Figure 29. Dcf Start Record - STMicroelectronics SPC572L series Reference Manual

RM0400
Field
62 Parity Bit for the DCF Record.
Parity Note: This bit is NOT implemented for DCF Clients written from UTEST.
This bit indicates the end of the list of DCF Records.
Note: The Erased state of flash is 0xFFFF_FFFF_FFFF_FFFF. Therefore the list ends with the first
63 unprogrammed double word. This location can be programmed with a new record to extend
the list.
Stop
1 End of the list.
0 NOT the end of the list.
The following structure must be present:
•
The first record must be a start record.
•
DCF records containing configuration data must immediately follow the start record
with no blank records between—an unprogrammed record is interpreted as a stop
record and no DCF records following that record are processed.
• The end of the configuration records are indicated by the presence of a stop record.
Each record is 64 bits in length.
Warning:
0x05AA55AF
During system boot, while the reset signal is asserted, the SSCM reads the device
configuration records and writes the data to the appropriate internal module registers. Many
operational aspects of the device are therefore already configured when the reset signal is
released and normal device operation begins.
Some device configuration records are calculated during production testing and
programmed into the TEST flash memory area. Other DCF records are developed by the
user and programmed into the UTEST flash area.
The stop bit designates the last device configuration record in a set of records. It is not
normally set in a valid UTEST DCF record programmed during production as this prevents
additional UTEST records from being appended to the factory programmed UTEST DCF
records. However, the flash memory location following the last UTEST DCF record
programmed at the factory is an unprogrammed location whose contents is
0xFFFF_FFFF_FFFF_FFFF. The stop bit location in this unprogrammed flash memory
location is therefore a logic 1, signifying that this is the last DCF record and not to be acted
on.
Table 69. DCF record field description(Continued)
Figure 29
The start record must be placed at the beginning of the DCF
area in UTEST flash memory to indicate that the following
data records must be processed.

Figure 29. DCF start record

0x00
0:31
DocID027809 Rev 4
Device Configuration Format (DCF) Records
Description
shows the DCF start record.
0x00000000
0x04
32:63
207/2058
217