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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  
4.4.19 Register 16: Self Status  
(SelfST, Read-only, Address: PacketPage base + 0136h)  
7
6
5
4
3
2
1
0
INITD  
3.3V Active  
010110  
F
E
D
C
B
A
9
8
EEPROM  
present  
EEsize  
ELPresent  
EEPROM OK  
SIBUSY  
SelfST reports the status of the EEPROM interface and the initialization process.  
010110  
These bits provide an internal address used by the CS8900A to identify this as the Chip Self  
Status Register. When reading this register, these bits will be 010110, where the LSB corre-  
sponds to Bit 0.  
3,3VActive  
If the CS8900A is operating on a 3.3V supply, this bit is set. If the CS8900A is operating on a  
5V supply, this bit is clear.  
INITD  
If set, the CS8900A initialization, including read-in of the EEPROM, is complete.  
SIBUSY  
If set, the EECS output pin is high indicating that the EEPROM is currently being read or pro-  
grammed. The host must not write to PacketPage base + 0040h nor 0042h until SIBUSY is  
clear.  
EEPROMpresent If the EEDataIn pin is low after reset, there is no EEPROM present, and the EEPROMpresent  
bit is clear. If the EEDataIn pin is high after reset, the CS8900A "assumes" that an EEPROM  
is present, and this bit is set.  
EEPROMOK  
ELpresent  
EEsize  
If set, the checksum of the EEPROM readout was OK.  
If set, external logic for Latchable Address bus decode is present.  
This bit shows the size of the attached EEPROM and is valid only if the EEPROMpresent bit  
(Bit 9) and EEPROMOK bit (Bit A) are both set. If clear, the EEPROM size is either 128 words  
(’C56 or ’CS56) or 256 words (C66 or ’CS66). If set, the EEPROM size is 64 words (’C46 or  
’CS46).  
Reset value is: 0000 0000 0001 0110  
CIRRUS LOGIC PRODUCT DATA SHEET  
66  
DS271PP3  
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