CN7221 Datasheet, PDF (8/18 Pages) Conexant Systems, Inc – Home Networking Physical Layer Device with Integrated Analog Front End Circuitry

LANfinity™ CN7221
TxPKT  HLAN_COL Asserted
HLAN_TX_CLK
HLAN_TX_EN
HLAN_TXD
Home Networking PHY with Integrated AFE
HLAN_RX_CLK
HLAN_CRS
HLAN_RXD
HLAN_COL
HLAN_COL will be asserted some time after the preamble and SFD have been clocked in. HLAN_TX_CLK and HLAN_RX_CLK
are then clocked with a period of 233.3ns until HLAN_CRS drops. HLAN_TX_EN drops about 32 clocks after HLAN_COL was
asserted. HLAN_CRS and HLAN_COL are dropped together after more than 500 clocks (about 120us). HLAN_TX_CLK and
HLAN_RX_CLK keep toggling at 233.3ns period for roughly another 100 clock cycles, when the system returns to the idle state.
RxPKT  HLAN_COL Asserted
HLAN_TX_CLK
HLAN_TX_EN
HLAN_TXD
HLAN_RX_CLK
HLAN_CRS
HLAN_RXD
HLAN_COL
HLAN_COL may be asserted up to 120us after HLAN_CRS has been asserted. Once HLAN_COL has been asserted,
HLAN_TX_CLK and HLAN_RX_CLK run at a period of 233.3ns per cycle until 97 cycles after HLAN_COL and HLAN_CRS are
cleared. It can take up to about 60us for HLAN_CRS to clear.
8
Conexant
LAN-056, Rev. A
PROPRIETARY INFORMATION