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EMC646SP16JS-45L Datasheet(PDF) 27 Page - Emerging Memory & Logic Solutions Inc

Part # EMC646SP16JS-45L
Description  4Mx16 bit CellularRAM
PDF  65 Pages
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Manufacturer  EMLSI [Emerging Memory & Logic Solutions Inc]
Direct Link  http://www.emlsi.com
Logo EMLSI - Emerging Memory & Logic Solutions Inc

EMC646SP16JS-45L Datasheet(HTML) 27 Page - Emerging Memory & Logic Solutions Inc

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EMC646SP16J
4Mx16 CellularRAM
27
Preliminary
Refresh Configuration Register
The refresh configuration register (RCR) defines how the CellularRAM device performs its transparent self refresh. Altering the refresh
parameters can dramatically reduce current consumption during standby mode. Page mode control is also embedded into the RCR. Fig-
ure 20 describes the control bits used in the RCR. At power-up, the RCR is set to 0010h. The RCR is accessed with CRE HIGH and
A[19:18] = 00b; or through the register access software sequence with DQ = 0000h on the third cycle.
Figure 20: Refresh Configuration Register Mapping
Address Bus
A[21:20]
A[19:18]
A[17:8]
A7
A6
A5
A4
A3
A2
A1
A0
21-20
19-18
17-8
7
6
5
4
3
2
1
0
Reserved
Register Select
Reserved
Page
Reserved
DPD
Reserved
PAR
RCR[19]
RCR[18]
Register Select
RCR[2]
RCR[1]
RCR[0]
Refresh Coverage
0
0
Select RCR
0
0
0
Full array (default)
1
0
Select BCR
0
0
1
Bottom 1/2 array
0
1
Select DIDR
0
1
0
Bottom 1/4 array
0
1
1
Bottom 1/8 array
1
0
0
None of array
RCR[7]
Page Mode Enable/Disable
1
0
1
Top 1/2 array
0
Page Mode Disable (default)
1
1
0
Top 1/4 array
1
Page Mode Enable
1
1
1
Top 1/8 array
RCR[4]
Deep Power-Down
0
DPD Enable
1
DPD Disable (default)
All must be
All must be
Setting is ignored
Must be set to “0”
(Default 00b)
set to “0”
set to “0”



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