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： 水晶藍的ISA即插即用，即插即用以太網(wǎng)控制器
文件頁數(shù)： 23/144頁
文件大?。?/td> 1229K
代理商： CDK8920A
EEPROM. If configuration data are not stored in
the EEPROM, the CS8920A terminates initiali-
zation from EEPROM and operates using its
default configuration (See Table 3.3). Note: the
default configuration leaves the CS8920A in a
PnP inactive state; it can then only be accessed
through the PnP configuration and data ports. If
configuration data are stored in EEPROM, the
CS8920A automatically loads all configuration
data stored in the Reset Configuration Block into
its internal PacketPage registers.
EEPROM Readout Completion
Once all the configuration data are transferred to
the appropriate PacketPage registers, the
CS8920A adds the sum of the data bytes it read
to the 2’s complement checksum at the end of
the configuration data to verify the Reset Con-
figuration Block’s data are valid. If the resulting
total is 0, the readout is considered valid. Other-
wise, the CS8920A initiates a partial reset to
restore the default configuration.
If the readout is valid, the EEPROMOK bit
(Register 16, SelfST, bit A) is set. EEPROMOK
is cleared if a checksum error is detected. In this
case, the CS8920A performs a partial reset and
is restored to its default. Once initialization is
complete (configuration loaded from EEPROM
or reset to default configuration) the INITD bit is
set (Register 16, SelfST, bit 7).
3.6
Programming the EEPROM
After initialization, the host can access the
EEPROM through the CS8920A by writing one
of seven commands to the EEPROM Command
register (PacketPage base + 0040h). Figure 3.2
shows the format of the EEPROM Command
register.
EEPROM Commands
The seven commands used to access the
EEPROM are: Read, Write, Erase, Erase/Write
Enable, Erase/Write Disable, Erase-All, and
Write-All. They are described in Table 3.7.
EEPROM Command Execution
During the execution of a command, the two Op-
code bits, followed by six bits of address (for a
’C46 or ’CS46) or eighth bits of address (for a
’C56, ’CS56, ’C66 or ’CS66), are shifted out of
the CS8920A, into the EEPROM. If the com-
mand is a Write, the data in the EEPROM Data
register (PacketPage base + 0042h) follows. If
Command
Opcode
(bits 9,8)
1,0
0,1
1,1
0,0
EEPROM Address
(bits 7 to 0)
word address
word address
word address
XX11-XXXX
11XX-XXXX
XX00-XXXX
00XX-XXXX
XX10-XXXX
10XX-XXXX
XX01-XXXX
01XX-XXXX
Data
EEPROM Type
Execution Time
Read Register
Write Register
Erase Register
Erase/Write Enable
yes
yes
no
no
no
no
no
no
no
yes
yes
all
all
all
’CS46, ’C46
’CS56, ’C56, ’CS66, ’C66
’CS46, ’C46
’CS56, ’C56, ’CS66, ’C66
’CS46, ’C46
’CS56, ’C56, ’CS66, ’C66
’CS46, ’C46
’CS56, ’C56, ’CS66, ’C66
25
μ
s
10 ms
10 ms
9
μ
s
9
μ
s
9
μ
s
9
μ
s
10 ms
10 ms
10 ms
10 ms
Erase/Write Disable
0,0
0,0
Erase-All Registers
0,0
0,0
0,0
0,0
Write-All Registers
Table 3.7. EEPROM Commands
CS8920A
DS238PP2
23
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