MC-458CA727 Datasheet, PDF (10/16 Pages) NEC – 8M-WORD BY 72-BIT SYNCHRONOUS DYNAMIC RAM MODULE UNBUFFERED TYPE

MC-458CA727
Serial PD
Byte No.
Function Described
0 Defines the number of bytes written into
serial PD memory
1 Total number of bytes of serial PD memory
2 Fundamental memory type
3 Number of rows
4 Number of columns
5 Number of banks
6 Data width
7 Data width (continued)
8 Voltage interface
9 CL = 3 Cycle time
10 CL = 3 Access time
11 DIMM configuration type
12 Refresh rate/type
13 SDRAM width
14 Error checking SDRAM width
15 Minimum clock delay
16 Burst length supported
17 Number of banks on each SDRAM
18 /CAS latency supported
19 /CS latency supported
20 /WE latency supported
21 SDRAM module attributes
22 SDRAM device attributes : General
23 CL = 2 Cycle time
24 CL = 2 Access time
25-26
27
tRP(MIN.)
28
tRRD(MIN.)
29
tRCD(MIN.)
30
tRAS(MIN.)
31 Module bank density
Hex
80H
08H
04H
0CH
09H
01H
48H
00H
01H
75H
54H
02H
80H
10H
10H
01H
8FH
04H
06H
01H
01H
00H
0EH
A0H
60H
00H
14H
0FH
14H
2DH
10H
(1/2)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Notes
1
0
0
0
0
0
0
0 128 bytes
0
0
0
0
1
0
0
0 256 bytes
0
0
0
0
0
1
0
0 SDRAM
0
0
0
0
1
1
0
0 12 rows
0
0
0
0
1
0
0
1 9 columns
0
0
0
0
0
0
0
1 1 bank
0
1
0
0
1
0
0
0 72 bits
0
0
0
0
0
0
0
00
0
0
0
0
0
0
0
1 LVTTL
0
1
1
1
0
1
0
1 7.5 ns
0
1
0
1
0
1
0
0 5.4 ns
0
0
0
0
0
0
1
0 ECC
1
0
0
0
0
0
0
0 Normal
0
0
0
1
0
0
0
0 ×16
0
0
0
1
0
0
0
0 ×16
0
0
0
0
0
0
0
1 1 clock
1
0
0
0
1
1
1
1 1, 2, 4, 8, F
0
0
0
0
0
1
0
0 4 banks
0
0
0
0
0
1
1
0 2, 3
0
0
0
0
0
0
0
10
0
0
0
0
0
0
0
10
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
0
1
0
1
0
0
0
0
0 10 ns
0
1
1
0
0
0
0
0 6 ns
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
0 20 ns
0
0
0
0
1
1
1
1 15 ns
0
0
0
1
0
1
0
0 20 ns
0
0
1
0
1
1
0
1 45 ns
0
0
0
1
0
0
0
0 64M bytes
10
Data Sheet E0060N20