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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  
4.3.9 Boot PROM Base Address  
(Read/Write, Address: PacketPage base + 0030h)  
Address 0033h  
Address 0032h  
Address 0031h  
Address 0030h  
The most significant nibble of  
Boot PROM base address. Contains portion of Boot PROM  
The least significant byte of  
the Boot PROM base  
address.  
Reserved  
The high-order nibble is  
reserved.  
base address.  
The lower three bytes (0030h, 0031h, and 0032h) of the Boot PROM Base Address register are used for the 20-bit  
Boot PROM base address. The upper three nibbles are reserved. See Section 3.6 on page 25.  
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 3.3 on page 19.  
Reset value is: XXXX XXXX XXXX 0000 0000 0000 0000 0000  
4.3.10 Boot PROM Address Mask  
(Read/Write, Address: PacketPage base + 0034h)  
Address 0037h  
Address 0036h  
The most significant nibble of  
Boot PROM mask address.  
The high-order nibble is  
reserved.  
Address 0035h  
Address 0034h  
The least significant byte of  
the Boot PROM mask  
address. Must be written as  
00h.  
Contains portion of Boot PROM  
mask address. The lower-order  
nibble must be written as 0h.  
Reserved  
The Boot PROM address mask register indicates the size of the attached Boot PROM and is limited to 4K bit incre-  
ments. The lower 12 bits of the Address Mask are ignored, and should be 000h. The next lowest-order bits describe  
the size of the PROM. The upper three nibbles are reserved.  
For example:  
Size of Boot PROM  
4k bits  
Register value  
XXXX XXXX XXXX 1111 1111 0000 0000 0000  
XXXX XXXX XXXX 1111 1110 0000 0000 0000  
XXXX XXXX XXXX 1111 1100 0000 0000 0000  
8k bits  
16k bits  
See Section 3.6 on page 25.  
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 3.3 on page 19.  
Reset value is: XXXX XXXX XXXX 0000 0000 0000 0000 0000  
CIRRUS LOGIC PRODUCT DATA SHEET  
DS271PP3  
45  
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