Datasheet

TUSB3410 Bootcode Flow
73
SLLS519H—January 2010 TUSB3410, TUSB3410I
11.8.3 External Memory Read
The bootcode returns the content of the specified address.
bmRequestType USB_REQ_TYPE_DEVICE |
USB_REQ_TYPE_VENDOR |
USB_REQ_TYPE_IN
11000000b
bRequest BTC_EXETERNAL_MEMORY_READ 0x90
wValue None 0x0000
wIndex Data address 0xNNNN (From 0x0000 to 0xFFFF)
wLength 1 byte 0x0001
Data Byte in the specified address 0xNN
11.8.4 External Memory Write
The external memory write command tells the bootcode to write data to the specified address.
bmRequestType USB_REQ_TYPE_DEVICE |
USB_REQ_TYPE_VENDOR |
USB_REQ_TYPE_OUT
01000000b
bRequest BTC_EXETERNAL_MEMORY_WRITE 0x91
wValue HI: 0x00
LO: Data
0x00NN
wIndex Data address 0xNNNN (From 0x0000 to 0xFFFF)
wLength None 0x0000
Data None
11.8.5 I
2
C Memory Read
The bootcode returns the content of the specified address in I
2
C EEPROM.
In the wValue field, the I
2
C device number is from 0x00 to 0x07 in the high byte. The memory type is from 0x01
to 0x03 for CAT I to CAT III devices. If bit 7 of bValueL is set, then the bus speed is 400 kHz. This request is
also used to set the device number and speed before the I
2
C write request.
bmRequestType USB_REQ_TYPE_DEVICE |
USB_REQ_TYPE_VENDOR |
USB_REQ_TYPE_IN
11000000b
bRequest BTC_I2C_MEMORY_READ 0x92
wValue HI: I
2
C device number
LO: Memory type bit[1:0]
Speed bit[7]
0xXXYY
wIndex Data address 0xNNNN (From 0x0000 to 0xFFFF)
wLength 1 byte 0x0001
Data Byte in the specified address 0xNN
11.8.6 I
2
C Memory Write
The I
2
C memory write command tells the bootcode to write data to the specified address.
bmRequestType USB_REQ_TYPE_DEVICE |
USB_REQ_TYPE_VENDOR |
USB_REQ_TYPE_OUT
01000000b
bRequest BTC_I2C_MEMORY_WRITE 0x93
wValue HI: should be zero
LO: Data
0x00NN
wIndex Data address 0xNNNN (From 0x0000 to 0xFFFF)
wLength None 0x0000
Data None