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AM79C984 датащи(PDF) 22 Page - Advanced Micro Devices

номер детали AM79C984
подробное описание детали  enhanced Integrated Multiport Repeater (eIMR??
PDF  44 Pages
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производитель  AMD [Advanced Micro Devices]
домашняя страница  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C984 датащи(HTML) 22 Page - Advanced Micro Devices

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P R E L I M I N A R Y
22
Am79C984A
Command/Response Timing
Figure 6 shows the command/response timing. At the
end of a GET command, the eIMR device waits two
SCLK cycles and then transmits the response on SO.
.
Figure 6. Control Get Command/Response
Control Commands
The following section details the operation of each con-
trol commands available in the eIMR device. In all
cases, the individual bits in each command are shown
with the most-significant bit (bit 7) on the left and the
least-significant bit (bit 0) on the right. Table 4 and Table
5 show a summary of default states and a summary of
control commands, respectively.
Note: Data is transmitted and received on the serial
data lines least-significant bit first and most-significant
bit last.
ST D0 D1 D2 D3 D4 D5 D6 D7
SCLK
SI
ST D0 D1 D2 D3 D4 D5 D6 D7
SO
20650A-11
20650B-11
Table 4. Summary of Default States after Reset
eIMR Programmable Option—S Off
AUI Partitioning Algorithm
Normal
TP Partitioning Algorithm
Normal
AUI/TP Port
Enabled
Link Test
Enabled
Link Pulse
Enabled
Automatic Receiver Polarity
Reversal
State of SI at reset
Extended Distance Mode
Disabled
Blink Rate
Off
Software Override of LEDs
Disabled



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