参数资料
型号: COM20019ILJP
厂商: STANDARD MICROSYSTEMS CORP
元件分类: 微控制器/微处理器
中文描述: 1 CHANNEL(S), 312.5K bps, LOCAL AREA NETWORK CONTROLLER, PQCC28
封装: PLASTIC, LCC-28
文件页数: 6/65页
文件大小: 386K
代理商: COM20019ILJP
Cost Competitive ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
Rev. 09-25-07
Page 14
SMSC COM20019I
DATASHEET
An ALERT BURST
An SOH (Start Of Header--ASCII code 01H)
An SID (Source ID) character
Two (repeated) DID (Destination ID) characters
A single COUNT character which is the 2's complement of the number of data bytes to follow if a
short packet is sent, or 00H followed by a COUNT character if a long packet is sent.
N data bytes where COUNT = 256-N (or 512-N for a long packet)
Two CRC (Cyclic Redundancy Check) characters. The CRC polynomial used is: X
16 + X15 + X2 + 1.
ALERT
BURST
SOH
SID
DID
COUNT
data
CRC
4.6.4
Acknowledgements
An Acknowledgement is used to acknowledge reception of a packet or as an affirmative response to FREE
BUFFER ENQUIRIES and is sent by the following sequence:
An ALERT BURST
An ACK (ACKnowledgement--ASCII code 86H) character
ALERT BURST
ACK
4.6.5
Negative Acknowledgements
A Negative Acknowledgement is used as a negative response to FREE BUFFER ENQUIRIES and is sent
by the following sequence:
An ALERT BURST
A NAK (Negative Acknowledgement--ASCII code 15H) character
ALERT BURST
NAK
相关PDF资料
PDF描述
CP0603A2442CSTR
CP0805A0881ESTR
CP0805A1441BSTR
CP2101-GMR
CP2101
相关代理商/技术参数
参数描述
COM20019I-LJP 制造商:SMSC 制造商全称:SMSC 功能描述:Low Cost ARCNET(ANSI 878.1) Controller with 2k X 8 On-Board RAM
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