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TNETX15VE 数据表(PDF) 40 Page - Texas Instruments |
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TNETX15VE 数据表(HTML) 40 Page - Texas Instruments |
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40 / 113 page  TNETX15VE VLAN-ENGINE ADDRESS-LOOKUP DEVICE SPWS028B – APRIL 1997 – REVISED SEPTEMBER 1997 40 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 If addnode is a unicast address, (addnode (40) = 0), addport is defined as follows: BYTE 3 BYTE 2 BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 NBLCK SECURE LOCKED CUPLNK PORTCODE NEW Reserved Initial Values After Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 BIT NAME FUNCTION 15 NBLCK Not-blocked indication. NBLCK sets the RXblock override function. • If NBLCK is set, frames destined for this node are forwarded even if the corresponding RXblock bit for the port is set. • If NBLCK is not set, frames are forwarded only if the RXblock bit for the port is not set. 14 SECURE Secured address flag. SECURE is used to change the security level for the address contained in the addnode register. 13 LOCKED Locked address flag. LOCKED locks/unlocks the address contained in the addnode register on an add operation. Locked addresses output a discard code on the EAM interface. 12 CUPLINK Copy frames to uplink flag. CUPLINK sets the copy uplink status for the address contained in the addnode register. Addresses tagged by this bit add the port (specified in the uplinkports register) to the routing code. 11–8 PORTCODE Current port code for address. The value in PORTCODE becomes the port to which packets (sent to this address) are forwarded. In addresses that are added automatically to the table, the source port goes to this field, and the VLAN assigned to that port becomes part of the address (see principles of operation, SRAM allocation, lookup table SRAM allocation). This field is writeable, and can be used to redirect traffic. However, losing the VLANid to port synchronization results in leaky VLANs. 7 NEW New-address indication. NEW changes the NEW field for the node contained in the addnode register. This address can now be found easily by a NEW find command. 6–0 Reserved Writes to this location are ignored and read as 0. If addnode is a multicast address, (addnode (40) = 1), addport is defined as follows: BYTE 3 BYTE 2 BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 NBLCK PORTFLAG Initial Values After Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 BIT NAME FUNCTION 15 NBLCK Not-blocked flag. NBLCK sets the RXblock register override for the multicast address contained in the addnode register. • If NBLCK is set, frames destined for this multicast address are forwarded even if the corresponding RXblock register bit for the port that originated the frame is set. • If NBLCK is not set, frames are forwarded only if the RXblock register bit for the port that originated the frame is not set. 14–0 PORTFLAG Current PORTFLAG for multicast. PORTFLAG changes the port assignment for the multicast address contained in the addnode register. The bit values in this field correspond one-to-one with the TNETX3150/TNETX3150A port assignment. It is the user’s responsibility not to put a value in this field that would cause leaky VLANs. |
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