mpc8640 Freescale Semiconductor, Inc, mpc8640 Datasheet - Page 27

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

1
2
3
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 because 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
Freescale Semiconductor
Input low current
(V
Notes:
1. LV
2. TV
3. The symbol V
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
Note that the symbol V
IN
IN
IN
DD
DD
DD
= GND)
= LV
= GND)
DD
DD
DD
/TV
/TV
supports eTSECs 1 and 2.
supports eTSECs 3 and 4.
supports eTSECs 1 and 2
supports eTSECs 3 and 4
DD
DD
DD
FIFO, GMII, MII, TBI, RGMII, RMII, and RTBI AC Timing
Specifications
, V
= Min, I
= Min, I
Parameter
FIFO AC Specifications
IN
Table 24. GMII, MII, RMII, TBI and FIFO DC Electrical Characteristics (continued)
IN
Parameter
= TV
MPC8640 and MPC8640D Integrated Host Processor Hardware Specifications, Rev. 3
, in this case, represents the LV
OH
OL
Table 25. GMII, RGMII, RTBI, TBI and FIFO DC Electrical Characteristics
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
IH
/TV
OL
IL
IH
IL
and TV
DD
–600
IN
Min
IN
and TV
Ethernet: Enhanced Three-Speed Ethernet (eTSEC), MII Management
symbols referenced in
2.375
2.00
1.70
Min
–15
—
—
—
IN
symbols referenced in
Max
—
2.625
Table 1
Max
0.40
0.90
10
—
—
—
and
Table 1
Table 2
Unit
μA
and
Unit
μA
μA
V
V
V
V
V
Table
2.
Notes
Notes
1, 2, 3
3
1, 2
—
—
—
—
3
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