mpc8641 Freescale Semiconductor, Inc, mpc8641 Datasheet - Page 39

• Manufacturer Part Number: mpc8641
• Description: Integrated Host Processor Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

8.2.5
When the eTSEC is configured for TBI modes, all clocks are supplied from external sources to the relevant
eTSEC interface. In single-clock TBI mode, when TBICON[CLKSEL] = 1 a 125-MHz TBI receive clock
is supplied on TSECn_RX_CLK pin (no receive clock is used on TSECn_TX_CLK in this mode, whereas
for the dual-clock mode this is the PMA1 receive clock). The 125-MHz transmit clock is applied on the
TSEC_GTX_CLK125 pin in all TBI modes.
A summary of the single-clock TBI mode AC specifications for receive appears in
A timing diagram for TBI receive appears in
8.2.6
Table 35
At recommended operating conditions with L/TV
Freescale Semiconductor
At recommended operating conditions with L/TV
Data to clock output skew (at transmitter)
Data to clock input skew (at receiver)
.
1
RX_CLK clock period
RX_CLK duty cycle
RX_CLK peak-to-peak jitter
Rise time RX_CLK (20%–80%)
Fall time RX_CLK (80%–20%)
RCG[9:0] setup time to RX_CLK rising edge
RCG[9:0] hold time to RX_CLK rising edge
±100 ppm tolerance on RX_CLK frequency
presents the RGMII and RTBI AC timing specifications.
RX_CLK
RCG[9:0]
TBI Single-Clock Mode AC Specifications
RGMII and RTBI AC Timing
Parameter/Condition
MPC8641 and MPC8641D Integrated Host Processor Hardware Specifications, Rev. 2
Parameter/Condition
Table 34. TBI single-clock Mode Receive AC Timing Specification
Figure 18. TBI Single-Clock Mode Receive AC Timing Diagram
t
TRRH
Table 35. RGMII and RTBI AC Timing Specifications
2
DD
DD
t
TRR
of 2.5 V ± 5%.
of 3.3 V ± 5% and 2.5 V ± 5%.
t
TRRDVKH
Figure
valid data
Symbol
t
t
t
SKRGT
Specifications
t
SKRGT
TRRH/
t
Ethernet: Enhanced Three-Speed Ethernet (eTSEC), MII Management
Symbol
TRRDXKH
TRRDVKH
t
t
t
t
t
TRRDXKH
TRRR
18.
TRR
TRRF
TRRJ
t
5
TRR
1
1
Min
7.5
2.0
1.0
40
—
—
—
t
–500
TRRF
Min
1.0
Typ
8.0
50
—
—
—
—
—
Typ
—
0
t
TRRR
Table
Max
250
8.5
1.0
1.0
60
—
—
Max
34.
500
2.8
Unit
ns
ps
ns
ns
ns
ns
%
Unit
ps
ns
39