TUSB3410 datasheet(36/92 Pages) TI

36 / 92 page

5–4

5.1.5

MODECNFG: Mode Configuration Register (Addr:FFFB)

This register is cleared by the power-up reset signal only. The USB reset cannot reset this register.

765

RSV

CLKSLCT

CLKOUTEN

SOFTSW

TXCNTL

R/O

R/W

BIT

NAME

RESET

FUNCTION

TXCNTL

Transmit output control: Hardware or firmware switching select for 3-state serial output buffer.

TXCNTL = 0

TXCNTL = 1

Hardware automatic switching is selected

Firmware toggle switching is selected

SOFTSW

Soft switch: Firmware controllable 3-state output buffer enable for serial output pin.

SOFTSW = 0

SOFTSW = 1

Serial output buffer is enabled

Serial output buffer is disabled

CLKOUTEN

Clock output enable: Enable/disable the clock output at CLKOUT terminal.

CLKOUTEN = 0

CLKOUTEN = 1

Clock output is disabled. Device drives low at CLKOUT terminal.

Clock output is enabled

CLKSLCT

Clock output source select: Select between 3.556-MHz fixed clock or UART baud out clock as output

clock source.

CLKSLCT = 0

CLKSLCT = 1

UART baud out clock is selected as clock output

Fixed 3.556-MHz free running clock is selected as clock output

4–7

RSV

Reserved

Clock Output Control

The CLKOUTEN bit in the Mode Configuration Register (MODECNFG) is used to enable or disable the clock output

at the CLKOUT terminal of the TUSB3410. The power up default of CLKOUT is disabled to ensure the clock is not

applied to the smart card until it is powered. Firmware can write a 1 to enable the clock output if needed.

The CLKSLCT bit in the MODECNFG register is used to select the output clock source from either a fixed 3.556-MHz

free-running clock or the UART BaudOut clock.

5.1.6

Vendor ID/Product ID

USB–IF and Microsoft WHQL certification requires that end equipment makers use their own unique vendor ID and

product ID for each product (model). OEMs cannot use silicon vendor’s (for instance, TI’s default) VID/PID in their

end products. A unique VID/PID combination will avoid potential driver conflicts and enable logo certification. See

www.usb.org for more information.

5.1.7

SERNUM7: Device Serial Number Register (Byte 7) (Addr:FFEF)

Each TUSB3410 chip has a unique 64-bit serial die id number, which is generated during manufacturing. The die id

is incremented sequentially, however there is no assurance without skip in the die id number. The device serial

number register utilizes (mirrors) this unique 64-bit serial die id number.

After power-up reset, this read-only register (SERNUM7) contains the most significant byte (byte 7) of the complete

64-bit device serial number. The USB reset cannot reset this register.

765

D63

D62

D61

D60

D59

D58

D57

D56

R/O

BIT

NAME

RESET

FUNCTION

7–0

D[7:0]

Device serial number byte 7 value

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