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TNETX15VE Datasheet(PDF) 4 Page - Texas Instruments |
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TNETX15VE Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 113 page  TNETX15VE VLAN-ENGINE ADDRESS-LOOKUP DEVICE SPWS028B – APRIL 1997 – REVISED SEPTEMBER 1997 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 general description bus watcher The bus watcher interfaces to the TNETX3150/TNETX3150A DRAM interface and extracts destination, source addresses, VLAN information, and the originating port number. The bus watcher is responsible for identifying the frame’s start-of-frame and end-of-frame tags. It also interfaces to the arbiter and the TNETX15VE logic to perform off-the-wire address LOOKUPs and ADDs. DIO interface The DIO interface enables an attached microprocessor to access the TNETX15VE internal registers. The DIO interface is used to select control modes, read statistics, receive interrupts, read/write to attached MII devices, read/write to an attached EEPROM, and perform management LOOKUPs, ADDs, and DELETEs. EEPROM interface The EEPROM interface allows accesses to the EEPROM. It also interfaces with the EEPROM for automatic loading of selected registers from the EEPROM at startup or reset. arbiter The arbiter manages the SRAM access for the TNETX15VE logic operations by assigning priorities to the logic operations. Wire lookups have the highest priority, followed by DELETEs, ADDs, management LOOKUPs, and AGEs. The individual logic operations request the bus by asserting a request signal. The arbiter grants the SRAM bus by controlling the SRAM-bus address/data multiplexer. SRAM address/data multiplexer (MUX) The address/data MUX is controlled by the arbiter and selects the logic operation that has ownership of the SRAM bus. TNETX15VE logic operations The TNETX15VE logic operations consist of LOOKUP, DELETE, ADD, FIND, and AGE operations. Each logic operation is assigned a priority on the SRAM bus and is controlled by the arbiter. The LOOKUP operation has the highest priority and is responsible for wire lookups. The DELETE operation is responsible for either deletes from the AGE operation or for management-delete requests. The ADD operation is responsible for wire adds as well as for management-add requests. The FIND operation is responsible for management searches of the lookup table. The AGE operation is responsible for deleting addresses that have no activity in a fixed time period. |
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