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EM636165-XXI View Datasheet(PDF) - Etron Technology

Part NameEM636165-XXI Etron
Etron Technology Etron
Description1Mega x 16 Synchronous DRAM (SDRAM)
EM636165-XXI Datasheet PDF : 73 Pages
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EtronTech
1M x 16 SDRAM EM636165-XXI
Test Mode field (A8~A7)
These two bits are used to enter the test mode and must be programmed to "00" in normal
operation.
A8 A7
Test Mode
0
0
normal mode
0
1
Vendor Use Only
1
X
Vendor Use Only
Single Write Mode (A9)
This bit is used to select the write mode. When the BS bit is "0", the Burst-Read-Burst-
Write mode is selected. When the BS bit is "1", the Burst-Read-Single-Write mode is
selected.
A9
Single Write Mode
0
Burst-Read-Burst-Write
1
Burst-Read-Single-Write
Note: A10 and A11 should stay Lduring mode set cycle.
8 No-Operation command
(RAS# = "H", CAS# = "H", WE# = "H")
The No-Operation command is used to perform a NOP to the SDRAM which is selected (CS#
is Low). This prevents unwanted commands from being registered during idle or wait states.
9 Burst Stop command
(RAS# = "H", CAS# = "H", WE# = "L")
The Burst Stop command is used to terminate either fixed-length or full-page bursts. This
command is only effective in a read/write burst without the auto precharge function. The terminated
read burst ends after a delay equal to the CAS# latency (refer to the following figure). The
termination of a write burst is shown in the following figure.
T0
T1
T2
T3
T4
T5
T6
T7
T8
CLK
COMMAND
READ A
NOP
NOP
NOP
Burst Stop
NOP
NOP
NOP
NOP
CAS# latency=1
tCK1, DQ's
DOUT A0 DOUT A1
DOUT A2 DOUT A3
The burst ends after a delay equal to the CAS# latency.
CAS# latency=2
tCK2, DQ's
DOUT A0 DOUT A1
DOUT A2 DOUT A3
CAS# latency=3
tCK3, DQ's
DOUT A0 DOUT A1
DOUT A2 DOUT A3
Termination of a Burst Read Operation (Burst Length 4, CAS# Latency = 1, 2, 3)
Preliminary
14
Rev. 1.1 Apr. 2005
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