Texas Instruments TMS320C674X - Manual (Page 35)

Clock and
reset logic
Receive
DMA engine
Interrupt
controller
Transmit
DMA engine
Control
registers
Configuration bus
EMAC
control
module
Configuration bus
RAM
State
FIFO
Receive
FIFO
Transmit MAC
transmitter
Statistics
receiver
MAC
SYNC
MII
address
Receive
RMII
www.ti.com Architecture
2.8 EMAC Module
This section discusses the architecture and basic function of the EMAC module.
2.8.1 EMAC Module Components
The EMAC module ( Figure 11 ) interfaces to the outside world through the Media Independent Interface
(MII) and/or Reduced Media Independent Interface (RMII). The interface between the EMAC module and
the system core is provided through the EMAC control module. The EMAC consists of the following logical
components:
•
The receive path includes: receive DMA engine, receive FIFO, and MAC receiver
• The transmit path includes: transmit DMA engine, transmit FIFO, and MAC transmitter
• Statistics logic
• State RAM
• Interrupt controller
• Control registers and logic
• Clock and reset logic
Figure 11. EMAC Module Block Diagram
2.8.1.1 Receive DMA Engine
The receive DMA engine is the interface between the receive FIFO and the system core. It interfaces to
the CPU through the bus arbiter in the EMAC control module. This DMA engine is totally independent of
the device DMA.
2.8.1.2 Receive FIFO
The receive FIFO consists of three cells of 64-bytes each and associated control logic. The FIFO buffers
receive data in preparation for writing into packet buffers in device memory.
2.8.1.3 MAC Receiver
The MAC receiver detects and processes incoming network frames, de-frames them, and puts them into
the receive FIFO. The MAC receiver also detects errors and passes statistics to the statistics RAM.
35 SPRUFL5B – April 2011 EMAC/MDIO Module
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