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UM0851 Datasheet(PDF) 44 Page - STMicroelectronics

Part # UM0851
Description  SPEAr is a family of highly customizable ARM-based embedded
PDF  245 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0851 Datasheet(HTML) 44 Page - STMicroelectronics

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Communication device drivers
UM0851
44/245
Doc ID 16604 Rev 2
Figure 7.
GMAC block diagram
The GMAC-UNIV supports any one or a combination of the following PHY interfaces:
●
Gigabit media independent interface (GMII)/media independent interface (MII) [default]
●
Serial GMII (SGMII)
Apart from the above, the following hardware features are available and supported by the
software:
●
Promiscuous mode
●
Check Sum offload for received IP and TCP/UDP packets
●
Dual buffer ring (implicit chaining) being used for handling DMA descriptors. This option
allows a maximum of 4 KB of packets to be handled by a single DMA descriptor for
SPEAr600 and 16 KB of packets handled by a single DMA descriptor for SPEAr300
●
Magic packet detection support for waking up from sleep.
4.1.2
Software overview
The GMAC Ethernet driver sits on top of the GMAC controller and interfaces with the Linux
TCP/IP stack through the standard Linux network interface.
RX FIFO
MEM
TX FIFO
MEM
TX FC
RX FC
DMA
CSR
OMR
REGS
MAC
CSR
DMA
AHB
MASTER
I/F
AHB
SLAVE
I/F
PHY
I/F
SGMII
MUX
(G)MII
GMAC MTL
GMAC DMA
GMAC AHB



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