TUSB6250 datasheet(17/124 Pages) TI

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Device Parameter Information

4−4

SLLS535A − January 2004

TUSB6250

Table 4−1. Controller Terminal Description (80-Pin TQFP) (Continued)

TERMINAL

I/O

DESCRIPTION

NAME

NO.

TYPE

NOTES

DESCRIPTION

P3.7

I/O

(2)(5)

(9)

5-V fail-safe general-purpose I/O with internal configurable pullup and pulldown resistors. This

terminal can be used as a GPIO or DASP function, which is implemented by the end product

developer’s custom firmware. After a power-on reset, this terminal defaults as input with the internal

pullup resistor activated. The MCU can reconfigure the pullup and pulldown resistors, if desired.

RST_ATA

(2)(9)

ATA/ATAPI: Asynchronous drive-reset signal. This terminal should be connected to the

corresponding pin of the ATA/ATAPI interface connector on the end product PCB.

OTHER GPIOS (GENERAL PURPOSE I/Os)

P2.7

I/O

(1)(6)

(8)

General-purpose I/O with an internal controllable pullup resistor. After a power-on reset, this terminal

defaults as an input with an internal pullup resistor activated. The MCU can disable the pullup resistor

if desired.

P2.6,

P2.5,

P2.4,

P2.0

62,

64,

65,

I/O

(2)(5)

(9)

5-V fail-safe general-purpose I/O with internal configurable pullup and pulldown resistors. After

power-on reset, these terminals default as inputs with the internal pullup resistor activated. The MCU

can reconfigure the pullup and pulldown resistors if desired.

P2.3

(3)

General-purpose open-drain output without internal pullup and pulldown resistors.

P2.2/

PWR500

(3)

General-purpose open-drain output. This terminal can be controlled by the firmware to inform the

ATA/ATAPI device connected to the TUSB6250 that the end product device (including the TUSB6250

itself) is allowed to draw 500 mA from the USB bus after the device is fully enumerated and configured

as a USB bus-powered device.

P2.1/

PWR100

(3)

General-purpose open-drain output. During the USB enumeration phase, This terminal is asserted

by the boot code to inform the ATA/ATAPI device connected to the TUSB6250 that the end product

device (including the TUSB6250 itself) is allowed to draw 100 mA from the USB bus. After the boot

code relinquishes control to the firmware when USB enumeration, configuration, and firmware

download are finished, the firmware can reconfigure the function of this terminal for other usage, as

long as such usage is not conflicting with the previous usage, which, for example, can be

implemented in the end product for power sequencing control purposes. It should be noted that, for

self-powered applications, if VBUS from the USB bus is not present (for example, the USB cable is

not connected) during boot time, the boot code does not assert this terminal. In this condition, it is

the firmware’s responsibility to assert this terminal, once the firmware is downloaded and gains

control.

P3.5,

P3.4

70,

I/O

(2)(5)

(9)

5-V fail-safe general-purpose I/O with internal configurable pullup and pulldown resistors. After

power-on reset, these terminals default as inputs with an internal pullup resistor activated. The MCU

can reconfigure the pullup and pulldown resistors if desired. These two terminals can be used as

remote wake-up event inputs. The end product developer’s custom firmware can utilize these two

terminals to implement some end product specific functions, such as cartridge insertion detection,

eject button pressed, or external control input to request the end product custom firmware to put the

TUSB6250’s ATA/ATAPI bus into 3-state.

P3.3/CD2,

P3.2/CD1

I/O

(2)(5)

(9)

5-V fail-safe general-purpose I/O with internal configurable pullup and pulldown resistors. After

power-on reset, these terminals default as inputs with an internal pullup resistor activated. The MCU

can reconfigure the pullup and pulldown resistors, if desired. These terminals can be used as GPIOs

or compact flash card insertion/removal detection function implemented by the end product

developer’s custom firmware. These terminals are remote wake-up capable inputs, if enabled.

NOTES:

1. 3-state 3.3-V LVCMOS output (

±8-mA drive/sink).

2. 3-state 3.3-V LVCMOS output, 5-V fail-safe (

±8-mA drive/sink). The 5-V fail-safe means this output buffer can be exposed to a 5-V

application environment. Although it can not output 5 V when interfacing with the 5-V ATA/ATAPI device, an external pullup resistor

to a 5-V power source can be used to pull the output voltage up to 5 V. The fail-safe buffer is designed to be protected from damage

under a condition where the buffer is exposed to 5 V, while the device is powered down (its supply voltage is zero).

3. Open-drain output (8-mA sink), 5-V fail-safe, without internal pullup and pulldown resistors.

4. 3.3-V LVCMOS hysteresis input.

5. TTL-compatible, 5-V fail-safe, hysteresis input.

6. 3.3-V LVCMOS input without hysteresis.

7. Open-drain output (4-mA sink) with an internal pullup resistor.

8. Internal 100-

µA active pullup resistor.

9. Configurable internal 200-

µA active pullup and pulldown resistors.

10. Controllable internal 200-

µA active pulldown resistor

11. 1.8-V LVCMOS input buffer

12. 1.8-V LVCMOS output buffer

TUSB6250 Datasheet(PDF) 17 Page - Texas Instruments

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