COM20022I-3V 参数 Datasheet PDF下载

10 Mbps ARCNET (ANSI 878.1) Controller with 2Kx8 On-Board RAM

Datasheet

Figure 8.9 - Non-Multiplexed Bus, 80XX-Like Control Signals; Write Cycle.................................................................68

Figure 8.10 - Non-Multiplexed Bus, 80XX-Like Control Signals; Write Cycle ...............................................................69

Figure 8.11 - Non-Multiplexed Bus, 68XX-Like Control Signals; Write Cycle ...............................................................70

Figure 8.12 - Non-Multiplexed Bus, 68XX-Like Control Signals; Write Cycle ...............................................................71

Figure 8.13 - Normal Mode Transmit or Receive Timing..............................................................................................72

Figure 8.14 - Backplane Mode Transmit or Receive Timing ........................................................................................73

Figure 8.15 - TTL Input Timing on XTAL1 Pin..............................................................................................................74

Figure 8.16 - Reset and Interrupt Timing .....................................................................................................................74

Figure 8.17 - DMA Timing (Intel Mode 80XX) ..............................................................................................................75

Figure 8.18 - DMA Timing (Motorola Mode 68XX) .......................................................................................................76

Figure 8.19 - 48 Pin TQFP Package Outline ................................................................................................................79

Figure 9.1 - Effect of the EF Bit on the TA/RI Bit..........................................................................................................82

Figure 10.1 - Example of Interface of Circuit Diagram to ISA Bus................................................................................83

LIST OF TABLES

Table 5.1 - Typical Media .............................................................................................................................................29

Table 6.1 - Read Register Summary............................................................................................................................30

Table 6.2 - Data Register at 16 Bit Access ..................................................................................................................31

Table 6.3 - Write Register Summary ............................................................................................................................31

Table 6.4 - Data Register at 16 Bit Address .................................................................................................................32

Table 6.5 - Status Register ...........................................................................................................................................36

Table 6.6 - Diagnostic Status Register..........................................................................................................................37

Table 6.7 - Command Register.....................................................................................................................................38

Table 6.8 - Address Pointer High Register ....................................................................................................................39

Table 6.9 - Address Pointer Low Register.....................................................................................................................39

Table 6.10 - Sub Address Register ...............................................................................................................................40

Table 6.11 - Configuration Register ..............................................................................................................................40

Table 6.12 - Setup 1 Register .......................................................................................................................................42

Table 6.13 - Setup 2 Register .......................................................................................................................................43

Table 6.14 - Bus Control Register.................................................................................................................................44

Table 6.15 - DMA Count Register.................................................................................................................................45

Table 8.1 - DMA Timing................................................................................................................................................77

Table 8.2 - 48 Pin TQFP Package Parameters ............................................................................................................79

SMSC COM20022I 3V

Page 5

Revision 02-27-06

DATASHEET