MPC875 Freescale Semiconductor, Inc, MPC875 Datasheet - Page 61

• Manufacturer Part Number: MPC875
• Description: Mpc875 Powerquicc Integrated Communications Processor
• Manufacturer: Freescale Semiconductor, Inc

13.8
Table 25
1
Freescale Semiconductor
151A
Num
150
151
152
153
154
155
SYNCCLK must be at least twice as fast as SMCLK.
Notes:
SMCLK clock period
SMCLK width low
SMCLK width high
SMCLK rise/fall time
SMTXD active delay (from SMCLK falling edge)
SMRXD/SMSYNC setup time
RXD1/SMSYNC hold time
TENA(RTS3)
provides the SMC transparent timings as shown in
SMC Transparent AC Electrical Specifications
RENA(CD3)
1.
2.
Transmit clock invert (TCI) bit in GSMR is set.
If RENA is negated before TENA or RENA is not asserted at all during transmit, then the
CSL bit is set in the buffer descriptor at the end of the frame transmission.
(Output)
TCLK3
(Note 2)
(Input)
TxD3
(Input)
MPC875/MPC870 PowerQUICC™ Hardware Specifications, Rev. 4
128
1
133
131
Figure 58. Ethernet Transmit Timing Diagram
Table 25. SMC Transparent Timing
Characteristic
128
121
Figure
132
59.
129
All Frequencies
Min
100
50
50
10
20
—
CPM Electrical Characteristics
5
134
Max
15
50
—
—
—
—
—
Unit
ns
ns
ns
ns
ns
ns
ns
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