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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  
4.4.21 Register 18: Bus Status  
(BusST, Read-only, Address: PacketPage base + 0138h)  
7
6
5
4
3
2
1
9
0
TxBidErr  
011000  
F
E
D
C
B
A
8
Rdy4Tx NOW  
BusST describes the status of the current transmit operation.  
011000  
These bits provide an internal address used by the CS8900A to identify this as the Bus Status  
Register. When reading this register, these bits will be 011000, where the LSB corresponds to  
Bit 0.  
TxBidErr  
If set, the host has commanded the CS8900A to transmit a frame that the CS8900A will not  
send. Frames that the CS8900A will not send are:  
1) Any frame greater than 1514 bytes, provided that InhibitCRC  
(Register 9, TxCMD, Bit C) is clear.  
2) Any frame greater than 1518 bytes.  
Note that this bit is not set when transmit frames are too short.  
Rdy4TxNOW  
Rdy4TxNOW signals the host that the CS8900A is ready to accept a frame from the host for  
transmission. This bit is similar to Rdy4Tx (Register C, BufEvent, Bit 8) except that there is no  
interrupt associated with Rdy4TxNOW. The host can poll the CS8900A and check  
Rdy4TxNOW to determine if the CS8900A is ready for transmit. (See Section 5.7 on page 99  
for a description of the transmit bid process.)  
Reset value is: 0000 0000 0001 1000  
CIRRUS LOGIC PRODUCT DATA SHEET  
68  
DS271PP3  
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