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MC-458CA727 Datasheet(PDF) 10 Page - NEC

Part # MC-458CA727
Description  8M-WORD BY 72-BIT SYNCHRONOUS DYNAMIC RAM MODULE UNBUFFERED TYPE
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

MC-458CA727 Datasheet(HTML) 10 Page - NEC

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Data Sheet M14278EJ3V0DS00
10
MC-458CA727
Serial PD
(1/2)
Byte No.
Function Described
Hex
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Notes
0
Defines the number of bytes written into
80H
100000
00
128 bytes
serial PD memory
1
Total number of bytes of serial PD memory
08H
000010
00
256 bytes
2
Fundamental memory type
04H
000001
00
SDRAM
3
Number of rows
0CH
000011
00
12 rows
4
Number of columns
09H
000010
01
9 columns
5
Number of banks
01H
000000
01
1 bank
6
Data width
48H
010010
00
72 bits
7
Data width (continued)
00H
000000
00
0
8
Voltage interface
01H
000000
01
LVTTL
9
CL = 3 Cycle time
75H
011101
01
7.5 ns
10
CL = 3 Access time
54H
010101
00
5.4 ns
11
DIMM configuration type
02H
000000
10
ECC
12
Refresh rate/type
80H
100000
00
Normal
13
SDRAM width
10H
000100
00
×16
14
Error checking SDRAM width
10H
000100
00
×16
15
Minimum clock delay
01H
000000
01
1 clock
16
Burst length supported
8FH
100011
11
1, 2, 4, 8, F
17
Number of banks on each SDRAM
04H
000001
00
4 banks
18
/CAS latency supported
06H
000001
10
2, 3
19
/CS latency supported
01H
000000
01
0
20
/WE latency supported
01H
000000
01
0
21
SDRAM module attributes
00H
000000
00
22
SDRAM device attributes : General
0EH
000011
10
23
CL = 2 Cycle time
A0H
101000
00
10 ns
24
CL = 2 Access time
60H
011000
00
6 ns
25-26
00H
000000
00
27
tRP(MIN.)
14H
000101
00
20 ns
28
tRRD(MIN.)
0FH
000011
11
15 ns
29
tRCD(MIN.)
14H
000101
00
20 ns
30
tRAS(MIN.)
2DH
001011
01
45 ns
31
Module bank density
10H
000100
00
64M bytes
5
5
5
5
5
5


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