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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  
4.4.10 Register 8: Transmitter Event  
(TxEvent, Read-only, Address: PacketPage base + 0218h)  
7
6
5
4
3
2
1
0
SQEerror  
Loss-of-CRS  
001000  
F
E
D
C
B
A
9
8
16coll  
Number-of-Tx-collisions  
Jabber  
Out-of-window  
TxOK  
TxEvent gives the event status of the last packet transmitted.  
001000  
These bits provide an internal address used by the CS8900A to identify this as the Transmitter  
Event Register.  
Loss-of-CRS  
If the CS8900A is transmitting on the AUI and doesn’t see Carrier Sense (CRS) at the end of  
the preamble, there is a Loss-of-Carrier error and this bit is set. If Loss-of-CRSiE (Register 7,  
TxCFG, Bit 6) is set, there is an interrupt.  
SQEerror  
TxOK  
At the end of a transmission on the AUI, the CS8900A expects to see a collision within 64 bit  
times. If this does not happen, there is an SQE error and this bit is set. If SQEerroriE (Register  
7, TxCFG, Bit 7) is set, there is an interrupt.  
This bit is set if the last packet was completely transmitted (Jabber (Bit A), out-of-window-colli-  
sion (Bit 9), and 16Coll (Bit F) must all be clear). If TxOKiE (Register 7, TxCFG, Bit 8) is set,  
there is an interrupt.  
Out-of-Window  
Jabber  
This bit is set if a collision occurs more than 512 bit times after the first bit of the preamble. When  
this occurs, the CS8900A forces a bad CRC and terminates the transmission. If Out-of-window-  
iE (Register 7, TxCFG, Bit 9) is set, there is an interrupt  
If the last transmission is longer than 26 msec, then the packet output is terminated by the jab-  
ber logic and this bit is set. If JabberiE (Register 7, TxCFG, Bit A) is set, there is an interrupt.  
#-of-TX-collisions These bits give the number of transmit collisions that occurred on the last transmitted packet.  
Bit B is the LSB. If AnycolliE (Register 7, TxCFG, Bit B) is set, there is an interrupt when any  
collision occurs.  
16coll  
This bit is set if the CS8900A encounters 16 normal collisions while attempting to transmit a  
particular packet. When this happens, the CS8900A stops further attempts to send that packet.  
If 16colliE (Register 7, TxCFG, Bit F) is set, there is an interrupt.  
Reset value is: 0000 0000 0000 1000  
Notes:  
1.In any event register, like TxEvent, all bits are cleared upon readout. The host is responsible for  
processing all event bits.  
2.TxOK (Bit 8) and the Number-of-Tx-Collisions (Bits E-B) are used in normal packet transmission.All  
other bits (6, 7, 9, A, and F) give the status of abnormal transmit operation.  
CIRRUS LOGIC PRODUCT DATA SHEET  
DS271PP3  
57  
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