mpc8640 Freescale Semiconductor, Inc, mpc8640 Datasheet - Page 38

• Manufacturer Part Number: mpc8640
• Description: Integrated Host Processor
• Manufacturer: Freescale Semiconductor, Inc

Ethernet: Enhanced Three-Speed Ethernet (eTSEC), MII Management
Figure 19
8.2.7
This section describes the RMII transmit and receive AC timing specifications.
8.2.7.1
The RMII transmit AC timing specifications are in
At recommended operating conditions with L/TV
38
REF_CLK clock period
REF_CLK duty cycle
REF_CLK peak-to-peak jitter
Rise time REF_CLK (20%–80%)
Fall time REF_CLK (80%–20%)
(At Transmitter)
shows the RGMII and RTBI AC timing and multiplexing diagrams.
RXD[8:5][3:0]
RXD[7:4][3:0]
TXD[8:5][3:0]
TXD[7:4][3:0]
RMII AC Timing Specifications
RMII Transmit AC Timing Specifications
GTX_CLK
MPC8640 and MPC8640D Integrated Host Processor Hardware Specifications, Rev. 3
(At PHY)
(At PHY)
RX_CTL
RX_CLK
TX_CLK
TX_CTL
Figure 19. RGMII and RTBI AC Timing and Multiplexing Diagrams
Parameter
Table 36. RMII Transmit AC Timing Specifications
RXD[3:0]
TXD[3:0]
DD
RXD[4]
TXD[4]
TXEN
RXDV
of 3.3 V ± 5%.
RXD[8:5]
RXD[7:4]
TXD[8:5]
TXD[7:4]
RXERR
TXERR
RXD[9]
TXD[9]
Table
t
Symbol
RMTH
t
t
t
t
RMTR
RMTF
RMTJ
RMT
36.
/t
RMT
t
t
1
SKRGT
SKRGT
t
RGTH
Min
1.0
1.0
—
35
—
t
RGT
20.0
Typ
50
—
—
—
Freescale Semiconductor
t
t
SKRGT
SKRGT
Max
250
2.0
2.0
65
—
Unit
ns
ps
ns
ns
%