DF69 datasheet(30/106 Pages) PADAUK

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DF69

DC Fan Controller

5-5. Data Memory -- SRAM

Fig. 5-5-1 shows the SRAM data memory organization of DF69, all the SRAM data memory could be accessed

by every FPP unit directly with 1T clock cycle, the data access can be byte or bit operation. Besides data

storage, the SRAM data memory is also served as data pointer of indirect access method and the stack

memory for all FPP units.

The stack memory for each processing unit should be independent from each other, and defined in the data

memory. The stack pointer is defined in the stack pointer register of each processing unit; the depth of stack

memory of each processing unit is defined by the user. The arrangement of stack memory fully flexible and can

be dynamically adjusted by the user.

For indirect memory access mechanism, the data memory is used as the data pointer to address the data byte.

All the data memory could be the data pointer; it’s quite flexible and useful to do the indirect memory access.

All the 208 bytes data memory of DF69 can be accessed by indirect access mechanism.

Fig. 5-5-1 Data Memory Organization

DATA

index

FPP0 stack

Address

000h

CFh

FPP1

FPP2

FPP3

FPP4

FPP5

FPP6

FPP7

FPP1 stack

FPP2 stack

FPP3 stack

FPP4 stack

FPP5 stack

FPP6 stack

FPP7 stack

DATA

FPP0

DATA

index

FPP0 stack

Address

000h

CFh

FPP1

FPP2

FPP3

FPP4

FPP5

FPP6

FPP7

FPP1 stack

FPP2 stack

FPP3 stack

FPP4 stack

FPP5 stack

FPP6 stack

FPP7 stack

DATA

FPP0

Page 30 of 106

PDK-DS-DF69_V003 – Apr. 18, 2018

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