TUSB3410 datasheet(37/92 Pages) TI

37 / 92 page

5–5

Procedure to load device serial number value in shared RAM:

•

After power-up reset, boot code copies the predefined USB descriptors to shared RAM. As a result, the

default serial number hard-coded in the boot code (0x00 hex) is copied to the shared RAM data space.

•

Once the boot code finishes copying descriptors, it performs a read to the SERNUM7 to SERNUM0

registers and overwrites the device serial number value stored in the shared RAM with the one found in the

SERNUM7 to SERNUM0 registers.

•

Once the boot code finishes the read to SERNUM7 – SERNUM0 registers, it then checks if EEPROM is

present on the I2C port. If the EEPROM is present and contains a valid device serial number as part of the

USB device descriptor information stored in EEPROM, the boot code overwrites the serial number value

stored in shared RAM with the one found in EEPROM. Otherwise, the device serial number value stored

in shared RAM stays unchanged from previous step.

•

In summary, the serial number value in external EEPROM has the highest priority to be loaded into shared

RAM data space. The serial number value stored in shared RAM is used as part of the valid device

descriptor information during normal operation.

5.1.8

SERNUM6: Device Serial Number Register (Byte 6) (Addr:FFEE)

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

After power-up reset, this read-only register (SERNUM6) contains byte 6 of the complete 64-bit device serial number.

The USB reset cannot reset this register.

765

D55

D54

D53

D52

D51

D50

D49

D48

R/O

BIT

NAME

RESET

FUNCTION

7–0

D[7:0]

Device serial number byte 6 value

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

5.1.9

SERNUM5: Device Serial Number Register (Byte 5) (Addr:FFED)

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

After power-up reset, this read-only register (SERNUM5) contains byte 5 of the complete 64-bit device serial number.

The USB reset cannot reset this register.

765

D47

D46

D45

D44

D43

D42

D41

D40

R/O

BIT

NAME

RESET

FUNCTION

7–0

D[7:0]

Device serial number byte 5 value

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

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