mpc8245ec Freescale Semiconductor, Inc, mpc8245ec Datasheet - Page 22

• Manufacturer Part Number: mpc8245ec
• Description: Mpc8245 Integrated Host Processor
• Manufacturer: Freescale Semiconductor, Inc

Electrical and Thermal Characteristics
Figure 11
PCI_SYNC_IN, respectively.
22
SDRAM_SYNC_IN
Shown in 2:1 Mode
Notes:
VM = Midpoint voltage (1.4 V).
10b-d = Input signals valid timing.
11a = Input hold time of SDRAM_SYNC_IN to memory.
12b-d = sys_logic_clk to output valid timing.
13b = Output hold time for non-PCI signals.
14b = SDRAM-SYNC_IN to output high-impedance timing for non-PCI signals.
T
os
PCI_SYNC_IN
Inputs/Outputs
(after DLL locks)
and
PCI_SYNC_IN
Inputs/Outputs
= Offset timing required to align sys_logic_clk with SDRAM_SYNC_IN. The SDRAM_SYNC_IN signal
sys_logic_clk
is adjusted by the DLL to accommodate for internal delay. This causes SDRAM_SYNC_IN to appear
before sys_logic_clk once the DLL locks.
Figure 12
Figure 11. Input/Output Timing Diagram Referenced to SDRAM_SYNC_IN
Memory
Figure 12. Input/Output Timing Diagram Referenced to PCI_SYNC_IN
PCI
MPC8245 Integrated Processor Hardware Specifications, Rev. 10
show the input/output timing diagrams referenced to SDRAM_SYNC_IN and
10a
10b-d
Input Timing
T
Input Timing
os
0.4 × OV
VM
VM
VM
OV
DD
DD
÷ 2
11a
11c
2.0 V
0.8 V
OV
2.0 V
0.8 V
12a
DD
VM
12b-d
÷ 2
Output Timing
0.615 × OV
0.285 × OV
Output Timing
14a
13a
DD
DD
14b
13b
OV
Freescale Semiconductor
DD
VM
÷ 2