參數(shù)資料
型號(hào)： MB86976PF-G
元件分類： 微控制器/微處理器
英文描述： 2 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP144
封裝： PLASTIC, QFP-144
文件頁(yè)數(shù)： 9/46頁(yè)
文件大小： 212K
代理商： MB86976PF-G
MB86976
Fujitsu Microelectronics, Inc.
17
Advanced 11/5/98
where:
There are several types of FIFO within the MB86976 Some are
“virtual” FIFOs existing within the Frame Buffer Database and
are not separate physical entities, while others are physical register
buffers between the internal LAN and WAN ports and the memory
interface module. All these FIFOs are essentially transparent to the
user, apart from some initialization of the DRAM-based FIFOs.
Source Address Database
The Source Address Database stores a maximum of 8K entries.
Each DRAM-based 4 word entry is addressed using the 18 bit
address format shown in the table below. The hash value is
calculated using the algorithm in “Hashing Algorithm” on
page 20.
where:
The format of Source Address Database entries is shown in the
table below. Each entry is comprised of four 16-bit words: one
header and three data words.
Source Address Database Entry Format
where:
The action of the destination field value depends on the source of
the frame, and other filtering criteria discussed in “Filtering” on
page 18, but is summarized below.
Bit Field
Description
length
Number of bytes in the frame.
E.g., a maximum length Ethernet frame would have
1518 bytes, including CRC; therefore, the length field
would be set to 5EEh.
destination
000 = reject
001 = forward to processor
010 = forward to LAN port
100 = forward to WAN port
011 = forward to processor and LAN port
101 = forward to processor and WAN port
110 = forward to LAN port and WAN port
111 = in use
source
00 = processor
01 = LAN receive port
10 = WAN receive port
11 = unused
data value
Data field.
In the event that the length of the frame is an odd
number of bytes, the last eight bits of the frame are
located at bit[7:0]
bit[17:15]
bit[14:5]:
bit[4:2]
bit[1:0]
base address
hash value
entry select
word select
Field
Description
base address
Fixed at 7h (DRAM address 224k).
hash value
Selects one of 1024 “buckets”. Generated from
the hash of the Destination Address.
entry select
Selects one of 8 SADB entries in the given
“bucket”.
word select
Selects one of four 16-bit words associated
with the given SADB entry.
bit[15:6]
bit[5:3]
bit[2]
bit[1]
bit[0]
spare
destination
dynamic
valid
time-
stamp
source address[40:47], source address[32:39]
source address[24:31], source address[16:23]
source address[8:15], source address[0:7]
Field
Description
spare
Unused at this time
destination
Frame destination value (see below)
dynamic
0 = this Source Address is a static entry
1 = this Source Address was auto-learned
valid
0 = entry is invalid
1 = entry is valid
timestamp
1-bit value indicating the relative age of the entry.
destin
value
Frame from LAN
Frame from WAN
none
WAN & autolearn
LAN
000
reject (default for auto-learned
entries)
LAN
001
CPU & WAN
CPU
100
WAN
reject
101
CPU&WAN
CPU
111
(invalid)
Field
Description
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