4
V437216C04VDTG-75 Rev. 1.2 July 2001
MOSEL VITELIC
V437216C04VDTG-75
Serial Presence Detect Information
A serial presence detect storage device –
E
2
PROM – is assembled onto the module. Informa-
tion about the module configuration, speed, etc. is
written into the E
2
PROM device during module pro-
duction using a serial presence detect protocol (I
2
C
synchronous 2-wire bus)
SPD-Table for 75 modules:
Byte Number Function Described SPD Entry Value
Hex Value
16Mx72
0 Number of SPD bytes 128 80
1 Total bytes in Serial PD 256 08
2 Memory Type SDRAM 04
3 Number of Row Addresses (without BS bits) 12 0C
4 Number of Column Addresses (for x4 SDRAM) 10 0A
5 Number of DIMM Banks 1 01
6 Module Data Width 72 48
7 Module Data Width (continued) 0 00
8 Module Interface Levels LVTTL 01
9 SDRAM Cycle Time at CL=3 7.5 ns 75
10 SDRAM Access Time from Clock at CL=3 5.4 ns 54
11 Dimm Config (Error Det/Corr.) ECC 02
12 Refresh Rate/Type Self-Refresh, 15.8 µ s80
13 SDRAM width, Primary x4 04
14 Error Checking SDRAM Data Width n/a / x4 04
15 Minimum Clock Delay from Back to Back Random
Column Address
t
ccd
= 1 CLK 01
16 Burst Length Supported 1, 2, 4, 8, full page 8F
17 Number of SDRAM Banks 4 04
18 Supported CAS
Latencies CL = 3 04
19 CS Latencies CS Latency = 0 01
20 WE Latencies WL = 0 01
21 SDRAM DIMM Module Attributes Registered/Buffered 1F
22 SDRAM Device Attributes: General Vcc tol ± 10% 0E
23 Minimum Clock Cycle Time at CAS
Latency = 2 Not Supported 00
24 Maximum Data Access Time from Clock for CL = 2 Not Supported 00
25 Minimum Clock Cycle Time at CL = 1 Not Supported 00
26 Maximum Data Access Time from Clock at CL = 1 Not Supported 00
27 Minimum Row Precharge Time 20 ns 14
28 Minimum Row Active to Row Active Delay t
RRD
15 ns 0F
29 Minimum RAS to CAS Delay t
RCD
20 ns 14
30 Minimum RAS Pulse Width t
RAS
45 ns 2D