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TNETX15VE 数据表(PDF) 29 Page - Texas Instruments

部件名 TNETX15VE
功能描述  VLAN-ENGINE ADDRESS-LOOKUP DEVICE
PDF  113 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

TNETX15VE 数据表(HTML) 29 Page - Texas Instruments

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TNETX15VE
VLAN-ENGINE ADDRESS-LOOKUP DEVICE
SPWS028B – APRIL 1997 – REVISED SEPTEMBER 1997
29
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
lookup routing-code register, findport at 0x12–0x13 (DIO) (continued)
If findnode is a multicast address, findnode (40) = 1 (bit 40 of the Ethernet address is 1):
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 indication. NBLCK overrides the RXblock register.
• If NBLCK is 1, frames destined to this node are forwarded even if the corresponding RXblock bit for
the port that originated the frame is set.
• If NBLCK is 0, frames are forwarded only if the RXblock bit for the port that originated the frame is
not set.
14–0
PORTFLAG
Port-bit vector for multicast. PORTFLAG shows the port-bit vector for the multicast address contained in
the findnode register. The bit values in this field correspond one-to-one with the TNETX3150/TNETX3150A
port assignment.
If the FIND operation used the NBFR bit, findport is defined:
The findport register returns the following information when performing NBFR operations (reading the RX
FIFO for frames whose destination address is tagged by the NBLCK bit).
BYTE 3
BYTE 2
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
TAG
PORT CODE
Reserved
Initial Values After Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
BIT
NAME
FUNCTION
15–12
TAG
Frame’s tag field. TAG shows the frame’s tag for the frame shown in the findnode register as decoded from
the DRAM bus. The TAG field is used by the TNETX15VE to determine the VLAN for a frame coming from
port 00.
11–8
PORT CODE
Port code for source address. PORT CODE shows the source port for the frame coming from the address
in the findnode register.
7–0
Reserved
Writes to this location are ignored and are read as 0.
node’s age-stamp register, findnodeage at 0x14–0x15 (DIO)
BYTE 1
BYTE 0
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
NODEAGE
Initial Values After Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
The findnodeage register is a read-only register, which holds the current 16-bit age-time stamp of the address
contained in the findnode register and findVLANID register after a FIND operation. Age units are seconds. The
time stamp indicates when this address was last seen.



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