mpc8641 Freescale Semiconductor, Inc, mpc8641 Datasheet - Page 11

• Manufacturer Part Number: mpc8641
• Description: Integrated Host Processor Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

2.1.3
Table 3
preliminary estimates.
DDR1 signal
DDR2 signal
Local Bus signals
eTSEC/10/100 signals
DUART, DMA, Multiprocessor Interrupts, System
Control & Clocking, Debug, Test, Power management,
JTAG and Miscellaneous I/O voltage
I
SRIO, PCI Express
Notes:
1. See the DDR Control Driver registers in the MPC8641D reference manual for more information.
2. Only the following local bus signals have programmable drive strengths: LALE, LAD[0:31], LDP[0:3], LA[27:31], LCKE,
3. See
4. Stub Series Terminated Logic (SSTL-25) type pins.
5. Stub Series Terminated Logic (SSTL-18) type pins.
6. Low Voltage Transistor-Transistor Logic (LVTTL) type pins.
7. Open Drain type pins.
8. Low Voltage Differential Signaling (LVDS) type pins.
9. The drive strength of the DDR interface in half strength mode is at T
2.2
The MPC8641 requires its power rails to be applied in a specific sequence in order to ensure proper device
operation.
The chronological order of power up is as follows:
Freescale Semiconductor
2
C
LCS[1:2], LWE[0:3], LGPL1, LGPL2, LGPL3, LGPL4, LGPL5, LCLK[0:2]. The other local bus signals have a fixed drive
strength of 45 Ω. See the POR Impedance Control register in the MPC8641D reference manual for more information about
local bus signals and their drive strength programmability.
SD n _IMP_CAL_RX transmit and receive signals.
1. All power rails other than DDR I/O (Dn_GV
Section 17, “Signal
provides information on the characteristics of the output driver strengths. The values are
Power Up/Down Sequence
Output Driver Characteristics
MPC8641 and MPC8641D Integrated Host Processor Hardware Specifications, Rev. 2
The recommended maximum ramp up time for power supplies is 20
milliseconds.
Driver Type
Listings,” for details on resistor requirements for the calibration of SD n _IMP_CAL_TX and
Table 3. Output Drive Capability
NOTE
36 (half strength mode)
36 (half strength mode)
Output Impedance
DD
Programmable
, and Dn_MV
j
150
100
= 105C and at D n _GV
(Ω)
18
18
45
25
45
30
45
REF
).
DD
SV
D n _GV
D n _GV
T/LV
T/LV
OV
OV
OV
DD
(min).
Voltage
Supply
DD
DD
DD
= 1.1/1.05 V
DD
DD
DD
DD
Electrical Characteristics
= 3.3 V
= 3.3 V
= 3.3 V
= 3.3 V
= 2.5 V
= 2.5 V
= 1.8 V
Notes
1, 5, 9
4, 9
2, 6
3, 8
6
6
6
7
11