mpc8241tzq266c Freescale Semiconductor, Inc, mpc8241tzq266c Datasheet - Page 15

• Manufacturer Part Number: mpc8241tzq266c
• Description: Mpc8241 Integrated Processor Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

Figure 6
DLL locking range loop delay versus frequency of operation.
Freescale Semiconductor
At recommended operating conditions (see
Notes:
1. Rise and fall times for the PCI_SYNC_IN input are measured from 0.4 through 2.4 V.
2. Specification value at maximum frequency of operation.
3. Pin-to-pin skew includes quantifying the additional amount of clock skew (or jitter) from the DLL besides any intentional skew
4. Relock time is guaranteed by design and characterization. Relock time is not tested.
5. Relock timing is guaranteed by design. PLL-relock time is the maximum amount of time required for PLL lock after a stable
6. DLL_EXTEND is bit 7 of the PMC2 register <72>. N is a non-zero integer (see
7. Rise and fall times for the OSC_IN input are guaranteed by design and characterization. OSC_IN input rise and fall times are
Num
added to the clocking signals from the variable length DLL synchronization feedback loop, that is, the amount of variance
between the internal sys_logic_clk and the SDRAM_SYNC_IN signal after the DLL is locked. While pin-to-pin skew between
SDRAM_CLKs can be measured, the relationship between the internal sys_logic_clk and the external SDRAM_SYNC_IN
cannot be measured and is guaranteed by design.
V
disabled and subsequently re-enabled during sleep mode. Also note that HRST_CPU/HRST_CTRL must be held asserted
for a minimum of 255 bus clocks after the PLL-relock time during the reset sequence.
of one SDRAM_SYNC_OUT clock cycle in ns. T
board runner) from SDRAM_SYNC_OUT to SDRAM_SYNC_IN in ns; 6.25 inches of loop length (unloaded PC board runner)
corresponds to approximately 1 ns of delay. For details about how
Freescale application note AN2164, MPC8245/MPC8241 Memory Clock Design Guidelines, for details on MPC8241 memory
clock design.
not tested.
21
DD
and PCI_SYNC_IN are reached during the reset sequence. This specification also applies when the PLL has been
shows the PCI_SYNC_IN input clock timing diagram, and
OSC_IN frequency stability
PCI_SYNC_IN
Characteristics and Conditions
MPC8241 Integrated Processor Hardware Specifications, Rev. 10
Table 8. Clock AC Timing Specifications (continued)
Figure 6. PCI_SYNC_IN Input Clock Timing Diagram
VM
Table
5a
2) with LV
VM = Midpoint Voltage (1.4 V)
1
loop
VM
DD
is the propagation delay of the DLL synchronization feedback loop (PC
= 3.3 V ± 0.3 V
5b
VM
Figure 7
CV
IL
Min
through
—
CV
Figure 7
Figure 7
IH
2
Figure 10
through
Electrical and Thermal Characteristics
through
Max
100
may be used, refer to the
Figure
Figure 10
10). T
Unit
ppm
clk
3
is the period
show the
Notes
15