TNETX15AEPGE Datasheet, PDF (32/79 Pages) Texas Instruments – ADDRESS-LOOKUP DEVICE

TNETX15AE
ADDRESS-LOOKUP DEVICE
SPWS041A – AUGUST 1997 – REVISED OCTOBER 1997
add routing code register, addport at 0x3E–0x3F (DIO)
The addport register is used to set or change port and flag assignments for the node address contained in the
addnode register. The definition for the addport register depends on whether the address stored in the addnode
register is a unicast or multicast address.
This interface is used by the host to enter broadcast, multicast, and unicast addresses to the TNETX15AE table.
Wire ADDs operate on packet-source addresses, and all of these are forced to unicast addresses.
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
Reserved SECURE LOCKED CUPLNK
PORTCODE
Reserved
Initial values after reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
BIT
15
14
13
12
11–8
7–0
NAME
Reserved
SECURE
LOCKED
CUPLINK
PORTCODE
Reserved
FUNCTION
Writes are ignored and read as 0.
Secured address flag. SECURE is used to change the security level for the address contained in the addnode register.
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.
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.
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. This field is
writeable, and can be used to redirect traffic.
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
Reserved
PORTFLAG
Initial values after reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
BIT
15
14–0
NAME
Reserved
PORTFLAG
FUNCTION
Writes are ignored and read as 0.
PORTFLAG for multicast. PORTFLAG is 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/TNETX3100 port
assignment.
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