am79c940 Advanced Micro Devices, am79c940 Datasheet - Page 82

• Manufacturer Part Number: am79c940
• Description: Media Access Controller For Ethernet Mace
• Manufacturer: Advanced Micro Devices

NETWORK INTERFACES
External Address Detection Interface
(EADI)
The External Address Detection Interface can be used
to implement alternative address recognition schemes
outside the MACE device, to complement the physical,
logical and promiscuous detection supported internally.
82
AMD
SRDCLK
EAM/R
SF/BD
EADI
SRD
Pins
Block
Logic
EADI Feature – Simple External CAM Interface
SER
SRCK
RCK
Q H’
SER
SRCK
RCK
Q H’
74LS595
74LS595
Q
Q
H–A
H–A
MTCH
Am79C940
Am99C10
D15–D0
The address matching, and the support logic necessary
to capture and present the relevant data to the external
table of address is application specific. Note that since
the entire 802.3 packet after SFD is made available, rec-
ognition is not limited to the destination address and/or
type fields (Ethernet only). Inter-networking protocol
recognition can be performed on specific header or LLC
information fields.
B8–B1
B8–B1
74LS245
74LS245
A8–A1
A8–A1
Programming
Interface
CAM
Databus
Databus
16235C-13