mpc880 Freescale Semiconductor, Inc, mpc880 Datasheet - Page 63

• Manufacturer Part Number: mpc880
• Description: Mpc885 Powerquicc Integrated Communications Processor
• Manufacturer: Freescale Semiconductor, Inc

12.9
Table 25
1
Freescale Semiconductor
151A
Num
SyncCLK must be at least twice as fast as SMCLK.
150
151
152
153
154
155
TENA(RTS1)
RENA(CD1)
Notes:
provides the SMC transparent timings as shown in
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
SMC Transparent AC Electrical Specifications
1.
2.
(Output)
(Note 2)
TCLK1
(Input)
(Input)
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.
TxD1
128
MPC885/MPC880 PowerQUICC™ Hardware Specifications, Rev. 4
133
1
131
Figure 64. Ethernet Transmit Timing Diagram
Table 25. SMC Transparent Timing
Characteristic
128
121
Figure
132
65.
129
All Frequencies
Min
100
50
50
10
20
—
5
CPM Electrical Characteristics
134
Max
15
50
—
—
—
—
—
Unit
ns
ns
ns
ns
ns
ns
ns
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