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IS45S32800G-6BLA1 Datasheet(PDF) 2 Page - Integrated Silicon Solution, Inc

Part # IS45S32800G-6BLA1
Description  256Mb SYNCHRONOUS DRAM
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Manufacturer  ISSI [Integrated Silicon Solution, Inc]
Direct Link  http://www.issi.com
Logo ISSI - Integrated Silicon Solution, Inc

IS45S32800G-6BLA1 Datasheet(HTML) 2 Page - Integrated Silicon Solution, Inc

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Integrated Silicon Solution, Inc. - www.issi.com
Rev. A
07/18/2012
IS42S32800G, IS45S32800G
DEVICE OVERVIEW
The 256Mb SDRAM is a high speed CMOS, dynamic
random-accessmemorydesignedtooperatein3.3VVdd
and3.3VVddq memorysystemscontaining268,435,456
bits.Internallyconfiguredasaquad-bankDRAMwitha
synchronousinterface.Each67,108,864-bitbankisorga-
nizedas4,096rowsby512columnsby32bits.
The256MbSDRAMincludesanAUTOREFRESHMODE,
and a power-saving, power-down mode. All signals are
registeredonthepositiveedgeoftheclocksignal,CLK.
AllinputsandoutputsareLVTTLcompatible.
The256MbSDRAMhastheabilitytosynchronouslyburst
data at a high data rate with automatic column-address
generation, the ability to interleave between internal banks
to hide precharge time and the capability to randomly
change column addresses on each clock cycle during
burst access.
A self-timed row precharge initiated at the end of the burst
sequenceisavailablewiththeAUTOPRECHARGEfunction
enabled. Precharge one bank while accessing one of the
other three banks will hide the precharge cycles and provide
seamless, high-speed, random-access operation.
SDRAM read and write accesses are burst oriented starting
at a selected location and continuing for a programmed
number of locations in a programmed sequence.The
registration of an ACTIVE command begins accesses,
followedbyaREADorWRITEcommand.TheACTIVE
command in conjunction with address bits registered are
usedtoselectthebankandrowtobeaccessed(BA0,
BA1selectthebank;A0-A11selecttherow).TheREAD
or WRITE commands in conjunction with address bits
registered are used to select the starting column location
for the burst access.
ProgrammableREADorWRITEburstlengthsconsistof
1,2,4and8locationsorfullpage,withaburstterminate
option.
CLK
CKE
CS
RAS
CAS
WE
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
BA0
BA1
A10
COMMAND
DECODER
&
CLOCK
GENERATOR
MODE
REGISTER
REFRESH
CONTROLLER
REFRESH
COUNTER
SELF
REFRESH
CONTROLLER
ROW
ADDRESS
LATCH
COLUMN
ADDRESS LATCH
BURST COUNTER
COLUMN
ADDRESS BUFFER
COLUMN DECODER
DATA IN
BUFFER
DATA OUT
BUFFER
DQM0 - DQM3
DQ 0-31
VDD/VDDQ
Vss/VssQ
12
12
9
12
12
9
32
32
32
32
512
(x 32)
4096
4096
4096
4096
MEMORY CELL
ARRAY
BANK 0
SENSE AMP I/O GATE
BANK CONTROL LOGIC
ROW
ADDRESS
BUFFER
A11
4
FUNCTIONAL BLOCK DIAGRAM (FOR 2Mx32x4 BANKS)


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