starts at the next clock of the second command.
CLK
Command
BS
DQ (output)
DQ (input)
CL = 2
CL = 3
READA
WRIT
in B0
in B1
in B2
in B3
BL = 4
bank0
ReadA
bank3
Write
Note: Internal auto-precharge starts at the timing indicated by "
".
DQM
High-Z
Read with Auto Precharge to Write Command Interval (Different bank)
2. Same bank: The consecutive write command from read with auto precharge (the same bank) is illegal. It is
necessary to separate the two commands with a bank active command.
Write with auto precharge to Read command interval
1. Different bank: When some banks are in the active state, the second read command (another bank) is executed.
However, in case of a burst write, data will continue to be written until one clock before the read command is
executed. The internal auto-precharge of one bank starts at 2 clocks later from the second command.
CLK
Command
BS
DQ (output)
DQ (input)
WRITA
READ
out B0
out B1
out B2
out B3
CL = 3
BL = 4
bank0
WriteA
bank3
Read
Note: Internal auto-precharge starts at the timing indicated by "
".
DQM
in A0
Write with Auto Precharge to Read Command Interval (Different bank)
2. Same bank: The consecutive read command from write with auto precharge (the same bank) is illegal. It is
necessary to separate the two commands with a bank active command.


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