MC-458CB646 Datasheet, PDF (10/16 Pages) NEC – 8M-WORD BY 64-BIT SYNCHRONOUS DYNAMIC RAM MODULE UNBUFFERED TYPE

MC-458CB646
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 1 0 0 0 0 0 0 0 128 bytes
serial PD memory
1 Total number of bytes of serial PD memory
08H 0
0
0
0
1
0
0
0 256 bytes
2 Fundamental memory type
3 Number of rows
4 Number of columns
5 Number of banks
6 Data width
E7 Data width (continued)
8 Voltage interface
9 CL = 3 Cycle time
O_{10 CL = 3 Access time}
L ^{11 DIMM configuration type}
04H 0 0 0 0 0 1 0 0 SDRAM
0CH 0 0 0 0 1 1 0 0 12 rows
09H 0 0 0 0 1 0 0 1 9 columns
01H 0 0 0 0 0 0 0 1 1 bank
40H 0 1 0 0 0 0 0 0 64 bits
00H 0 0 0 0 0 0 0 0 0
01H 0 0 0 0 0 0 0 1 LVTTL
-A80 80H 1 0 0 0 0 0 0 0 8 ns
-A10 A0H 1 0 1 0 0 0 0 0 10 ns
-A80 60H 0 1 1 0 0 0 0 0 6 ns
-A10 60H 0 1 1 0 0 0 0 0 6 ns
00H 0 0 0 0 0 0 0 0 None
12
13
14
15
16
17
18
19
20
21
22
23
24
25-26
27
28
29
30
Refresh rate/type
80H 1 0 0 0 0 0 0 0 Normal
SDRAM width
10H 0
0
0
1
0
0
0
0 ×16
Error checking SDRAM width
00H 0 0 0 0 0 0 0 0 None
Minimum clock delay
01H 0 0 0 0 0 0 0 1 1 clock
Burst length supported
8FH 1 0 0 0 1 1 1 1 1, 2, 4, 8, F
P Number of banks on each SDRAM
04H 0 0 0 0 0 1 0 0 4 banks
/CAS latency supported
06H 0 0 0 0 0 1 1 0 2, 3
/CS latency supported
01H 0 0 0 0 0 0 0 1 0
/WE latency supported
01H 0 0 0 0 0 0 0 1 0
r _{SDRAM module attributes}
00H 0 0 0 0 0 0 0 0
SDRAM device attributes : General
0EH 0 0 0 0 1 1 1 0
o _{CL = 2 Cycle time}
-A80 A0H 1 0 1 0 0 0 0 0 10 ns
-A10 D0H 1 1 0 1 0 0 0 0 13 ns
CL = 2 Access time
-A80 60H 0 1 1 0 0 0 0 0 6 ns
d _{-A10 70H 0 1 1 1 0 0 0 0 7 ns}
00H 0 0 0 0 0 0 0 0
tRP(MIN.)
-A80 14H 0 0 0 1 0 1 0 0 20 ns
u _{-A10 14H 0 0 0 1 0 1 0 0 20 ns}
tRRD(MIN.)
-A80 10H 0 0 0 1 0 0 0 0 16 ns
-A10 14H 0 0 0 1 0 1 0 0 20 ns
c tRCD(MIN.)
-A80 14H 0 0 0 1 0 1 0 0 20 ns
-A10 14H 0 0 0 1 0 1 0 0 20 ns
t ^tRAS(MIN.)
-A80 30H 0 0 1 1 0 0 0 0 48 ns
-A10 32H 0 0 1 1 0 0 1 0 50 ns
31 Module bank density
10H 0 0 0 1 0 0 0 0 64M bytes
10
Data Sheet E0063N10