TMD4903 datasheet(61/86 Pages) OSRAM

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Datasheet, Public

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[v2-00] 2022-Nov-03

TMD4903 − Application Information

Figure 71:

Pattern RAM Table

Pattern RAM: Volatile memory used for storing pattern data.

Note(s):

1. T_DATA = 0xFE is a special instruction. The following value in RAM becomes

the start address of any repeated sub-pattern.

2. T_DATA = 0xFF is a special instruction. It identifies the end of the pattern.

There are two special values that control the flow of the pattern:

Stop and Repeat-destination. A Stop is signified by the value of

0xFF loaded into a pattern ram location. The value is analogous

to a null character at the end of a text file. Any remaining RAM

after the 0xFF operator is encountered is not executed and the

pattern is finished. The Repeat-destination operator is signified

by a value of 0xFE followed by the start address of any repeated

sub-pattern. This value is analogous to a “goto”statement. Once

this value is encountered instruction pointer to the pattern RAM

is changed to the address stored in the next pattern RAM

location. These data values will not be decoded by the logic as

a reference/pointer to the timeword table, that is, 0xFF will not

index timeword location 15 for pulse and gap.

Pattern RAM

Address (Bank 0)

Data (Pulse-Gap)

00x0 to 0xFF

10x0 to 0xFF

20x0 to 0xFF

30x0 to 0xFF

255

0x0 to 0xFF

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