TUSB3410 datasheet(39/92 Pages) TI

39 / 92 page

5–7

5.1.14 SERNUM0: Device Serial Number Register (Byte 0) (Addr:FFE8)

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

After power-up reset, this read-only register (SERNUM0) contains byte 0 of the complete 64-bit device serial number.

The USB reset cannot reset this register.

765

R/O

BIT

NAME

RESET

FUNCTION

7–0

D[7:0]

Device serial number byte 0 value

NOTE: See the same procedure described in SERNUM7 register for procedure to load device serial number into the shared RAM.

5.1.15 Function Reset And Power-Up Reset Interconnect

Figure 5–1 represents the logical connection of the USB-function reset (USBR) and power-up reset (RESET) pins.

The internal RESET signal is generated from the RESET pin (PURS signal) or from the USB reset (USBR signal).

The USBR can be enabled or disabled by the FRSTE bit in the USBCTL register (on power up, FRSTE = 0). The

internal RESET is used to reset all registers and logic, with the exception of the USBCTL and GLOBCTL registers

which are cleared by the PURS signal only.

USBCTL Register

GLOBCTL Register

PURS

USBR

RESET

MCU

FRSTE

USB Function Reset

To Internal MMRs

RESET

WDD[4:0]

WDT Reset

Figure 5–1. Reset Diagram

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