SPD Bits
15 SPD Bits
15.1
Access Mechanisms
The tables in this section contain the Intel recomendations for the SPD bits that will be
pulled from the DIMM’s non-volital RAM and programmed into the Intel 6400/6402
Advanced Memory Buffer (AMB) component. This is done by the BIOS when required.
There is a table for each of the raw cards that the DIMM can be based on.
15.1.1
Raw Cards A, B, and C
Table 15-1. Raw Cards A, B, and C (Sheet 1 of 2)
C0 Stepping
D1 Stepping
Byte 533MHz 667MHz 533MHz 667MHz
Description
FBD channel Protocols Supported
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
0x02
0x00
0x10
0x56
0x40
0x36
0x30
0x54
0x6E
0x60
0x9A
0x78
0x00
0x00
0x00
0x00
0x00
0x00
0x02
0x00
0x10
0x56
0x40
0x36
0x30
0x67
0x7F
0x6E
0xAA
0x86
0x00
0x00
0x00
0x00
0x00
0x00
0x02
0x00
0x10
0x56
0x40
0x36
0x30
0x52
0x66
0x60
0x84
0x6A
0x00
0x00
0x00
0x00
0x00
0x00
0x02
0x00
0x10
0x56
0x40
0x36
0x30
0x60
0x7A
0x6E
0xA1
0x7F
0x00
0x00
0x00
0x00
0x00
0x00
B2B Access Turnaround Bubble (assumes at tCK)
CMD2DATA (800)
CMD2DATA (667)
CMD2DATA (533)
TR AMB (free air JEDEC)
AMB DT Idle_0
AMB DT Idle_1
AMB DT Idle_2
AMB DT Active_1
AMB DT Active_2
AMB DT L0s
reserved (TR DRAM)
reserved (TR AMB)
reserved (TR DRAM2AMB)
reserved (TR AMB2DRAM)
Tjmax
See Category-Byte Table for values
Reserved
100 0x00
101 0x80
102 0x20
103 0x00
104 0x44
105 0x00
106 0x80
0x00
0x80
0x20
0x00
0x44
0x00
0x80
0x00
0x80
0x20
0x00
0x44
0x04
0x80
0x00
0x80
0x20
0x00
0x44
0x04
0x80
AMB Personality Bytes PRE-INIT
Intel® 6400/6402 Advanced Memory Buffer Datasheet
243
INTEL [ INTEL ]
