TUSB6250 datasheet(25/124 Pages) TI

25 / 124 page

Microcontroller Unit (MCU)

6−2

SLLS535A − January 2004

TUSB6250

addressable by the MCU and 8K bytes of RAM for the sector FIFO data space that’s not directly

accessible by the MCU.

•

The MCU can change this power-up RAM configuration by overwriting the value of the RAMPARTN

bits. Thus, reconfiguring this 24K bytes of RAM as part of the code space or sector FIFO data space

per the firmware instruction:

−

RAMPARTN = 01, this yields a total of 16K bytes of code RAM from 2000−5FFF accessible by

the MCU and 24K bytes of RAM for sector FIFO not directly accessible by the MCU, but directly

accessible by the internal ATA/ATAPI interface controller.

−

RAMPARTN = 10, this yields a total of 8K bytes of code RAM from 2000−3FFF accessible by the

MCU and 32K bytes of RAM for sector FIFO not directly accessible by the MCU, but directly

accessible by the internal ATA/ATAPI interface controller.

8K Bytes

ROM

0000

1FFF

8K Bytes

RAM

(Fixed for Code)

2000

3FFF

24K Bytes

RAM

(Configurable

for Code or

Sector FIFO

Data Space)

4000

5FFF

6000

7FFF

8000

9FFF

4K Bytes

SPRAM

E000

EFFF

MMR

F000

F0F9

Code/Data Space Partition Result Based

on the Setting of the RAMPARTN Bits

32K Bytes

RAM

For Code

16K Bytes

RAM

For Code

8K Bytes

RAM

For Code

8K Bytes

RAM

For Data

24K Bytes

RAM

For Data

32K Bytes

RAM

For Data

Figure 6−1. MCU Memory Map

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