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CS8900A-IQ 参数 Datasheet PDF下载

CS8900A-IQ图片预览
型号: CS8900A-IQ
PDF下载: 下载PDF文件 查看货源
内容描述: 水晶局域网? ISA以太网控制器 [Crystal LAN ⑩ ISA Ethernet Controller]
分类和应用: 控制器局域网以太网
文件页数/大小: 128 页 / 1360 K
品牌: CIRRUS [ CIRRUS LOGIC ]
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CS8900A  
Crystal LAN™ ISA Ethernet Controller  
4.4.6 Register 3: Receiver Configuration  
(RxCFG, Read/Write, Address: PacketPage base + 0102h)  
7
6
5
4
3
2
1
9
0
StreamE  
Skip_1  
000011  
F
E
D
C
B
A
8
ExtradataiE  
RuntiE  
CRCerroriE  
BufferCRC AutoRx DMAE RxDMA only  
RxOKiE  
RxCFG determines how frames will be transferred to the host and what frame types will cause interrupts.  
000011  
These bits provide an internal address used by the CS8900A to identify this as the Reveiver  
Configuration Register.  
Skip_1  
When set, this bit causes the last committed received frame to be deleted from the receive buff-  
er. To skip another frame, the host must rewrite a “1” to this bit. This bit is not to be used if  
RxDMAonly (Bit 9) is set. Skip_1 is an Act-Once bit. See Section 5.2.5 on page 84.  
StreamE  
RxOKiE  
When set, StreamTransfer mode is used to transfer receive frames that are back-to-back and  
that pass the Destination Address filter (see Section 5.3 on page 87). When StreamE is clear,  
StreamTransfer mode is not used. This bit must not be set unless either bit AutoRxDMA or bit  
RXDMAonly is set.  
When set, there is an RxOK Interrupt if a frame is received without errors. RxOK interrupt is  
not generated when DMA mode is used for frame reception.  
RxDMAonly  
The Receive-DMA mode is used for all receive frames when this bit is set.  
AutoRxDMAE  
When set, the CS8900A will automatically switch to Receive-DMA mode if the conditions spec-  
ified in Section 5.5 on page 93 are met. RxDMAonly (Bit 9) has precedence over AutoRxD-  
MAE.  
BufferCRC  
When set, the received CRC is included with the data stored in the receive-frame buffer, and  
the four CRC bytes are included in the receive-frame length (PacketPage base + 0402h). When  
clear, neither the receive buffer nor the receive length include the CRC.  
CRCerroriE  
RuntiE  
When set, there is a CRCerror Interrupt if a frame is received with a bad CRC.  
When set, ther is a Runt Interrupt if a frame is received that is shorter than 64 bytes. The  
CS8900A always discards any frame that is shorter than 8 bytes.  
ExtradataiE  
When set, there is an Extradata Interrupt if a frame is received that is longer than 1518 bytes.  
The operation of this bit is independent of the received packet integrity (good or bad CRC).  
After reset, if no EEPROM is found by the CS8900A, then the register has the following initial state. If an EEPROM  
is found, then the register’s initial value may be set by the EEPROM. See Section 3.3 on page 19.  
Reset value is: 0000 0000 0000 0011  
CIRRUS LOGIC PRODUCT DATA SHEET  
DS271PP3  
53