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LAN9500AI 데이터시트(PDF) 87 Page - Microchip Technology

부품명 LAN9500AI
상세설명  LAN950x USB 2.0 to 10/100 Ethernet Controller
PDF  213 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN9500AI 데이터시트(HTML) 87 Page - Microchip Technology

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 2010 - 2015 Microchip Technology Inc.
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)
register. If the first byte read from the EEPROM is not 0xA5, it is assumed that the EEPROM is not present, or not pro-
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
Register (E2P_DATA)," on page 139 for a detailed description of these registers. Supported EEPROM operations are
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
10
ERAL
10
EWDS
10
EWEN
10
READ
18
WRITE
18
WRAL
18
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.
0
EECLK
EEDIO (INPUT)
EEDIO (OUTPUT)
EECS
1
D7
D0
0
01
tCSL



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