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GS82583ED18 Arkusz danych(PDF) 7 Page - GSI Technology

Numer części GS82583ED18
Szczegółowy opis  288Mb SigmaQuad-IIIe??Burst of 4 SRAM
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Producent  GSI [GSI Technology]
Strona internetowa  http://www.gsitechnology.com
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GS82583ED18/36GK-675/625/550/500
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
Rev: 1.05 8/2016
7/26
© 2014, GSI Technology
DLL Operation
A DLL is implemented in these devices to control all output timing. It uses the CK input clock as a source, and is enabled when all
of the following conditions are met:
1. RST is de-asserted Low, and
2. The DLL pin is asserted High, and
3. CK cycle time
 t
KHKH (max), as specified in the AC Timing Specifications section.
Once enabled, the DLL requires 64K stable clock cycles in order to lock/synchronize properly.
When the DLL is enabled, it aligns output clocks and read data to input clocks, and it generates all mid-cycle output timing. See the
Output Timing section for more information.
The DLL can tolerate changes in input clock frequency due to clock jitter (i.e. such jitter will not cause the DLL to lose lock/
synchronization), provided the cycle-to-cycle jitter does not exceed 200ps (see “tKJITcc” in the AC Timing Specifications section
for more information). However, the DLL must be resynchronized (i.e. disabled and then re-enabled) whenever the nominal input
clock frequency is changed.
The DLL is disabled when any of the following conditions are met:
1. RST is asserted High, or
2. The DLL pin is de-asserted Low, or
3. CK is stopped for at least 30ns, or CK cycle time
 30ns.
Clock Truth Table
Previous
Operation
SA
R
W
Current Operation
D
Q
(tn–1)
CK
(tn)
CK
(tn)
CK
(tn)
(tn)
KD
(tn+1)
KD
(tn+1½)
KD
(tn+2)
KD
(tn+2½)
CQ
(tn+3)
CQ
(tn+3½)
CQ
(tn+4)
CQ
(tn+4½)
NOP
X
1
1
NOP
X
X
0 / High-Z
Write
X
1
X
NOP
D3
D4
0 / High-Z
Read
X
X
1
NOP
X
X
Q3
Q4
NOP
V
1
0
Write
D1
D2
D3
D4
0 / High-Z
Read
V
X
0
Write
D1
D2
D3
D4
Q3
Q4
NOP
V
0
X
Read
X
X
Q1
Q2
Q3
Q4
Write
V
0
X
Read
D3
D4
Q1
Q2
Q3
Q4
Notes:
1. 1 = High; 0 = Low; V = Valid; X = don’t care.
2. D1, D2, D3, and D4 indicate the first, second, third, and fourth pieces of Write Data transferred during Write operations.
3. Q1, Q2, Q3, and Q4 indicate the first, second, third, and fourth pieces of Read Data transferred during Read operations.
4. When D ODT is enabled, Q pins are driven Low for one cycle in response to NOP and Write commands, 3 cycles after the command is
sampled, except when preceded by a Read command. When D ODT is disabled, Q pins are tri-stated for one cycle in response to NOP
and Write commands, 3 cycles after the command is sampled, except when preceded by a Read command.


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