HYMD512646A8J
Rev. 0.1/Feb. 2003 17
SERIAL PRESENCE DETECT
Byte# Function Description
Function Supported Hexa Value Note
D43 D4 JD43 D4 J
0Number of Bytes written into serial memory at module manufac-
turer 128 Bytes 80h
1 Total number of Bytes in SPD device 256 Bytes 08h
2 Fundamental memory type DDR SDRAM 07h
3 Number of row address on this assembly 13 0Dh 1
4 Number of column address on this assembly 11 0Bh 1
5 Number of physical banks on DIMM 2Banks 02h
6 Module data width 64 Bits 40h
7 Module data width (continued) - 00h
8 Module voltage Interface levels(VDDQ) SSTL 2.5V 04h
9DDR SDRAM cycle time at CAS Latency=2.5(tCK)@DDR333,
3(tCK)@DDR400
5.0ns 5.0ns 6.0ns 50h 50h 60h 2
10 DDR SDRAM access time from clock at CL=2.5(tAC),
3(tCK)@DDR400
+/-0.7ns 70h 2
11 Module configuration type Non-ECC 00h
12 Refresh rate and type 7.8us & Self refresh 82h
13 Primary DDR SDRAM width x8 08h
14 Error checking DDR SDRAM data width N/A 00h
15 Minimum clock delay for back-to-back random column
address(tCCD) 1 CLK 01h
16 Burst lengths supported 2,4,8 0Eh
17 Number of banks on each DDR SDRAM 4 Banks 04h
18 CAS latency supported 2, 2.5, 3 2, 2.5, 3 2, 2.5 1Ch 1Ch 0Ch
19 CS latency 001h
20 WE latency 102h
21 DDR SDRAM module attributes Differential Clock Input 20h
22 DDR SDRAM device attributes : General
+/-0.2Voltage tolerance,
Concurrent Auto Precharge
tRAS Lock Out
C0h
23 DDR SDRAM cycle time at CL=2.0(tCK), 2.5(tCK) 6ns 6ns 7.5ns 60h 60h 75h 2
24 DDR SDRAM access time from clock at CL=2.0(tAC), 2.5(tAC) +/-0.7ns +/-0.7ns +/-0.7ns 70h 70h 70h 2
25 DDR SDRAM cycle time at CL=1.5(tCK), 2.0(tCK) 7.5ns 7.5ns - 75h 75h 00h 2
26 DDR SDRAM access time from clock at CL=1.5(tAC), 2.0(tAC) +/-0.75ns +/-0.75ns - 75h 75h 00h 2
27 Minimum row precharge time(tRP) 15ns 18ns 18ns 3Ch 48h 48h
28 Minimum row activate to row active delay(tRRD) 10ns 10ns 12ns 28h 28h 30h
29 Minimum RAS to CAS delay(tRCD) 15ns 18ns 18ns 3Ch 48h 48h
30 Minimum active to precharge time(tRAS) 40ns 40n 42ns 28h 28h 2Ah
31 Module row density 512MB 80h
32 Command and address signal input setup time(tIS) 0.6ns 0.6ns 0.75ns 60h 60h 75h
33 Command and address signal input hold time(tIH) 0.6ns 0.6ns 0.75ns 60h 60h 75h
34 Data signal input setup time(tDS) 0.4ns 0.4ns 0.45ns 40h 40h 45h
35 Data signal input hold time(tDH) 0.4ns 0.4ns 0.45ns 40h 40h 45h
36~40 Reserved for VCSDRAM Undefined 00h
41 Minimum active / auto-refresh time ( tRC) 55ns 58ns 60ns 37h 3Ah 3Ch
42 Minimum auto-refresh to active/auto-refresh
command period(tRFC) 70ns 70ns 72ns 46h 46h 48h
43 Maximum cycle time (tCK max) 10ns 10ns 12ns 28h 28h 30h
44 Maximim DQS-DQ skew time(tDQSQ) 0.4ns 0.4ns 0.45ns 28h 28h 2Dh
45 Maximum read data hold skew factor(tQHS) 0.50ns 0.50ns 0.55ns 50h 50h 55h
46~61 Superset information(Reserved for IDD values, Tcase, etc.) Undefined 00h
62 SPD Revision code Initial release 00h
63 Checksum for Bytes 0~62 - A8h C3h 42h
64 Manufacturer JEDEC ID Code Hynix JEDEC ID ADh
65~71 --------- Manufacturer JEDEC ID Code - 00h
Bin Sort : J(DDR333@CL=2.5), D4/D43(DDR400@CL=3)