HP Compaq dc7100 DT Technical Reference Manual page 56

Processor/Memory Subsystem
The SPD address map is shown in Table 3-2.
Byte
0 No. of Bytes Written Into EEPROM
1 Total Bytes (#) In EEPROM
2 Memory Type
3 No. of Row Addresses On DIMM
4 No. of Column Addresses On DIMM
5 No. of Module Banks On DIMM
6, 7 Data Width of Module
8 Voltage Interface Standard of DIMM
9 Cycletime @ Max CAS Latency (CL)
10 Access From Clock
11 Config. Type (Parity, Nonparity...)
12 Refresh Rate/Type
13 Width, Primary DRAM
14 Error Checking Data Width
15 Min. Clock Delay
16 Burst Lengths Supported
17 No. of Banks For Each Mem. Device
18 CAS Latencies Supported
19 CS# Latency
20 Write Latency
21 DIMM Attributes
22 Memory Device Attributes
23 Min. CLK Cycle Time at CL X-1
24 Max. Acc. Time From CLK @ CL X-1
NOTES:
[1] Programmed as 128 bytes by the DIMM OEM
[2] Must be programmed to 256 bytes.
[3] High order bit defines redundant addressing: if set (1), highest order RAS# address must be re-sent as highest order CAS#
address.
[4] Refer to memory manufacturer's datasheet
[5] MSb is Self Refresh flag. If set (1), assembly supports self refresh.
[6] Back-to-back random column addresses.
[7] Field format proposed to JEDEC but not defined as standard at publication time.
[8] Field specified as optional by JEDEC but required by this system.
[9] HP usage. This system requires that the DIMM EEPROM have this space available for reads/writes.
[10] Serial # in ASCII format (MSB is 133). Intended as backup identifier in case vender data is invalid.
Can also be used to indicate s/n mismatch and flag system adminstrator of possible system Tampering.
[11]Contains the socket # of the module (first module is "1"). Intended as backup identifier (refer to note [10]).
3-6
Table 3-2
SPD Address Map (SDRAM DIMM)
Description Notes
[4][5]
361834-002
Byte
[1] 25 Min. CLK Cycle Time at CL X-2
[2] 26 Max. Acc. Time From CLK @ CL X-2
27 Min. Row Prechge. Time
[3] 28 Min. Row Active to Delay
29 Min. RAS to CAS Delay
30-31 Reserved
32-61 Superset Data
62 SPD Revision
[4] 63 Checksum Bytes 0-62
[4] 64-71 JEP-106E ID Code
72 DIMM OEM Location
73-90 OEM's Part Number
91-92 OEM's Rev. Code
93-94 Manufacture Date
[6] 95-98 OEM's Assembly S/N
99- OEM Specific Data
125
[4] 126 Intel frequency check
[4] 127 Reserved
[4] 128 - 131 Compaq header "CPQ1"
[4] 132 Header checksum
133 - 145 Unit serial number
146 DIMM ID
[7] 147 Checksum
[7] 148 Reserved
Description Notes
[7]
[7]
[7]
[7]
[7]
[7]
[7]
[8]
[8]
[8]
[8]
[8]
[8]
[8]
[9]
[9]
[9][10]
[9][11]
[9]
[9]
Technical Reference Guide