dp83820 National Semiconductor Corporation, dp83820 Datasheet - Page 9

• Manufacturer Part Number: dp83820
• Description: 10/100/1000 Mb/s Pci Ethernet Network Interface Controller
• Manufacturer: National Semiconductor Corporation

3.0 Functional Description
DP83820 consists of a PCI bus interface, BIOS ROM and
EEPROM interfaces, Receive and Transmit Data Buffer
3.1 DP83820
The DP83820 device is an enhanced version of the NSC
MacPhyter
Interface Unit) which has been modified for 1000 Mb/s
operation with additional buffering, higher bandwidth PCI
bus implementation, and the Gigabit Media Independent
Interface for 1000BASE-T phy support. The DP83820
supports an external 10/100/1000 physical layer device.
DP83820 contains the following major design elements:
— a PCI bus interface,
— an EEPROM interface, for access to an NMC93C06
EEPROM,
64
MAC/BIU
Interface
PCI Bus
EEPROM
93C06
Serial
(Media
32
64
32
32
32
64
Access
Figure 3-1
15
Boot ROM/
Flash
Controller/Bus
DP83820
Rx Filter
SRAM
Rx Buffer Manager
Tx Buffer Manager
MIB
Data FIFO
Data FIFO
Functional Block Diagram
9
Managers, an 802.3 Media Access Controller (MAC),
SRAM, and miscellaneous support logic.
— a buffer management scheme that is simple, efficient
— separate receive and transmit FIFOs and DMA
— a 10/100/1000 Mb/s Ethernet Media Access Control
— a Physical Layer Interface (MII/GMII/TBI),
— Management
— Receive Packet filtering logic.
This following section provides a functional overview of
interfaces of the DP83820.
and flexible,
controllers,
(MAC),
Registers,
64
64
64
Information
Rx MAC
Tx MAC
DP83820
Base
(MIB)
8
8
MII
MGMT
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