DP83934CVUL20 National Semiconductor, DP83934CVUL20 Datasheet - Page 72
DP83934CVUL20
Manufacturer Part Number
DP83934CVUL20
Description
Manufacturer
National Semiconductor
Datasheet
1.DP83934CVUL20.pdf
(104 pages)
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
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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
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