5Mbps的ARCNET （ ANSI 878.1 ）控制器2K ×8片内RAM
数据表
6.8
改进Diagnostics.................................................................................................................................48
6.8.1
正常Results:...................................................................................................................................48
6.8.2
异常Results:...............................................................................................................................48
6.9
振荡器....................................................................................................................................................49
第7章
7.1
7.2
操作Description........................................................................................................ 50
最大保证额定值* .................................................................................................................50
直流电气Characteristics......................................................................................................................50
第8章
时序图.................................................................................................................. 53
第九章
包装纲要................................................................................................................. 66
附录A.................................................................................................................................................. 68
附录B - 接口电路原理图的示例，以ISA总线....................................... ...................... 71
附录C - 的COM20020版本B ， C版本和修订版D ................................ 72的软件识别
图列表
图2.1 - 引脚配置 - COM20020I 28引脚PLCC ....................................... .................................................. 7 ...
图2.2 - 引脚配置 - COM20020I 48引脚TQFP ....................................... .................................................. 8 ...
图3.1 - COM20020ID操作...........................................................................................................................11
图5.1 - 复用的，类似8051的总线接口， RS - 485接口................................... ................................. 18
图5.2 - 非复用， 6801样总线接口与RS - 485接口................................. ........................... 19
图5.3 - 高速CPU总线时序 - 英特尔CPU模式...................................... ................................................ 20
图5.4 - COM20020ID网络采用RS - 485差分收发器....................................... ........................ 22
图5.5 - 双脉冲波形的数据1-1-0.........................................................................................................22
图5.6 - 内部模块Diagram..............................................................................................................................24
图6.1 - 顺序访问Operation.....................................................................................................................39
图6.2 - 内存缓冲数据包配置.............................................................................................................42
图6.3 - 命令链接状态寄存器Queue..............................................................................................44
图8.1 - 复用总线， 68XX样控制信号;读周期................................................ ........................ 53
图8.2 - 复用总线， 80XX样控制信号;读周期................................................ ........................ 54
图8.3 - 复用总线， 68XX样控制信号;写周期................................................ ......................... 55
图8.4 - 复用总线， 80XX样控制信号;写周期................................................ ......................... 56
图8.5 - 非复用总线， 80XX样控制信号;读周期................................................ ................. 57
图8.6 - 非复用总线， 80XX样控制信号;读周期................................................ ................. 58
图8.7 - 非复用总线， 68XX样控制信号;读周期................................................ ................. 59
图8.8 - 非复用总线， 68XX样控制信号;读周期................................................ ................. 60
图8.9 - 非复用总线， 80XX样控制信号;写周期................................................ ................. 61
图8.10 - 非复用总线， 68XX样控制信号;写周期................................................ ............... 62
图8.11 - 正常模式发送或接收Timing..............................................................................................63
图8.12 - 背板模式发送或接收时序......................................... ............................................... 64
图8.13 - TTL输入时序上XTAL1 Pin..............................................................................................................65
图8.14 - 复位和中断时序.....................................................................................................................65
图9.1 - 28引脚PLCC封装Dimensions...........................................................................................................66
图9.2 - 48引脚TQFP封装Outline..................................................................................................................67
图0.1 - 在TA / RI的EF位的影响。 Bit..........................................................................................................70
表格清单
表5.1 - 典型Media.............................................................................................................................................24
表6.1 - 已读Summary............................................................................................................................26
表6.2 - 写寄存器汇总............................................................................................................................27
表6.3 - 状态寄存器...........................................................................................................................................31
表6.4 - 诊断状态Register..........................................................................................................................32
表6.5 - 命令Register.....................................................................................................................................33
表6.6 - 地址指针寄存器高....................................................................................................................34
表6.7 - 地址指针低Register.....................................................................................................................34
表6.8 - 子地址寄存器.................................................................................................................................34
表6.9 - 配置寄存器................................................................................................................................35
修订06年12月5日
第4页
SMSC COM20020I版D
数据表
SMSC [ SMSC CORPORATION ]
