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IXF1104 Quad-Port 10/100/1000 Mbps Ethernet Media Access Controller
84 Datasheet
Document Number: 278757
Revision Number: 007
Revision Date: March 25, 2004
5.2.2.1 Transmit Timing
In MPHY mode a packet transmission starts with the TSX signal indicating port address
information is on the data bus. The next clock cycle TENB and TSOP indicate present data on the
bus is the first word in the packet and all subsequent clocks will contain valid data as long as TENB
is active or until TEOP is asserted. Data transmission can be temporally halted when TENB goes
high then resumed when TENB is low. The valid bytes in the final word, during an active TEOP,
are indicated by state of TMOD [1:0].
5.2.2.2 Receive Timing
A packet is received when RSX indicates port address information on the data bus followed by
RSOP to indicate the data bus contains the first word of a packet. All subsequent data is valid only
while RVAL is High and until REOP is asserted. Receive data can be temporarily halted when
RENB is de-asserted and starts again on the second rising edge of RFCLK following the assertion
of RENB. RMOD indicates the number of valid bytes in the last transfer when REOP is asserted.
Figure 11. MPHY Transmit Logical Timing
B3216-01
TFCLK
TENB
TSOP
TEOP
TMOD[1:0]
TERR
TSX
TDAT[31:0]
TPRTY
TPA
0000 B1-B4 B5-B8 B41-B44 B45-B48 B49-B52 B53-B56 B57
B0001
1
1. Applies to all transmit packet available signals (STPA, PTPA, DTPA_0:3).