전자부품 데이터시트 검색엔진
  Korean  ▼

Delete All
ON OFF
ALLDATASHEET.CO.KR

X  

Preview PDF Download HTML

LAN9117 데이터시트(HTML) 20 Page - Microchip Technology

부품명 LAN9117
상세내용  High Performance Single-Chip 10/100 Non-PCI Ethernet Controller
Download  114 Pages
Scroll/Zoom Zoom In 100% Zoom Out
제조사  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo 

LAN9117 데이터시트(HTML) 20 Page - Microchip Technology

Zoom Inzoom in Zoom Outzoom out
/ 114 page
 20 / 114 page
background image
LAN9117
DS00002267A-page 20
 2005-2016 Microchip Technology Inc.
3.3
Address Filtering Functional Description
The Ethernet address fields of an Ethernet Packet, consists of two 6-byte fields: one for the destination address and
one for the source address. The first bit of the destination address signifies whether it is a physical address or a multicast
address.
The LAN9117 address check logic filters the frame based on the Ethernet receive filter mode that has been enabled.
Filter modes are specified based on the state of the control bits in Table 3-1, "Address Filtering Modes", which shows
the various filtering modes used by the Ethernet MAC Function. These bits are defined in more detail in the “MAC Con-
trol Register”. Please refer to Section 5.4.1, "MAC_CR—MAC Control Register," on page 80 for more information on
this register.
If the frame fails the filter, the Ethernet MAC function does not receive the packet. The host has the option of accepting
or ignoring the packet.
3.4
Filtering Modes
3.4.1
PERFECT FILTERING
This filtering mode passes only incoming frames whose destination address field exactly matches the value pro-
grammed into the MAC Address High register and the MAC address low register. The MAC address is formed by the
concatenation of the above two registers in the MAC CSR Function.
3.4.2
HASH ONLY FILTERING
This type of filtering checks for incoming Receive packets with either multicast or physical destination addresses, and
executes an imperfect address filtering against the hash table.
During imperfect hash filtering, the destination address in the incoming frame is passed through the CRC logic and the
upper six bits of the CRC register are used to index the contents of the hash table. The hash table is formed by merging
the register’s multicast hash table high and multicast hash table low in the MAC CSR Function to form a 64-bit hash
table. The most significant bit determines the register to be used (High/Low), while the other five bits determine the bit
within the register. A value of 00000 selects Bit 0 of the multicast hash table low register and a value of 11111 selects
Bit 31 of the multicast hash table high register.
3.4.2.1
Hash Perfect Filtering
In hash perfect filtering, if the received frame is a physical address, the LAN9117 Packet Filter block perfect-filters the
incoming frame’s destination field with the value programmed into the MAC Address High register and the MAC Address
Low register. If the incoming frame is a multicast frame, however, the LAN9117 packet filter function performs an imper-
fect address filtering against the hash table.
The imperfect filtering against the hash table is the same imperfect filtering process described in the “Hash Only Filter-
ing” section above.
TABLE 3-1:
ADDRESS FILTERING MODES
MCPAS
PRMS
INVFILT
HO
HPFILT
Description
0
0
0
0
0
MAC address perfect filtering only
for all addresses.
0
0
0
0
1
MAC address perfect filtering for
physical address and hash filtering
for multicast addresses
0
0
0
1
1
Hash Filtering for physical and
multicast addresses
0
0
1
0
0
Inverse Filtering
X
1
0
X
X
Promiscuous
1
0
0
0
X
Pass all multicast frames. Frames
with physical addresses are perfect-
filtered
1
0
0
1
1
Pass all multicast frames. Frames
with physical addresses are hash-
filtered


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42  43  44  45  46  47  48  49  50  51  52  53  54  55  56  57  58  59  60  61  62  63  64  65  66  67  68  69  70  71  72  73  74  75  76  77  78  79  80  81  82  83  84  85  86  87  88  89  90  91  92  93  94  95  96  97  98  99  100   ...More


데이터시트 Download




링크 URL



Privacy Policy
ALLDATASHEET.CO.KR
ALLDATASHEET 가 귀하에 도움이 되셨나요?  [ DONATE ]  

Alldatasheet는?   |   광고문의    |   운영자에게 연락하기   |   개인정보취급방침   |   즐겨찾기   |   링크교환   |   제조사별 검색
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn