DP83934CVUL20 National Semiconductor, DP83934CVUL20 Datasheet - Page 72

• Manufacturer Part Number: DP83934CVUL20
• Manufacturer: National Semiconductor

Specifications of DP83934CVUL20

• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.75V
• Operating Supply Voltage (max): 5.25V
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 160
• Lead Free Status / RoHS Status: Not Compliant

7 0 Bus Interface
13 PCOMP will not be asserted (DCR2)
14 Packets will be accepted (not rejected) on CAM match
A software reset immediately terminates DMA operations
and future interrupts The chip is put into an idle state where
registers can be accessed but the SONIC-T will not be ac-
tive in any other way The registers are affected by a soft-
ware reset as shown in Table 7-3 (only the Command Reg-
ister is changed)
8 0 Network Interfacing
The SONIC-T contains an on-chip ENDEC that performs the
network interfacing between the AUI (Attachment Unit Inter-
(DCR2)
(Continued)
FIGURE 8-1 MAC and Internal ENDEC Interface Signals
72
face) and the SONIC-T’s MAC unit A pin selectable option
allows the internal ENDEC to be disabled and the
MAC ENDEC signals to be supplied to the user for connec-
tion to an external ENDEC If the EXT pin is tied to ground
(EXT
to V
Internal ENDEC
(EXT
MAC unit are internally connected While these signals are
used internally by the SONIC-T they are also provided as an
output to the user (Figure 8-1)
The internal ENDEC allows for a 2-chip solution for the
complete Ethernet interface Figure 8-2 shows a typical dia-
gram of the Thin Ethernet and AUI network interface
CC
e
e
0) the internal ENDEC is selected and if EXT is tied
0) the interface signals between the ENDEC and
(EXT
e
1) the external ENDEC option is selected
When the internal ENDEC is used
TL F 11719 – 51