參數(shù)資料
型號(hào)： TUSB3410VF
英文描述： BUS CONTROLLER
中文描述： 總線控制器
文件頁(yè)數(shù)： 37/92頁(yè)
文件大?。?/td> 317K
代理商： TUSB3410VF
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 I
2
C 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.
7
6
5
4
3
2
1
0
D55
R/O
D54
R/O
D53
R/O
D52
R/O
D51
R/O
D50
R/O
D49
R/O
D48
R/O
BIT
7
–
0
NAME
D[7:0]
RESET
FUNCTION
Device serial number byte 6 value
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.
7
6
5
4
3
2
1
0
D47
R/O
D46
R/O
D45
R/O
D44
R/O
D43
R/O
D42
R/O
D41
R/O
D40
R/O
BIT
7
–
0
NAME
D[7:0]
RESET
FUNCTION
Device serial number byte 5 value
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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