Motorola MVME6100 用户手册
2-10
Computer Group Literature Center Web Site
Programming Details
2
The following table shows the I
2
C devices on the MVME6100 and their
assigned device IDs.
Notes
1. The SPD defines the physical attributes of each bank or
group of banks, i.e. if both banks of a group are populated,
they will be the same speed and memory size.
they will be the same speed and memory size.
2. This is a dual address serial EEPROM (AT24C64A or
equivalent).
DDR DRAM Serial Presence Detect
There are two onboard SPD serial EEPROMs on the MVME6100
accessible via the I
accessible via the I
2
C serial interface. The first 128 bytes of each SPD
contains module type, SDRAM organization, and timing parameters.
Table 2-4. I2C Bus Device Addressing
Device Function
Size
Device Address
(A2A1A0)
(A2A1A0)
I2C BUS
Address
Address
Notes
Memory SPD (Bank 0 and 1)
256 x 8
000b
$A0
1
Memory SPD (Bank 2 and 3)
256 x 8
001b
$A2
1
Reserved (PMCSpan SROM)
NA
010b
$A4
MV64360 User Defined Initialization
8K x 8
011b
$A6
2
Configuration VPD
8K x 8
100b
$A8
2
User VPD
8K x 8
101b
$AA
2
Not Used
NA
110b
$AC
Not Used
NA
111b
$AE
DS1621 Temperature Sensor
NA
011b
$90