mpc8641 Freescale Semiconductor, Inc, mpc8641 Datasheet - Page 30

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

Ethernet: Enhanced Three-Speed Ethernet (eTSEC), MII Management
8.2
The AC timing specifications for FIFO, GMII, MII, TBI, RGMII, RMII and RTBI are presented in this
section.
8.2.1
The basis for the AC specifications for the eTSEC’s FIFO modes is the double data rate RGMII and RTBI
specifications, since they have similar performance and are described in a source-synchronous fashion like
FIFO modes. However, the FIFO interface provides deliberate skew between the transmitted data and
source clock in GMII fashion.
When the eTSEC is configured for FIFO modes, all clocks are supplied from external sources to the
relevant eTSEC interface. That is, the transmit clock must be applied to the eTSECn’s TSECn_TX_CLK,
while the receive clock must be applied to pin TSECn_RX_CLK. The eTSEC internally uses the transmit
30
1
2
3
Input low current
(V
Notes:
1
2
3
Supply voltage 2.5 V
Output high voltage
(LV
Output low voltage
(LV
Input high voltage
Input low voltage
Input high current
(V
Input low current
(V
Note:
LV
TV
The symbol V
IN
LV
TV
Note that the symbol V
IN
IN
DD
DD
DD
= GND)
DD
DD
= LV
= GND)
DD
/TV
/TV
supports eTSECs 1 and 2.
supports eTSECs 3 and 4.
supports eTSECs 1 and 2.
supports eTSECs 3 and 4.
DD
FIFO, GMII, MII, TBI, RGMII, RMII, and RTBI AC Timing
Specifications
DD
DD
, V
Parameter
FIFO AC Specifications
= Min, I
= Min, I
Table 24. GMII, MII, RMII, TBI and FIFO DC Electrical Characteristics (continued)
IN
IN
Parameters
MPC8641 and MPC8641D Integrated Host Processor Hardware Specifications, Rev. 2
, in this case, represents the LV
= TV
Table 25. GMII, RGMII, RTBI, TBI and FIFO DC Electrical Characteristics
OH
OL
DD
= 1.0 mA)
= –1.0 mA)
)
IN
, in this case, represents the LV
Symbol
I
IL
LV
Symbol
DD
IN
V
V
V
V
I
I
OH
/TV
OL
IH
IL
IH
IL
and TV
DD
–600
Min
IN
IN
symbols referenced in
and TV
2.375
2.00
1.70
Min
–15
—
—
—
IN
symbols referenced in
Max
—
2.625
Max
0.40
0.90
10
Table 1
—
—
—
and
Table 1
Unit
μA
Table
Freescale Semiconductor
Unit
μA
μA
V
V
V
V
V
and
2.
Table
Notes
2.
Notes
1, 2,3
3
1,2
—
—
—
—
3