W5500 数据手册 版本 1.0 (2013 八月) 5 / 67
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1.1 引脚描述 ....................................................................................... 8
2
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2.1 SPI 工作模式 ................................................................................. 14
2.2 SPI 数据帧 ................................................................................... 15
2.2.1 地址段 .................................................................................. 15
2.2.2 控制段 .................................................................................. 16
2.2.3 数据段 .................................................................................. 18
2.3 可变数据长度模式（VDM）Variable Length Data Mode (VDM) ...................... 18
2.3.1 写访问——VDM 模式 .................................................................. 19
2.3.2 读访问——VDM 模式 .................................................................. 22
2.4 固定数据长度模式（FDM）Fixed Length Data Mode (FDM) ......................... 25
2.4.1 写访问——FDM 模式 Write Access in FDM ........................................ 26
2.4.2 读访问——FDM 模式 Read Access in FDM ......................................... 27
3
Register and Memory Organization ........................................ 28
3.1 通用寄存器区 Common Register Block ................................................. 30
3.2 Socket 寄存器区 Socket Register Block ............................................... 31
3.3 内存 Memory................................................................................ 32
4
Register Descriptions .................................................................. 33
4.1 通用寄存器 Common Registers .......................................................... 33
4.2 Socket 端口寄存器 Socket Registers .................................................... 45
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................................................................................................. 59
5.1 绝对最大额定值 ............................................................................. 59
5.2 绝对最大额定值 (电气灵敏度) ........................................................... 59
5.3 直流特性 ..................................................................................... 61
5.4 功耗 Power Dissipation ................................................................... 62
5.5 交流特性 ..................................................................................... 62
5.5.1 复位时钟 ............................................................................... 62
5.5.2 唤醒时间 ............................................................................... 62
5.5.3 晶体特性 ............................................................................... 63
5.5.4 SPI 时钟 ................................................................................ 63
5.5.5 变压器特性 ............................................................................ 65
5.5.6 极性变换 MDIX ........................................................................ 65
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