3 eral (erase all), Figure 10.8 eeprom eral cycle, 4 ewds (erase/write disable) – SMSC LAN9312 User Manual
Page 146: Figure 10.9 eeprom ewds cycle, Eral (erase all), Ewds (erase/write disable), Datasheet
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High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
Revision 1.4 (08-19-08)
146
SMSC LAN9312
DATASHEET
10.2.3.3
ERAL (Erase All)
If erase/write operations are enabled in the EEPROM, this command will initiate a bulk erase of the
entire EEPROM. The EPC_TIMEOUT bit of the
EEPROM Command Register (E2P_CMD)
is set if the
EEPROM does not respond within 30mS.
10.2.3.4
EWDS (Erase/Write Disable)
After this command is issued, the EEPROM will ignore erase and write commands. To re-enable
erase/write operations, the EWEN command must be issued.
Figure 10.8 EEPROM ERAL Cycle
Figure 10.9 EEPROM EWDS Cycle
0
1
0
1
0
EECLK
EEDI
EEDO
EECS
0
1
0
0
0
EECLK
EEDI
EEDO
EECS
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