SPRUIN7C March 2020 – March 2024 TMS320F280021 , TMS320F280021-Q1 , TMS320F280023 , TMS320F280023-Q1 , TMS320F280023C , TMS320F280025 , TMS320F280025-Q1 , TMS320F280025C , TMS320F280025C-Q1
In Direct Access Mode, the external host through the HIC can directly read from and write to device locations specified in the memory map. The device location to read is a combination of the 8-bit address lines A[7:0] and the 24-bit HICDBADDR{#} register.
These two address pieces are concatenated as:
Full 32-bit Address = {HICDBADDR{#}.BASE_ADDR[31:8},A[7:0]}
There are 8 HICDBADDR{#} registers for a total of 2048 address locations in combination with A[7:0] address lines. Which HICDBADDR{#} register to concatenate with A[7:0] is selectable by the HICBASESEL register or BASESEL[2:0] pins. Figure 13-7 shows the Direct Access Mode and the minimum external connections required for this mode.