TUSB6250 datasheet(35/125 Pages) TI1

35 / 125 page

Microcontroller Unit (MCU)

6−12

SLLS535E − April 2008

TUSB6250

765

43210

RSV

BANKSEL2

BANKSEL1

BANKSEL0

SCRATCH

R/O

R/W

BIT

NAME

RESET

FUNCTION

SCRATCH

This is a scratch bit that can be read and written by the MCU for any end-product-specific

function, if supported by the end-product custom firmware.

One of the recommended usages can be defined as a bit to indicate to the application

firmware whether the power-up sequence that occurred on the ATA/ATAPI device was

caused by a remote wakeup, resume from suspend, or a power-up reset. This can be

achieved by the MCU writing a 1 to this bit before going into suspend.

3−1

BANKSEL

[2:0]

000

IDATA bank select.

The MCU can write to BANKSEL to select a particular bank in one of the eight IDATA bank

spaces. Each bank has a capacity of 256 bytes with the middle 128 bytes shared with the

other banks.

7−4

RSV

Reserved = 0h

Internal Data Memory

Bank 0

(256

× 8 Bit)

Nonshared Space

64 Bytes

Nonshared Space

64 Bytes

Internal Data Memory

Bank N (N = 1 − 7)

(256

× 8 Bit)

Nonshared Space

64 Bytes

Nonshared Space

64 Bytes

Shared Space

128 Bytes

Figure 6−2. IDATA Space Memory Configuration

TUSB6250 Datasheet(PDF) 35 Page - Texas Instruments

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