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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)： | 24/144頁 |
| 文件大?。?/td> | 1229K |
| 代理商： | CDK8920A |
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the command is a Read, the data in the specified
EEPROM location is written into the EEPROM
Data register. If the command is an Erase or
Erase-All, no data is transferred to or from the
EEPROM Data register. Before issuing any com-
mand, the host must wait for the SIBUSY bit
(Register 16, SelfST, bit 8) to clear. After each
command has been issued, the host must wait
again for SI-BUSY to clear.
Enabling Access to the EEPROM
The Erase/Write Enable command provides pro-
tection from accidental writes to the EEPROM.
The host must write an Erase/Write Enable com-
mand before it attempts to write to or erase any
EEPROM memory location. Once the host has
finished altering the contents of the EEPROM, it
must write an Erase/Write Disable command to
prevent unwanted modification of the EEPROM.
Writing and Erasing the EEPROM
To write data to the EEPROM, the host must
execute the following series of commands:
1. Issue an Erase/Write Enable command
.
2. Load the data into the EEPROM Data register.
3. Issue a Write command.
4. Issue an Erase/Write Disable command.
During the Erase command, the CS8920A writes
FFh to the specified EEPROM location. During
the Erase-All command, the CS8920A writes
FFh to all locations.
3.7
Boot PROM Operation
The CS8920A supports an optional Boot PROM
used to store code for remote booting from a
network server. This is typically done for a disk-
less workstation.
Accessing the Boot PROM
The CS8920A provides address decoding cir-
cuitry to generate a chip select for a Boot
PROM. When the address on the ISA bus match
the address loaded into the Boot PROM base ad-
dress register and qualified by Boot PROM
address mask register. The CS8920A generates a
chipselect signal for the Boot PROM.
Configuring the CS8920A for Boot PROM
Operation
Figure 3.3 show how the CS8920A should be
connected to the Boot PROM and ’245 driver.
To configure the CS8920A’s internal registers for
Boot PROM operation, the Boot PROM Base
Address must be loaded into the Boot PROM
Base Address register (PacketPage base + 0340h)
and the Boot PROM Address Mask must be
loaded into the BootPROM Address Mask regis-
ter (PacketPage base + 0343h). The Boot PROM
Base Address provides the starting location in
host memory where the Boot PROM is mapped.
The Boot PROM Address Mask indicates the
size of the attached Boot PROM and is limited
to 4-Kbyte increments. The lower 12 bits of the
Address Mask are ignored and should be 000h.
OE
DIR
B1
.
.
.
B8
A1
.
.
.
A8
74LS245
SD(0:7)
ISA
BUS
SA(0:14)
27C256
CE
OE
20
22
19
CS8920A
CSOUT
(Pin 17)
Figure 3.3. Boot PROM Connection Diagram
CS8920A
24
DS238PP2
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