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LAN9117 데이터시트(PDF) 77 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]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN9117 데이터시트(HTML) 77 Page - Microchip Technology

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 2005-2016 Microchip Technology Inc.
DS00002267A-page 77
LAN9117
5.3.23
E2P_CMD – EEPROM COMMAND REGISTER
This register is used to control the read and write operations with the Serial EEPROM.
TABLE 5-5:
BACKPRESSURE DURATION BIT MAPPING
Backpressure Duration
[19:16]
100Mbs Mode
10Mbs Mode
0h
5uS
7.2uS
1h
10uS
12.2uS
2h
15uS
17.2uS
3h
25uS
27.2uS
4h
50uS
52.2uS
5h
100uS
102.2uS
6h
150uS
152.2uS
7h
200uS
202.2uS
8h
250uS
252.2uS
9h
300uS
302.2uS
Ah
350uS
352.2uS
Bh
400uS
402.2uS
Ch
450uS
452.2uS
Dh
500uS
502.2uS
Eh
550uS
552.2uS
Fh
600uS
602.2uS
Offset:
B0h
Size:
32 bits
Bits
Description
Type
Default
31
EPC Busy: When a 1 is written into this bit, the operation specified in the
EPC command field is performed at the specified EEPROM address. This
bit will remain set until the operation is complete. In the case of a read this
means that the host can read valid data from the E2P data register. The
E2P_CMD and E2P_DATA registers should not be modified until this bit is
cleared. In the case where a write is attempted and an EEPROM is not
present, the EPC Busy remains busy until the EPC Time-out occurs. At that
time the busy bit is cleared.
Note:
EPC busy will be high immediately following power-up or reset.
After the EEPROM controller has finished reading (or attempting
to read) the MAC address from the EEPROM the EPC Busy bit is
cleared.
SC
0


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