13 / 61 page
DM9801
1M Home Phoneline Network Physical Layer Single Chip Transceiver
Preliminary
13
Version: DM9801-DS-P02
March 20, 2000
MII Interface Transmit and Receive Timing Diagram (continued)
TX_CLK
RX_CLK
TX_EN
TXD
CRS
RXD
COL
RX_DV
0
5 (Preamble)
D
0
DATA
Once TX_EN is asserted, DM9801 stops RX_CLK, asserts CRS, and toggles TX_CLK at 933.3 ns.
TXPKT – TX_EN Asserted
Figure 5
TX_CLK
RX_CLK
TX_EN
TXD
CRS
RXD
COL
RX_DV
D
DATA
5 (Preamble)
0
DATA
5
D
TX_CLK continues to toggle at 933.3 ns until the SFD is observed, as shown in the first section of the above diagram. At this
point, TX_CLK is disabled (high) until AID header has been transmitted on the wire (or until a COL has been detected). This
takes about 120 us, at which time RX_CLK starts toggling, thereby shifting 32 bits of preamble and SFD back to the MAC.
Sometime later, the TX_CLK restarts as symbols get sent onto the wire in an analogous manner as RX_CLK during packet
reception.
TXPKT – RX_CLK Active
Figure 6
New Zealand ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
