MPC8548E Freescale, MPC8548E Datasheet - Page 34

• Manufacturer Part Number: MPC8548E
• Description: Integrated Processor
• Manufacturer: Freescale

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Enhanced Three-Speed Ethernet (eTSEC)
Figure 14
8.2.4.2
Table 30
34
TSEC n _RX_CLK[0:1] clock period
TSEC n _RX_CLK[0:1] skew
TSEC n _RX_CLK[0:1] duty cycle
RCG[9:0] setup time to rising TSEC n _RX_CLK
RCG[9:0] hold time to rising TSEC n _RX_CLK
TSEC n _RX_CLK[0:1] clock rise time (20%–80%)
TSEC n _RX_CLK[0:1] clock fall time (80%–20%)
Notes:
1. The symbols used for timing specifications follow the pattern of t
2. Guaranteed by design.
inputs and t
timing (TR) with respect to the time data input signals (D) reach the valid state (V) relative to the t
going to the high (H) state or setup time. Also, t
signals (D) went invalid (X) relative to the t
reference symbol representation is based on three letters representing the clock of a particular functional. For example, the
subscript of t
appropriate letter: R (rise) or F (fall). For symbols representing skews, the subscript is skew (SK) followed by the clock that
is being skewed (TRX).
provides the TBI receive AC timing specifications.
shows the TBI transmit AC timing diagram.
(first two letters of functional block)(reference)(state)(signal)(state)
TRX
TBI Receive AC Timing Specifications
GTX_CLK
MPC8548E PowerQUICC™ III Integrated Processor Hardware Specifications, Rev. 4
TCG[9:0]
Parameter/Condition
represents the TBI (T) receive (RX) clock. For rise and fall times, the latter convention is used with the
Table 30. TBI Receive AC Timing Specifications
Figure 14. TBI Transmit AC Timing Diagram
t
TTXH
t
TTKHDV
t
TTXF
TRX
t
TTX
clock reference (K) going to the high (H) state. Note that, in general, the clock
TRDXKH
symbolizes TBI receive timing (TR) with respect to the time data input
t
Symbol
TRXH
t
t
t
TTXF
t
TRDVKH
TRDXKH
t
t
SKTRX
TRXR
TRXF
(first two letters of functional block)(signal)(state)(reference)(state)
t
TRX
for outputs. For example, t
/t
TRX
2
2
1
t
TTKHDX
t
TTXR
Min
7.5
2.5
1.5
0.7
0.7
40
—
t
TTXR
TRDVKH
16.0
Typ
—
—
—
—
—
—
TRX
Freescale Semiconductor
symbolizes TBI receive
clock reference (K)
Max
8.5
2.4
2.4
60
—
—
—
Unit
ns
ns
ns
ns
ns
ns
%
for