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ADIN2111CCPZ-R7 数据表(PDF) 39 Page - Analog Devices

部件名 ADIN2111CCPZ-R7
功能描述  Low Complexity, 2-Port Ethernet Switch with Integrated 10BASE-T1L PHYs
PDF  125 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADIN2111CCPZ-R7 数据表(HTML) 39 Page - Analog Devices

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Data Sheet
ADIN2111
SWITCH SPI
analog.com
Rev. 0 | 39 of 125
The OPEN Alliance SPI protocol defines two types of transactions:
data transactions for Ethernet frame transfers, and control transac-
tions for register read/write operations.
A chunk is the basic element of data transactions, and it is com-
posed of four bytes of overhead plus the configured payload size.
Data transactions consist of an equal number of transmit and
receive chunks. Chunks in both transmit and receive directions
may or may not contain valid frame data independent from each
other, allowing for the simultaneous transmission and reception of
different length frames. The data header of the chunk in transmit
frames, and the data footer in receive frames, indicate which bytes
of the payload contain valid frame data. For full information on the
OPEN Alliance SPI protocol used by the ADIN2111, refer to OPEN
Alliance 10BASE-T1x MACPHY serial interface Version 1.0.
Note that CS must be deasserted between data transactions and
control transactions, as shown in Figure 23.
CHUNK 1
MULTIPLE CHUNKS WITHIN
SPI DATA TRANSACTION
MCU HW/FW
TURN AROUND
MCU HW/FW
TURN AROUND
SPI CONTROL TRANSACTION
CHUNK 2
---
---
CHUNK x
CONTROL
READ
CONTROL
READ
CHUNK 1
MOSI
SCK
CS
MISO
CHUNK 2
---
---
CHUNK x
CONTROL
READ
CONTROL
READ
OR
OR
Figure 23. Ethernet Data Frame Transfer Followed by Control Transfer



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