Technical data

Programming Details

MVME4100 Single Board Computer Programmer’s Reference (6806800H19B)

4.5 I

C Device Addresses

A two-wire serial interface is provided by an I

C compatible serial controller integrated into the

MPC8548E. The MPC8548E I

C controller is used by the system software to read the contents

of the various I

C devices located on the MVME4100. The following table contains the I

devices used for the MVME4100 and their assigned device addresses.

1. Each SPD defines the physical attributes of each bank or group of banks.

2. This is a dual address serial EEPROM.

3. The device address is user selectable using switches on the RTM. The recommended

address setting for the MVME4100 is $AA.

4.6 User Configuration EEPROM

The board provides two 64 KB dual address serial EEPROMs for a total of 128 KB user

configuration storage. These EEPROMs are hardwired to have device IDs as shown in Table 4-4

on page 62, and each device ID will not be used for any other function. Refer to the EEPROM

Datasheet listed in Appendix B, Related Documentation, for additional details.

Table 4-4 I2C Bus Device Addressing

I2C Bus

Address

Device Address

A2 A1 A0

(binary) Size (bytes) Device Function Notes

$98 N/A N/A MAX6649 temperature sensor -

$A0 000 256 x 8 SO-CDIMM SPD 1

$A4 010 65,536 x 8 User configuration 2

$A6 011 65,536 x 8 User configuration 2

$A8 100 8192 x 8 VPD (on-board system configuration) 2

$AA 101 8192 x 8 RTM VPD (off-board configuration) 2, 3

$AC 110 8192 x 8 XMCSpan VPD -

$AE 111 - Reserved -

$D0 N/A N/A DS1375 real-time clock -