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AM79C901AVCT датащи(PDF) 25 Page - Advanced Micro Devices

номер детали AM79C901AVCT
подробное описание детали  HomePHY Single-Chip 1/10 Mbps Home Networking PHY
PDF  90 Pages
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производитель  AMD [Advanced Micro Devices]
домашняя страница  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C901AVCT датащи(HTML) 25 Page - Advanced Micro Devices

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Am79C901A
25
PR ELI M IN AR Y
Figure 6.
TXPKT - TXEN Cleared
Figure 7.
TXPKT - CLS Asserted
TXCLK
TXEN
TXDAT
RXCLK
RXCRS
RXDAT
CLS
22304B-8
Note: Once TXEN is cleared, the last symbol gets encoded and transmitted, the looped-back data is presented
back to the MAC, and RXCRS falls. Once RXCRS falls, TXCLK and RXCLK toggle for 96 clocks, after which
the system returns to the Idle state.
TXCLK
TXEN
TXDAT
RXCLK
RXCRS
RXDAT
CLS
Note: CLS will be asserted some time after the preamble and SFD have been clocked in. TXCLK and RXCLK
are then clocked until RXCRS drops. TXEN drops about 32 clocks after CLS was asserted. RXCRS and CLS
are dropped together after more than 500 clocks (about 120
µs). TXCLK and RXCLK keep toggling for approx-
imately another 100 clock cycles, when the system returns to the Idle state.
22304B-9



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