TM2CN64EFN 2097152 BY 64BIT

TM4CN64EFN 4194304 BY 64BIT

SYNCHRONOUS DYNAMIC RAM MODULES

SMMS714 − MAY 1998

10

POST OFFICE BOX 1443

serial presence detect (continued)

Table 1. Serial Presence Detect Data for the TM2CN64EFN (Continued)

BYTE

DESCRIPTION OF FUNCTION

TM2CN64EFN-10

BYTE

NO.

DESCRIPTION OF FUNCTION

ITEM

DATA

25

Minimum clock cycle time at CL = X − 2

N/A

00h

26

Maximum data-access time from clock at CL = X − 2

N/A

00h

27

Minimum row-precharge time

tRP = 30 ns

1Eh

28

Minimum row-active to row-active delay

tRRD = 20 ns

14h

29

Minimum RAS-to-CAS delay

tRCD = 30 ns

1Eh

30

Minimum RAS pulse width

tRAS = 50 ns

32h

31

Density of each bank on module

16M Bytes

04h

32

Command and address signal input setup time

tIS = 3 ns

30h

33

Command and address signal input hold time

tIH = 1 ns

10h

34

Data signal input setup time

tIS = 3 ns

30h

35

Data signal input hold time

tIH = 1 ns

10h

36−61

Superset features (may be used in the future)

62

SPD revision

Rev. 1.2

12h

63

Checksum for byte 0 − 62

47

2Fh

64 − 71

Manufacturer’s JEDEC ID code per JEP − 106E

97h

9700...00h

72

Manufacturing location†

TBD

73

Manufacturer’s part number

T

54h

74

Manufacturer’s part number

M

4Dh

75

Manufacturer’s part number

2

32h

76

Manufacturer’s part number

C

43h

77

Manufacturer’s part number

N

4Eh

78

Manufacturer’s part number

6

36h

79

Manufacturer’s part number

4

34h

80

Manufacturer’s part number

E

45h

81

Manufacturer’s part number

F

46h

82

Manufacturer’s part number

N

4Eh

83

Manufacturer’s part number

−

2Dh

84

Manufacturer’s part number

1

31h

85

Manufacturer’s part number

0

30h

86−90

Manufacturer’s part number

SPACE

20h

91

Die revision code†

TBD

92

PCB revision code†

TBD

93−94

Manufacturing date†

TBD

95−98

Assembly serial number†

TBD

99−125

Manufacturer-specific data†

TBD

126

Clock frequency

66 MHz

66h

127

SDRAM component and clock interconnection details

199

C7h

128−166

System-integrator-specific data‡

TBD

167−255

Open

† TBD indicates values are determined at manufacturing time and are module-dependent.

‡ These TBD values are determined and programmed by the customer (optional).