LAN9500AI datasheet(87/213 Pages) MICROCHIP

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DS00001875A-page 87

LAN950x

Table 5-61, "Required EECLK Cycles", shown below, shows the number of EECLK cycles required for each EEPROM

operation.

5.7.4.2

Host Initiated EEPROM Reload

The Host can initiate a reload of the EEPROM by issuing the RELOAD command via the E2P Command (E2P_CMD)

grammed, and the reload will fail. The Data Loaded bit of the E2P_CMD register indicates a successful reload of the

EEPROM.

5.7.4.3

EEPROM Command and Data Registers

Refer to Section 7.3.12, "EEPROM Command Register (E2P_CMD)," on page 136 and Section 7.3.13, "EEPROM Data

described in these sections.

5.7.4.4

EEPROM Timing

Refer to Section 8.5.4, "EEPROM Timing," on page 198 for detailed EEPROM timing specifications.

FIGURE 5-27:

EEPROM WRAL CYCLE

TABLE 5-61:

REQUIRED EECLK CYCLES

Operation

Required EECLK Cycles

ERASE

ERAL

EWDS

EWEN

READ

WRITE

WRAL

Note:

It is not recommended that the RELOAD command be used as part of normal operation, as race conditions

can occur with USB Commands that access descriptor data. It is best for the Host to issue a SRST to reload

the EEPROM data.

EECLK

EEDIO (INPUT)

EEDIO (OUTPUT)

EECS

tCSL

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