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DP83815 View Datasheet(PDF) - National ->Texas Instruments

Part NameDescriptionManufacturer
DP83815 10/100 Mb/s Integrated PCI Ethernet Media Access Controller and Physical Layer (MacPhyter™) National-Semiconductor
National ->Texas Instruments National-Semiconductor
DP83815 Datasheet PDF : 108 Pages
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3.0 Functional Description (Continued)
3.3.2 Boot PROM
The BIOS ROM interface allows the DP83815 to read from
and write data to an external ROM/Flash device.
3.3.3 EEPROM
60b 4b 6B 6B 2B 46B-1500B 4B
Note: B = Bytes
b = bits
Figure 3-3 Ethernet Packet Format
3.2.4 MIB
The MIB block contains counters to track certain media
events required by the management specifications RFC
1213 (MIB II), RFC 1398 (Ether-like MIB), and IEEE 802.3
LME. The counters provided are for events which are either
difficult or impossible to be intercepted directly by software.
Not all counters are implemented, however required
counters can be calculated from the counters provided.
3.3 Interface Definitions
3.3.1 PCI System Bus
This interface allows direct connection of the DP83815 to a
33 MHz PCI system bus. The DP83815 supports zero wait
state data transfers with burst sizes up to 128 dwords. The
DP83815 conforms to 3.3V AC/DC specifications, but has
5V tolerant inputs.
The DP83815 supports the attachment of an external
EEPROM. The EEPROM interface provides the ability for
the DP83815 to read from and write data to an external
serial EEPROM device. The DP83815 will auto-load values
from the EEPROM to certain fields in PCI configuration
space and operational space and perform a checksum to
verify that the data is valid. Values in the external EEPROM
allow default fields in PCI configuration space and I/O
space to be overridden following a hardware reset. If the
EEPROM is not present, the DP83815 initialization uses
default values for the appropriate Configuration and
Operational Registers. Software can read and write to the
EEPROM using “bit-bang” accesses via the EEPROM
Access Register (MEAR).
3.3.4 Clock
The clock interface provides the 25 MHz clock reference
input for the DP83815 IC. The X1 and X2 pin capacitances
are 4.5 + 1.0pF. The X1 input signal amplitude should be
approximately 1V. This interface supports operation from a
25 MHz, 50 ppm CMOS oscillator, or a 25 MHz, 50 ppm,
parallel, 20 pF load, < 40 ESR crystal resonator. A 20pF
crystal resonator would require C1 and C2 load capacitors
of 27-33pF each.
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