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): 65/144頁
文件大小: 1229K
代理商: CDK8920A
Register 16: Self Status (SelfST, Read-only)
Address: PacketPage base + 0136h
F
E
D
C
B
A
9
8
7
6
5-0
EEsize
EEPROM
OK
EEPROM
present
SIBUSY
INITD
PnP
Disable
010110
SelfST reports the status of the EEPROM interface and the initialization process.
BIT
NAME
DESCRIPTION
5-0
010110
These bits provide an internal address used by the CS8920A to identify this as the
Chip Self Status Register. When reading this register, these bits will be 010110, where
the LSB corresponds to Bit 0.
6
PnP Disable
Indicates that the PnP section has been disabled by a bit in the EEPROM. This
disabling feature may be needed if the CS8920A is to look like a legacy device.
7
INITD
When set, the CS8920A initialization, including read-in of the EEPROM, is complete.
8
SIBUSY
When set, the EECS output pin is high indicating that the EEPROM is currently being
read or programmed. The host must not write to PacketPage base + 0040h nor 0042h
until SIBUSY is clear.
9
EEPROM
present
When the EEDI pin is low after reset, there is no EEPROM present, and the
EEPROMpresent bit is clear. If the EEDI pin is high after reset, the CS8920A
"assumes" that an EEPROM is present, and this bit is set.
A
EEPROMOK
When set, the checksum of the EEPROM readout was OK.
C
EEsize
This bit shows the size of the attached EEPROM and is valid only if the
EEPROMpresent bit (Bit 9) andEEPROMOK 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).
This register’s initial state after reset is: (X = Depends on Configuration.)
000X XXXX
XX01 0110
CS8920A
DS238PP2
65
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