參數(shù)資料
型號: CDK8920A
廠商: Cirrus Logic, Inc.
英文描述: CRYSTAL LAN ISA PLUG-AND-PLAY ETHERNET CONTROLLER
中文描述: 水晶藍(lán)的ISA即插即用,即插即用以太網(wǎng)控制器
文件頁數(shù): 76/144頁
文件大?。?/td> 1229K
代理商: CDK8920A
Boot PROM Base Address (Read/Write)
Address: PacketPage base + 0340h
Address 0341h
Boot PROM base address, low byte.
Address 0340h
Boot PROM base address, high byte.
After reset, if no EEPROM is found by the CS8920A, the register has the following initial state. If an EEPROM is
found, the register’s initial value may be set by the EEPROM. See Section 3.3.
0000 0000
0000 0000
Boot PROM Address Mask (Read/Write)
Address: PacketPage base + 0343h
Address 0344h
Boot PROM mask address, low byte.
Address 0343h
Boot PROM mask address, high byte.
The Boot PROM address mask register indicates the size of the attached Boot PROM. The bits in this register
select which address lines are used for address matching. If a bit is set, the corresponding address line is used
in address matching for the Boot PROM address. The high byte (PacketPage base + 0343h) corresponds to
address lines A[23:16] and the low byte corresponds to address line A[15:8]
For example:
Size of Boot PROM
4k bits
8k bits
16k 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
After reset, if no EEPROM is found by the CS8920A, the register has the following initial state. If an EEPROM is
found, the register’s initial value may be set by the EEPROM. See Section 3.3.
0000 0000
0000 0000
CS8920A
76
DS238PP2
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