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DP83902AVF 데이터시트(PDF) 48 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 DP83902AVF
상세설명  ST-NICTM Serial Network Interface Controller for Twisted Pair
PDF  70 Pages
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83902AVF 데이터시트(HTML) 48 Page - National Semiconductor (TI)

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130 Bus Arbitration and Timing (Continued)
An additional caution for high speed systems is that the
polling must follow guidelines specified in the Time Between
Chip Selects section That is there must be at least 4 bus
clocks between chip selects (For example when BSCK e
20 MHz then this time should be 200 ns)
The general flow for executing a Remote Write is
1 Set Remote Byte Count to a value l1 and Remote Start
Address to unused RAM (one location before the trans-
mit start address is usually a safe location)
2 Issue the ‘‘dummy’’ Remote Read command
3 Read the Current Remote DMA Address (CRDA) (both
bytes)
4 Compare to previous CRDA value if different go to 6
5 Delay and jump to 3
6 Set up for the Remote Write command by setting the
Remote Byte Count and the Remote Start Address (note
that if the Remote Byte count in step 1 can be set to the
transmit byte count plus one and the Remote Start Ad-
dress to one less these will now be incremented to the
correct values)
7 Issue the Remote Write command
TLF11157 – 62
Note
The dashed lines indicate incorrect timing as described in text
Timing Diagram for Dummy Remote Read
48



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