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LAN9117 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 78 Page - Microchip Technology

๋ถ€ํ’ˆ๋ช… LAN9117
์ƒ์„ธ๋‚ด์šฉ  High Performance Single-Chip 10/100 Non-PCI Ethernet Controller
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์ œ์กฐ์‚ฌ  MICROCHIP [Microchip Technology]
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LAN9117 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 78 Page - Microchip Technology

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LAN9117
DS00002267A-page 78
๏ƒฃ 2005-2016 Microchip Technology Inc.
30-28
EPC command. This field is used to issue commands to the EEPROM
controller. The EPC will execute commands when the EPC Busy bit is set.
A new command must not be issued until the previous command completes.
This field is encoded as follows:
READ (Read Location): This command will cause a read of the EEPROM
location pointed to by EPC Address. The result of the read is available in the
E2P_DATA register.
EWDS (Erase/Write Disable): After issued, the EEPROM will ignore erase
and write commands. To re-enable erase/write operations issue the EWEN
command.
EWEN (Erase/Write Enable): Enables the EEPROM for erase and write
operations. The EEPROM will allow erase and write operations until the
Erase/Write Disable command is sent, or until power is cycled.
Note:
The EEPROM device will power-up in the erase/write-disabled
state. Any erase or write operations will fail until an Erase/Write
Enable command is issued.
WRITE (Write Location): If erase/write operations are enabled in the
EEPROM, this command will cause the contents of the E2P_DATA register
to be written to the EEPROM location selected by the EPC Address field.
WRAL (Write All): If erase/write operations are enabled in the EEPROM,
this command will cause the contents of the E2P_DATA register to be written
to every EEPROM memory location.
ERASE (Erase Location): If erase/write operations are enabled in the
EEPROM, this command will erase the location selected by the EPC
Address field.
ERAL (Erase All): If erase/write operations are enabled in the EEPROM,
this command will initiate a bulk erase of the entire EEPROM.
RELOAD (MAC Address Reload): Instructs the EEPROM controller to
reload the MAC address from the EEPROM. If a value of 0xA5 is not found
in the first address of the EEPROM, the EEPROM is assumed to be un-
programmed and MAC Address Reload operation will fail. The โ€œMAC
Address Loadedโ€ bit indicates a successful load of the MAC address.
R/W
0
27-10
Reserved.
RO
-
Bits
Description
Type
Default
[30]
[29]
[28]
OPERATION
0
0
0
READ
001
EWDS
0
1
0
EWEN
011
WRITE
100
WRAL
1
0
1
ERASE
1
1
0
ERAL
111
Reload


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