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TNETX15VE 数据表(PDF) 52 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) 52 Page - Texas Instruments

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TNETX15VE
VLAN-ENGINE ADDRESS-LOOKUP DEVICE
SPWS028B – APRIL 1997 – REVISED SEPTEMBER 1997
52
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
TNETX15VE DRAM and EAM interface (continued)
The TNETX15VE must determine the start of frame by looking at the flag in cycle 1. The flag is given in the
DD35–DD32 terminals. The SOF is shown in the following table in cycle 1 at bit (35–34) = 01b.
CYCLE
BIT
35
34
33
32
31
28
27
24
23
16
15
0
0
IOB
Parity
Tag
Channel code
Forward pointer†
1
0
1
Reserved
Most-significant 32 bits of destination address (DA)
2
Channel code
Most-significant 16 bits of source address (SA)
Least-significant
16 bits of DA
3
0
0
Reserved
Least-significant 32 bits of SA



Flags


Data



N–1
EOB
Valid bytes
Data
N
EOF
Frame status
CRC
† These bits are ignored by the TNETX15VE.
The TNETX15VE cycle begins when it latches the partial destination address to begin the table lookup, and
ends when it outputs an EAM code within the allocated 440 ns after the SOF condition is met.
The channel-code field in the flags of the body of the frame is exactly the same as that in the forward pointer.
The TNETX15VE uses the channel code from the forward pointer.
tag field
The tag field in the forward pointer comes from the port 00 pretag; that is, this field is defined only if the packet
source port is 00. Figure 3 shows the tag in relation to the rest of the frame. Please consult the latest
TNETX3150/TNETX3150A documentation for additional information.
M00RCLK
M00RXD7–
M00RXD0
Don’t Care
01
Tag
DA, SA, Data, CRC
M00RXDV
Don’t Care
1-Byte Tag Field Added to the Frame
Note at 200 Mbit/s, No Preamble is Transmitted.
Figure 3. Field Format for Uplink-Port Receive (RX) Frames
The pretag byte format is as follows:
BIT
7
6
5
4
3
2
1
0
Reserved
Source port number



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