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LAN9117 데이터시트(PDF) 25 Page - Microchip Technology

부품명 LAN9117
부품 상세설명  High Performance Single-Chip 10/100 Non-PCI Ethernet Controller
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제조업체  MICROCHIP [Microchip Technology]
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LAN9117 데이터시트(HTML) 25 Page - Microchip Technology

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DS00002267A-page 25
LAN9117
If an operation is attempted, and an EEPROM device does not respond within 30mS, the LAN9117 will timeout, and the
EPC timeout bit (EPC_TO) in the E2P_CMD register will be set.
Figure 3-3, "EEPROM Access Flow Diagram" illustrates the host accesses required to perform an EEPROM Read or
Write operation.
The host can disable the EEPROM interface through the GPIO_CFG register. When the interface is disabled, the EEDIO
and ECLK signals can be used as general-purpose outputs, or they may be used to monitor internal MII signals.
3.9.2.1
Supported EEPROM Operations
The EEPROM controller supports the following EEPROM operations under host control via the E2P_CMD register. The
operations are commonly supported by “93C46” EEPROM devices. A description and functional timing diagram is pro-
vided below for each operation. Please refer to the E2P_CMD register description in Section 5.3.23, "E2P_CMD –
EEPROM Command Register," on page 77 for E2P_CMD field settings for each command.
Note:
The EEPROM device powers-up in the erase/write disabled state. To modify the contents of the EEPROM
the host must first issue the EWEN command.
FIGURE 3-3:
EEPROM ACCESS FLOW DIAGRAM
Idle
Write Data
Regis ter
Write
Command
Regis ter
Read
Command
Regis ter
Bus y Bit = 0
Idle
Write
Command
Regis ter
Read
Command
Regis ter
Read Data
Regis ter
Busy Bit = 0
EEPRO M W rite
EEPRO M Read


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