UM0851 datasheet(44/245 Pages) STMICROELECTRONICS

tên linh kiện	UM0851

Giải thích chi tiết về linh kiện	SPEAr is a family of highly customizable ARM-based embedded

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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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