M34E02, M34E02-F

Use within a DDR1/DDR2 DRAM module

Doc ID 10367 Rev 10

21/34

Figure 11.

Serial presence detect block diagram

1.

E0, E1 and E2 are wired at each DRAM module slot in a binary sequence for a maximum of 8 devices.

2.

Common clock and common data are shared across all the devices.

R = 4.7 k

Ω

AI01937b

DRAM module slot number 7

SDA

SCL

E0

E1

E2

VCC

DRAM module slot number 6

SDA

SCL

E0

E1

E2

DRAM module slot number 5

SDA

SCL

E0

E1

E2

DRAM module slot number 4

SDA

SCL

E0

E1

E2

DRAM module slot number 3

SDA

SCL

E0

E1

E2

DRAM module slot number 2

SDA

SCL

E0

E1

E2

VCC

DRAM module slot number 1

SDA

SCL

E0

E1

E2

DRAM module slot number 0

SDA

SCL

E0

E1

E2

VSS

VSS

VSS

VCC

VSS

VSS VCC

VCC

VSS

VCC

VCC VSS

VSS

VCC

SCL line

SDA line

From the motherboard