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參數(shù)資料
| 型號： | DM2212J1-12L |
| 英文描述： | Enhanced DRAM (EDRAM) |
| 中文描述： | 增強的DRAM（eDRAM內(nèi)存） |
| 文件頁數(shù)： | 1/19頁 |
| 文件大小： | 159K |
| 代理商： | DM2212J1-12L |
DM2202/2212 EDRAM
1Mbx 4 EnhancedDynamc RAM
ProductSpecifcaton
1996 Enhanced Memory Systems Inc.,
1850 Ramtron Drive, Colorado Springs, CO
Telephone
(800) 545-DRAM;
Fax
(719) 488-9095; http://wwwcsn.net/ramtron/enhanced
80921
38-2107-002
The information contained herein is subject to change wthout notice.
Enhanced reserves the right to change or discontinue this product wthout notice.
Features
I
2Kbit SRAMCache Memory for 12ns RandomReads Wthin a Page
I
Fast 4Mbit DRAMArray for 30ns Access to Any NewPage
I
Write Posting Register for 12ns RandomWrites and Burst Writes
Wthin a Page (Hit or Mss)
I
256-byte Wde DRAMto SRAMBus for 14.2 Ggabytes/Sec Cache
Fill
I
On-chip Cache Hit/Mss Comparators Maintain Cache Coherency
on Writes
I
Hidden Precharge and Refresh Cycles
I
Write-per-bit Option (DM2212) for Parity and Video Applications
I
Extended 64ms Refresh Period for LowStandby Power
I
300 Ml Plastic SOJ and TSOP-II Package Options
I
+5 and +3.3 Volt Power Supply Voltage Options
I
LowPower, Self Refresh Mode Option
I
Industrial Temperature Range Option
Description
The 4Mb Enhanced DRAM(EDRAM combines rawspeed wth
innovative architecture to offer the optimumcost-performance solution
for high performance local or systemmain memory In most high
speed applications, no-wait-state performance can be achieved wthout
secondary SRAMcache and wthout interleaving main memory banks at
systemclock speeds through 50MHz. Two-way interleave wll allowno-
wait-state operation at clock speeds greater than 100MHz wthout the
need of secondary SRAMcache. The EDRAMoutperforms conventional
SRAMcache plus DRAMmemory systems by mnimzing processor wait
states for all possible bus events, not just cache hits. The combination
of data and address latching, 2K of fast on-chip SRAMcache, and
simplified on-chip cache control allows systemlevel flexibility
performance, and overall memory cost reduction not available wth any
other high density memory component. Architectural simlarity wth
JEDEC DRAMs allows a single memory controller design to support
either slowJEDEC DRAMs or high speed EDRAMs. A systemdesigned in
this manner can provide a simple upgrade path to higher system
performance.
Archtecture
The EDRAMarchitecturehas a simple integrated SRAMcache
which allows it to operate much like a page mode or static column
DRAM
The EDRAMs SRAMcache is integrated into the DRAMarray as
tightly coupled rowregisters. Memory reads always occur fromthe
cache rowregister. When the internal comparator detects a page hit,
only the SRAMis accessed and data is available in 12ns fromcolumn
address. When a page read mss is detected, the newDRAMrowis
loaded into the cache and data is available at the output all wthin
30ns fromrowenable. Subsequent reads wthin the page (burst reads
or randomreads) can continue at 12ns cycle time. Since reads occur
fromthe SRAMcache, the DRAMprecharge can occur simultaneously
wthout degrading performance. The on-chip refresh counter wth
independent refresh bus allows the EDRAMto be refreshed during
cache reads.
Memory writes are internally posted in 12ns and directed to the
DRAMarray During a write hit, the on-chip address comparator
activates a parallel write path to the SRAMcache to maintain
/CAL
A
0-10
W/R
/F
/RE
V
V
Sense Amps
& Column Write Select
Column Decoder
Row
Add
Latch
CC
SS
512 X 4 Cache (Row Register)
Memory
Array
(2048 X 512 X 4)
A
0-8
/G
/S
/WE
DQ
0-3
Column
Add
Latch
11 Bit
Comp
Last
Row
Read
Add
Latch
I/O
Control
and
Data
Latches
Refresh
Counter
R
Row Add
and
Refresh
Control
A
0-9
Functional Dagram
SO Pin
Configuration
TSOP-II Pin
Configuration
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
V
SS *
V
SS
V
SS
DQ
0
DQ
1
DQ
2
NC
DQ
3
/G
V
CC
V
CC
V
SS
V
SS
/WE
/S
/F
NC
W/R
NC
/CAL
A
10
NC
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
NC
A
0
NC
A
1
NC
A
3
A
4
NC
A
5
/RE
V
CC
V
SS
V
SS
A
6
A
7
A
8
NC
A
2
NC
A
9
V
CC
V
CC*
* Reserved for future use
1
2
3
4
5
6
7
9
10
11
12
13
26
25
24
23
22
21
20
18
17
16
15
14
A
A
1
A
3
A
4
A
5
/RE
V
CC
V
SS
A
6
A
7
A
8
A
2
A
9
V
CC
8
19
27
28
0
V
SS
DQ
DQ
1
DQ
2
DQ
3
/WE
/S
/F
W/R
/CAL
A
10
/G
V
CC
V
SS
0
Enhanced
Memory Systems Inc.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DM2212J1-15 | Enhanced DRAM (EDRAM) |
| DM2212J1-15I | Enhanced DRAM (EDRAM) |
| DM2212J1-15L | Enhanced DRAM (EDRAM) |
| DM2200J1-12 | Enhanced DRAM (EDRAM) |
| DM2200J1-12I | Enhanced DRAM (EDRAM) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DM2212J1-15 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Enhanced DRAM (EDRAM) |
| DM2212J1-15I | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Enhanced DRAM (EDRAM) |
| DM2212J1-15L | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Enhanced DRAM (EDRAM) |
| DM2212J-12 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Enhanced DRAM (EDRAM) |
| DM2212J-12I | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Enhanced DRAM (EDRAM) |
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