VT6508 datasheet(28/48 Pages) ETC1

28 / 48 page

VIA Technologies, Inc.

Preliminary VT6508 Datasheet

-28-

EE_DATA[7:0] = 8’b0000_0000

2. Download Command:

EE_DATA[7:6] = 2’b01 è eeprom download data for a specific address

EE_DATA[5:0] è sequentially download data length from the following address

The next 2 EE_DATA will be Register base and offset address

Note that there must be an 8-bit check sum following the EOF command to make the sum of

all commands and this check-sum byte is equal to zero bits 0000-0000.

EEPROM memory layout:

EEPROM Address

Data[7:0]

00H

00H+1

00H+2

00H +3 ~

00H+2+1st_Data_Length(n)

- 1st Command[1:0](2’b01) + 1st_Data_Length[5:0] (1 <= n <= 63)

- CS_Module[7:0]

- IO_Write Start Address

- IO_Write_DATA[7:0] *n

00H+3+1st_Data_Length(n)

- 2

nd Command

- Ending Command[7:0]=8’b0000_0000 è End_of_file

Check_Sum

Note that EEPROM device id and address must be 7’b1010_001.

2.7 TRUNKING

There are two trunk groups in VT6508, one is port (0,1), another is port (6,7). Each one

can be enabled individually. The trunking load balance algorithm is as follows:

Assume DMAC=12'h000000000002, source_port_id = 4'b0001.

DMAC_forwarding_entry_address = hash algorithm(DMAC) * 2 + resident slot#

-----------------------------

-----------------

(hask key)

(0 or 1)

Assume the above value is 12'b000000011010 after lookup for DMAC =

12'h000000000002.

VT6508 Datasheet(PDF) 28 Page - List of Unclassifed Manufacturers