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EM636165VE-55 Datasheet(PDF) 9 Page - Etron Technology, Inc.

Part # EM636165VE-55
Description  1Mega x 16 Synchronous DRAM (SDRAM)
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Manufacturer  ETRON [Etron Technology, Inc.]
Direct Link  http://www.etron.com
Logo ETRON - Etron Technology, Inc.

EM636165VE-55 Datasheet(HTML) 9 Page - Etron Technology, Inc.

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EtronTech
1M x 16 SDRAM
EM636165
Preliminary
9
Rev. 1.8
Nov 2001
4
Read and AutoPrecharge command
(RAS# = "H", CAS# = "L", WE# = "H", A11 = “V”, A10 = "H", A0-A7 = Column Address)
The Read and AutoPrecharge command automatically performs the precharge operation after
the read operation. Once this command is given, any subsequent command cannot occur within a
time delay of {tRP(min.) + burst length}. At full-page burst, only the read operation is performed in this
command and the auto precharge function is ignored.
5
Write command
(RAS# = "H", CAS# = "L", WE# = "L", A11 = “V”, A10 = "L", A0-A7 = Column Address)
The Write command is used to write a burst of data on consecutive clock cycles from an active
row in an active bank. The bank must be active for at least tRCD(min.) before the Write command is
issued. During write bursts, the first valid data-in element will be registered coincident with the Write
command. Subsequent data elements will be registered on each successive positive clock edge
(refer to the following figure). The DQs remain with high-impedance at the end of the burst unless
another command is initiated. The burst length and burst sequence are determined by the mode
register, which is already programmed. A full-page burst will continue until terminated (at the end of
the page it will wrap to column 0 and continue).
CLK
COMMAND
T0
T1
T2T3T4T5
T6
T7
T8
DIN A3
NOP
WRITE A
NOP
NOP
NOP
NOP
NOP
NOP
NOP
DIN A0
DIN A1
DIN A2
DQ0 - DQ3
The first data element and the write
are registered on the same clock edge.
Extra data is masked.
don't care
Burst Write Operation (Burst Length = 4, CAS# Latency = 1, 2, 3)
A write burst without the auto precharge function may be interrupted by a subsequent Write,
BankPrecharge/PrechargeAll, or Read command before the end of the burst length. An interrupt
coming from Write command can occur on any clock cycle following the previous Write command
(refer to the following figure).
CLK
COM M AND
T0
T1
T2
T3
T4
T5T6
T7T8
DIN B2
NOP
WRITE A
NOP
NOP
NOP
NOP
NOP
WRITE B
NOP
DIN A0
DIN B0
DIN B1
DQ's
DIN B3
1 Clk Interval
Write Interrupted by a Write (Burst Length = 4, CAS# Latency = 1, 2, 3)


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