cx82100 Conexant Systems, Inc., cx82100 Datasheet - Page 104

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cx82100

Manufacturer Part Number
cx82100
Description
Home Network Processor Hnp
Manufacturer
Conexant Systems, Inc.
Datasheet

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7.4
Figure 7-3. EMAC Functional Block Diagram
7-6
HNP
APB
EMAC Architecture
Conexant Proprietary and Confidential Information
Block diagram of the EMAC unit is shown in Figure 7-3.
The EMAC module interfaces with the DMA controller through the DMA interface
block. The APB address is decoded in this block. Tx Buffer Manager (TBM) and Rx
Buffer Manager (RBM) blocks control the MAC Transmitter and MAC Receiver,
respectively. TBM and RBM issue the requests to the DMA controller and control their
own FIFOs.
Synchronization is required between the MAC receiver and the RBM because they
operate on different clocks (PCLK and EMx_RX_CLK, respectively). Similarly,
synchronization is required between the MAC transmitter and the TBM because they
operate on different clocks (PCLK and EMx_TX_CLK, respectively).
Interface
DMA
CX82100 Home Network Processor Data Sheet
Rx Buffer Manager
Tx Buffer Manager
RXFIFO
TXFIFO
(TBM)
(RBM)
TM AC
RM AC
SYNC
SYNC
Transm itter
Receiver
ERXCK
ETXCK
MAC
MAC
ERXD[3:0]
ETXD[3:0]
101545_030
101306C

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