EZ80F91MCU ZILOG [Zilog, Inc.], EZ80F91MCU Datasheet - Page 259

• Manufacturer Part Number: EZ80F91MCU
• Description: eZ80Acclaim-TM Flash Microcontrollers
• Manufacturer: ZILOG [Zilog, Inc.]

Ethernet Media Access Controller
Figure 47. EMAC Block Diagram
PS019209-0504
MII Interface
RxCLK
TxCLK
The Ethernet Media Access Controller (EMAC) is a full-function 10/100 Mbps
media access control module with a Media-Independent Interface (MII). This
EMAC and interface combination is called a EMACMII module. Figure 47 pre-
sents an illustration of the EMAC block.
The EMACMII module consists of six submodules that represent the Transmit and
Receive portions of the Ethernet MAC, plus the EMAC sublayer module. In addi-
tion, there is a host interface module, a central clock and reset module, and an MII
management module. There are many different applications possible, including
network interface designs, Ethernet switching designs, and test equipment
designs.
The EMAC functions are contained in the Transmit and Receive modules. These
modules represent the core MAC. 802.3x flow control implemented by the EMAC
sublayer module.
The MII management module provides a two-wire control/status path to the MII
PHY. Read and Write communication to and from registers within the PHY is
accomplished via the host interface.
MDIO
RxDV
RxER
TxER
TxEN
MDC
CRS
COL
RxD
TxD
RxD/CTRL
Accept
Reject
P R E L I M I N A R Y
RxFIFO
TxFIFO
CTRL
RxD
RxDMA
TxDMA
Ethernet Media Access Controller
Product Specification
eZ80F91 MCU
240