成本竞争力ARCNET （ ANSI 878.1 ）控制器2K ×8片内RAM
6.8.2
异常Results:...............................................................................................................................43
6.9
振荡器............................................................................................................................................43
第7章
7.1
7.2
操作说明................................................ .......................................... 45
最大限度地保证RATINGS*......................................................................................................45
DC电气特性....................................................................................................45
第8章
第九章
9.1
9.2
10.1
10.2
时序DIAGRAMS............................................................................................................. 48
包装纲要................................................................................................................. 60
28引脚PLCC封装外形和Parameters.........................................................................................60
48引脚TQFP封装外形和Parameters.........................................................................................61
第10章
第11章
附录A........................................................................................................................ 62
NOSYNC位...........................................................................................................................................62
EF Bit......................................................................................................................................................62
附录B:....................................................................................................................... 65
图列表
图3.1 - COM20019I操作........................................................................................................................10
图5.1 - 复用的，带RS- 485接口................................... 8051 - LIKE总线接口......... 16
图5.2 - 非复用，带RS- 485接口................................. 6801 - LIKE总线接口..17
图5.3 - 高速CPU总线时序 - INTEL CPU模式...................................... ...................................... 18
图5.4 - COM20019I网络采用RS- 485差分收发器....................................... .... 20
图5.5 - 内部框图..................................................................................................................21
图6.1 - 顺序存取操作......................................................................................................35
图6.2 - RAM缓冲器分组配置........................................... .................................................. 37
图6.3 - 命令链状态寄存器队列.......................................... .................................... 39
图7.1 - 交流测量..............................................................................................................................47
图8.1 - 复用总线， 68XX般的控制信号;读周期................................................ 0.48
图8.2 - 复用总线， 80XX般的控制信号;读周期................................................ 0.49
图8.3 - 复用总线， 68XX般的控制信号;写周期................................................ 50
图8.4 - 复用总线， 80XX般的控制信号;写周期................................................ 51
图8.5 - 非复用总线， 80XX般的控制信号;读周期........................................ 52
图8.6 - 非复用总线， 80XX般的控制信号;读周期........................................ 53
图8.7 - 非复用总线， 68XX般的控制信号;读周期........................................ 54
图8.8 - 非复用总线， 68XX般的控制信号;读周期........................................ 55
图8.9 - 非复用总线， 80XX般的控制信号;写周期...................................... 56
图8.10 - 非复用总线， 68XX般的控制信号;写周期.................................... 57
图8.11 - BACKPLANE方式发送或接收时序......................................... .............................. 58
图8.12 - TTL输入TIMING ON引脚XTAL1 .......................................................................................................59
图8.13 - 复位和中断时序........................................................................................................59
图10.1 - 效果EB一下就TA / RI位的.................................... .................................................. ..63
图11.1 - 例如接口电路原理图到ISA总线....................................... ...................... 65
表格清单
表5.1 - 典型媒体.............................................................................................................................................22
表6.1 - 已读Summary.............................................................................................................................23
表6.2 - 写寄存器汇总............................................................................................................................24
表6.3 - 状态寄存器...........................................................................................................................................27
表6.4 - 诊断状态Register..........................................................................................................................28
表6.5 - 命令Register.....................................................................................................................................29
表6.6 - 地址指针寄存器高....................................................................................................................30
表6.7 - 地址指针低Register.....................................................................................................................30
表6.8 - 子地址寄存器.................................................................................................................................31
表6.9 - 配置寄存器................................................................................................................................31
表6.10 - 设置寄存器1 .......................................................................................................................................32
表6.11 - 设置2注册.......................................................................................................................................33
牧师07年9月25日
第4页
SMSC COM20019I
数据表
SMSC [ SMSC CORPORATION ]
