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CS8900A-IQ3 参数 Datasheet PDF下载

CS8900A-IQ3图片预览
型号: CS8900A-IQ3
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  
4.4.8 Register 5: Receiver Control  
(RxCTL, Read/Write, Address: PacketPage base +0104h)  
7
6
5
4
3
2
1
0
PromiscuousA  
IAHashA  
000101  
F
E
D
C
B
A
9
8
ExtradataA  
RuntA  
CRCerrorA  
BroadcastA  
IndividualA  
MulticastA  
RxOKA  
RxCTL has two functions: Bits 8, C, D, and E define what types of frames to accept. Bits 6, 7, 9, A, and B configure  
the Destination Address filter. See Section 5.3 on page 87.  
000101  
These bits provide an internal address used by the CS8900A to identify this as the Receiver  
Control Register. For a received frame to be accepted, the Destination Address of that frame  
must pass the filter criteria found in Bits 6, 7, 9, A, and B (see Section 5.3 on page 87).  
IAHashA  
When set, receive frames are accepted when the Destination Address is an Individual Address  
that passes the hash filter.  
PromiscuousA  
RxOKA  
Frames with any address are accepted when this bit is set.  
When set, the CS8900A accepts frames with correct CRC and valid length (valid length is: 64  
bytes <= length <= 1518 bytes).  
MulticastA  
IndividualA  
When set, receive frames are accepted if the Destination Address is an Multicast Address that  
passes the hash filter.  
When set, receive frames are accepted if the Destination Address matches the Individual Ad-  
dress found at PacketPage base + 0158h to PacketPage base + 015Dh.  
BroadcastA  
CRCerrorA  
When set, receive frames are accepted if the Destination Address is FFFF FFFF FFFFh.  
When set, receive frames that pass the Destination Address filter, but have a bad CRC, are ac-  
cepted. When clear, frames with bad CRC are discarded. See Note 5.  
RuntA  
When set, receive frames that are smaller than 64 bytes, and that pass the Destination Address  
filter are accepted. When clear, received frames less that 64 bytes in length are discarded. The  
CS8900A discards any frame that is less than 8 bytes. See Note 5.  
ExtradataA  
When set, receive frames longer than 1518 bytes and that pass the Destination Address filter  
are accepted. The CS8900A accepts only the first 1518 bytes and ignores the rest. When clear,  
frames longer than 1518 bytes are discarded. See Note 5.  
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 5.3 on page 87.  
Reset value is: 0000 0000 0000 0101  
Notes: 5. Typically, when bits CRCerrorA, RuntA and ExtradataA are cleared (meaning bad frames are being  
discarded), then the corresponding bits CRCerroriE, RuntiE and ExtradataiE should be set in register 3  
(Receiver Configuration register) to allow the device driver to keep track of discarded frames.  
CIRRUS LOGIC PRODUCT DATA SHEET  
DS271PP3  
55  
 
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