MPC875 Freescale Semiconductor, Inc, MPC875 Datasheet - Page 52

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

CPM Electrical Characteristics
1
2
3
4
52
Num
83a
The ratio SYNCCLK/L1RCLKB must be greater than 2.5/1.
These specs are valid for IDL mode only.
Where P = 1/CLKOUT. Thus, for a 25-MHz CLKO1 rate, P = 40 ns.
These strobes and TxD on the first bit of the frame become valid after the L1CLKB edge or L1SYNCB, whichever comes later.
84
85
86
87
88
(FE = 0, CE = 0)
(FE = 1, CE = 1)
L1RSYNCB
L1ST(2–1)
L1RCLKB
L1RCLKB
L1RCLKB, L1TCLKB width high (DSC = 1)
L1CLKB edge to L1CLKOB valid (DSC = 1)
L1RQB valid before falling edge of L1TSYNCB
L1GRB setup time
L1GRB hold time
L1CLKB edge to L1SYNCB valid (FSD = 00) CNT = 0000, BYT = 0,
DSC = 0)
L1RXDB
(Output)
(Input)
(Input)
(Input)
(Input)
Figure 48. SI Receive Timing Diagram with Normal Clocking (DSC = 0)
73
2
MPC875/MPC870 PowerQUICC™ Hardware Specifications, Rev. 4
71
Characteristic
76
Table 21. SI Timing (continued)
75
74
72
3
70
BIT0
4
RFSD=1
78
77
71a
P + 10
42.00
42.00
1.00
Min
—
—
All Frequencies
79
Freescale Semiconductor
30.00
Max
0.00
—
—
—
—
L1TCLK
Unit
ns
ns
ns
ns
ns