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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  
LinkOK  
(to MAC)  
10BASE-T Transceiver  
Link Pulse  
Detector  
RX Squelch  
RXSQL  
RX  
RXD-  
RXD+  
RX  
Comparator  
RX Filters  
ENDEC  
TXD-  
TX  
TX Pre-  
Distortion  
TX Filters  
TX Drivers  
TXD+  
Filter Tuning  
Figure 13. 10BASE-T Transceiver  
3.10.4 Interface Selection  
the AUI. Whenever the AUI is selected, the  
10BASE-T receiver remains active to listen for link  
pulses or packets. If 10BASE-T activity is detect-  
ed, the CS8900A switches back to 10BASE-T.  
Physical interface selection is determined by AUI-  
only bit (Bit 8) and the AutoAUI/10BT (Bit 9) in  
the LineCTL register (Register 13). Table 11 de-  
scribes the possible configurations.  
3.11 10BASE-T Transceiver  
AUIonly  
(Bit 8)  
AutoAUI/10BT  
(Bit 9)  
Physical  
Interface  
The CS8900A includes an integrated 10BASE-T  
transceiver that is compliant with the relevant por-  
tions of section 14 of the Ethernet standard  
(ISO/IEC 8802-3, 1993). It includes all analog and  
digital circuitry needed to interface the CS8900A  
directly to a simple isolation transformer (see  
Section 7.5 on page 120 for a connection diagram).  
Figure 13 provides a block diagram of the  
10BASE-T transceiver.  
0
1
0
0
N/A  
1
10BASE-T Only  
AUI Only  
Auto-Select  
Table 11. Interface Selection  
3.10.4.1 10BASE-T Only  
When configured for 10BASE-T only operation,  
the 10BASE-T transceiver and its interface to the  
ENDEC are active, and the AUI is powered down.  
3.11.1 10BASE-T Filters  
The CS8900A’s 10BASE-T transceiver includes  
integrated low-pass transmit and receive filters,  
eliminating the need for external filters or a fil-  
ter/transformer hybrid. On-chip filters are gm/c im-  
plementations of fifth-order Butterworth low-pass  
filters. Internal tuning circuits keep the gm/c ratio  
tightly controlled, even when large temperature,  
supply, and IC process variations occur. The nom-  
inal 3 dB cutoff frequency of the filters is 16 MHz,  
and the nominal attenuation at 30 MHz (3rd har-  
monic) is -27 dB.  
3.10.4.2 AUI Only  
When configured for AUI-only operation, the AUI  
and its interface to the ENDEC are active, and the  
10BASE-T transceiver is powered down.  
3.10.4.3 Auto-Select  
In Auto-Select mode, the CS8900A automatically  
selects the 10BASE-T interface and powers down  
the AUI if valid packets or link pulses are detected  
by the 10BASE-T receiver. If valid packets and  
link pulses are not detected, the CS8900A selects  
CIRRUS LOGIC PRODUCT DATA SHEET  
DS271PP3  
35  
 
 
 
 
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