전자부품 데이터시트 검색엔진
  Korean  ▼

Delete All
ON OFF
ALLDATASHEET.CO.KR

X  

Preview PDF Download HTML

LAN9117 데이터시트(HTML) 40 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) 40 Page - Microchip Technology

Zoom Inzoom in Zoom Outzoom out
/ 114 page
 40 / 114 page
background image
LAN9117
DS00002267A-page 40
 2005-2016 Microchip Technology Inc.
3.13.2.1
TX Command ‘A’
3.13.2.2
TX Command ‘B’
TABLE 3-11:
TX COMMAND 'A' FORMAT
Bits
Description
31
Interrupt on Completion. When set, the TXDONE flag will be asserted when the current buffer has
been fully loaded into the TX FIFO. This flag may be optionally mapped to a host interrupt.
30:26
Reserved. These bits are reserved. Always write zeros to this field to provide future compatibility.
25:24
Buffer End Alignment. This field specifies the alignment that must be maintained on the last data
transfer of a buffer. The host will add extra DWORDs of data up to the alignment specified in the table
below. The LAN9117 will remove the extra DWORDs. This mechanism can be used to maintain cache
line alignment on host processors.
23:21
Reserved. These bits are reserved. Always write zeros to this field to provide future compatibility
20:16
Data Start Offset (bytes). This field specifies the offset of the first byte of TX data. The offset value
can be anywhere from 0 bytes to 31 a Byte offset.
15:14
Reserved. These bits are reserved. Always write zeros to this field to provide future compatibility
13
First Segment. When set, this bit indicates that the associated buffer is the first segment of the packet.
12
Last Segment. When set, this bit indicates that the associated buffer is the last segment of the packet
11
Reserved. These bits are reserved. Always write zeros to this field to provide future compatibility.
10:0
Buffer Size (bytes). This field indicates the number of bytes contained in the buffer following this
command. This value, along with the Buffer End Alignment field, is read and checked by the LAN9117
and used to determine how many extra DWORD’s were added to the end of the Buffer. A running
count is also maintained in the LAN9117 of the cumulative buffer sizes for a given packet. This
cumulative value is compared against the Packet Length field in the TX command ‘B’ word and if they
do not correlate, the TXE flag is set.
Note:
The buffer size specified does not include the buffer end alignment padding or data start off-
set added to a buffer.
TABLE 3-12:
TX COMMAND 'B' FORMAT
Bits
Description
31:16
Packet Tag. The host should write a unique packet identifier to this field. This identifier is added to
the corresponding TX status word and can be used by the host to correlate TX status words with their
corresponding packets.
Note:
The use of packet tags is not required by the hardware. This field can be used by the LAN
software driver for any application. Packet Tags is one application example.
15:14
Reserved. These bits are reserved. Always write zeros to this field to provide future compatibility.
13
Add CRC Disable. When set, the automatic addition of the CRC is disabled.
[25]
[24]
End Alignment
0
0
4-byte alignment
0
1
16-byte alignment
1
0
32-byte alignment
11
Reserved


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