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參數資料
型號: W3100A
廠商: Electronic Theatre Controls, Inc.
英文描述: i2Chip W3100A
中文描述: i2Chip W3100A
文件頁數: 49/63頁
文件大小: 557K
代理商: W3100A
5.2.2 nibble MII
This mode is the I/F for 10/100Mbps Physical Layer Devices, and is composed of 4-bit TXD[0:3] and
RXD[0:3]. TX_CLK and RX_CLK use a 2.5MHz cycle at 10Mbps and 25MHz at 100Mbps.
When linking the W3100A with the Physical Layer Device in this mode, RXD[0:3] and TXD[0:3] of the
Physical Layer Device must be connected to RXD[0:3] and TXD[0:3] of the W3100A.
The W3100A supports both the serial mode and the nibble mode.
5.2.3 MII Frame Format
TXEN = 0
TXEN = 1
TXEN = 0
IDLE
PREAMBLE
Start
of Frame
Delimiter
DATA Nibbles
IDLE
PREAMBLE
SFD
DATA1
DATA2
DATA N-1
DATA N
62B
2B
PREAMBLE
1 0 1 0 … … 62 bits long
SFD
1 1
DATA
Between 64 – 1518 data bytes
IDLE
TXEN = 0
5.3.4 Nibble MII Order
MAC’s SERIAL BIT STREAM
LSB
D0
D1
D2
D3
D4
D5
D6
D7
MSB
FIRST NIBBLE
SECOND
NIBBLE
TXD0/RXD0
TXD1/RXD1
TXD2/RXD2
TXD3/RXD3
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