AM79C901A Datasheet, PDF (23/90 Pages) Advanced Micro Devices – HomePHY Single-Chip 1/10 Mbps Home Networking PHY

TXCLK
TXEN
TXDAT
RXCLK
RXCRS
RXDAT
CLS
PRELIMINARY
Note: RXCLK becomes disabled as soon as RXCRS is asserted.
Figure 2. RXPKT - RXCRS Asserted
22304B-4
TXCLK
TXEN
TXDAT
RXCLK
RXCRS
RXDAT
CLS
22304B-5
Note: RXCLK and TXCLK are unrelated to each other during this time. When a symbol has been received and
decoded, RXCLK toggles in order to shift out the three to six bits encoded in the symbol. The middle portion of
this diagram shows the end of the preamble, followed by an SFD and the beginning of the data. RXCRS will fall
after the last received symbol. Once RXCRS falls, RXCLK and TXCLK are toggled continuously for 96 cycles,
after which the PHY returns to the Idle state.
Figure 3. RXPKT - RXCRS Cleared
Am79C901A
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