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參數(shù)資料
| 型號： | VT6516 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 16/12 PORT 10/1000 ASE T/TX |
| 中文描述： | 16/12港口10/1000日月光噸/德克薩斯州 |
| 文件頁數(shù)： | 50/73頁 |
| 文件大小： | 440K |
| 代理商： | VT6516 |
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VIA Technologies, Inc.
Preliminary VT6516 Datarsheet
-
50-
* Base Address: 1400H
Addres
s
(offset
)
00H
bits of MAC address used as index for forwarding table
3’b000: use MAC address bit 10-0 (default)
3’b001: use MAC address bit 11-0
3’b010: use MAC address bit 12-0
3’b011: use MAC address bit 13-0
3’b100: use MAC address bit 14-0
others, use MAC address bit 10-0
Function
Register
Name
Bits
Defau
lt
Value
R/
W
This register specifies the lookup hash key. For example, if the
MAC address bits [14:0] is used as the hash key, there must be 32K
96-byte table entries necessary to be allocated in the upper part of
SRAM for destination MAC lookup and source MAC learning.
starting SRAM address register for forwarding table base
HASH_BITS
[2:0]
0
R/W
01-
03H
The forwarding table should be located above the linked buffer
entries in the SRAM. The starting address of the forwarding table is
specified by TBL_BASE in unit of 32-bit word. The occupied size is
determined by HASH_BITS. For example, if there are maximum
5461 buffers entries used for 8MB SDRAM, the minimum
forwarding table base is 5461*3 because each linked buffer entry is
of size 96 bits (3 words).
user configured Forwarding Mode
bit 0 – if using the specified forwarding mask without lookup
(default: 0, to take lookup without specified mask)
bit 1 – if not forwarding packets destined to congested ports
(default: 0, not to filter packets by congestion factors)
TBL_BASE
[18:0]
0
R/W
04H
If FWD_MODE[0] = 1, the incoming packets would not be
forwarded with table lookup. However, the USER_PM is used as
the forwarding mask if the incoming packets are not from the CPU
port. For broadcast & lookup-miss packets, the USER_PM is
returned by Forwarding Control to IO Control as the lookup result.
If FWD_MODE[1] = 1, the incoming packets would not be
forwarded to the congested ports whose congestion factors are larger
than 511.
USER configured Port Mask
FWD_MODE [1:0]
0
R/W
05-
07H
The USER_PM is used as the lookup result for the incoming packets
from Ethernet ports in the following cases:
FWD_MODE = 1
FWD_MODE = 0, VLAN is off, STP_STATE is “forward”, and this
is a broadcast packet or a lookup-miss packet
port mask for packets sent by CPU
USER_PM
[16:0]
0
R/W
08-
09H
The CPU_PM is used as the lookup result for the incoming packets
from the CPU port without regard to packet’s DMAC.
CPU_PM
[15:0]
0
R/W
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