MOTOROLA MVME162-210 Embedded Controller

The MK48T08 BBRAM (also called Non-Volatile RAM or NVRAM) is divided

into six areas as shown in Table 3-10. The first five areas are defined by

software, while the sixth area, the time-of-day (TOD) clock, is defined by the

chip hardware.  The first area is reserved for user data.  The second area is used

by Motorola networking software.  The third area is used by the operating

system.  The fourth area is used by the MVME162 board debugger

(MVME162Bug).  The fifth area, detailed in Table 3-11. is the configuration

area.  The sixth area, the TOD clock, detailed in Table 3-12. is defined by the

chip hardware.

The data structure of the configuration bytes starts at $FFFC1EF8 and is as

follows.

The fields are defined as follows:

1. Four bytes are reserved for the revision or version of this structure.  This

revision is stored in ASCII format, with the first two bytes being the major

version numbers and the last two bytes being the minor version numbers.

For example, if the version of this structure is 1.0. this field contains:

0100

2. Twelve bytes are reserved for the serial number of the board in ASCII

format.  For example, this field could contain:

000000470476

3. Sixteen bytes are reserved for the board ID in ASCII format.  For example,

for an MVME162 board with MC68040. SCSI, Ethernet, 4MB DRAM, and

512KB SRAM, this field contains:

MVME162-23 (The 10 characters are followed by six blanks.)

4. Sixteen bytes are reserved for the printed wiring assembly (PWA) number

assigned to this board in ASCII format.  This includes the 01-W prefix.  This

is for the main logic board if more than one board is required for a set.

Additional boards in a set are defined by a structure for that set.  For

example, for an MVME162 board with MC68040. SCSI, Ethernet,  4MB

DRAM, and 512KB SRAM, at revision A, the PWA field contains:

01-W3814B01A (The 12 characters are followed by four blanks.)

5. Four bytes contain the speed of the board in MHz.  The first two bytes are

the whole number of MHz and the second two bytes are fractions of MHz.

For example, for a 25.00 MHz board, this field contains:

2500

6. Six bytes are reserved for the Ethernet address.  The address is stored in

hexadecimal format.  (Refer to the detailed description in Chapter 4.) If the

board does not support Ethernet, this field is filled with zeros.

7. These two bytes are reserved.

8. Two bytes are reserved for the local SCSI ID.  The SCSI ID is stored in

ASCII format.

9. Eight bytes are reserved for the printed wiring board (PWB) number

assigned to the memory mezzanine board in ASCII format.  This does not

include the 01-W prefix.  For example, for a 4MB parity mezzanine at

revision A, the PWB field contains:

3837B02A

10. Eight bytes are reserved for the serial number assigned to the memory

mezzanine board in ASCII format

Eight bytes are reserved for the printed wiring board (PWB) number

assigned to the serial port 2 personality board in ASCII format.

12. Eight bytes are reserved for the serial number assigned to the serial port 2

personality board in ASCII format.

13. Eight bytes are reserved for the board identifier, in ASCII format, assigned

to the optional first IndustryPack a.

14. Eight bytes are reserved for the serial number, in ASCII format, assigned

to the optional first IndustryPack a.

15. Eight bytes are reserved for the printed wiring board (PWB) number

assigned to the optional first IndustryPack a.

16. Eight bytes are reserved for the board identifier, in ASCII format, assigned

to the optional second IndustryPack b.

17. Eight bytes are reserved for the serial number, in ASCII format,  assigned

to the optional second IndustryPack b.

18. Eight bytes are reserved for the printed wiring board (PWB) number

assigned to the optional second IndustryPack b.

19. Eight bytes are reserved for the board identifier, in ASCII format, assigned

to the optional third IndustryPack c.

20. Eight bytes are reserved for the serial number, in ASCII format,  assigned

to the optional third IndustryPack c.

21. Eight bytes are reserved for the printed wiring board (PWB) number

assigned to the optional third IndustryPack c.

22. Eight bytes are reserved for the board identifier, in ASCII format, assigned

to the optional fourth IndustryPack d.

23. Eight bytes are reserved for the serial number, in ASCII format,  assigned

to the optional fourth IndustryPack d.

24. Eight bytes are reserved for the printed wiring board (PWB) number

assigned to the optional fourth IndustryPack d.

25. Growth space (65 bytes) is reserved.  This pads the structure to an even 256

bytes.

26. The final one byte of the area is reserved for a checksum (as defined in the

MVME162Bug Debugging Package User’s Manual) for security and data

integrity of the configuration area of the NVRAM.  This data is stored in

hexadecimal format.