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| 型号： | MPC8555CPXAJEX |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 533 MHz, RISC PROCESSOR, PBGA783 |
| 封装： | 29 X 29 MM, 3.75 MM HEIGHT, 1 MM PITCH, FLIP CHIP, PLASTIC, BGA-783 |
| 文件页数： | 50/88页 |
| 文件大小： | 1244K |
| 代理商： | MPC8555CPXAJEX |
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MPC8555E PowerQUICC III Integrated Communications Processor Hardware Specifications, Rev. 4
54
Freescale Semiconductor
PCI
13.2
PCI AC Electrical Specifications
This section describes the general AC timing parameters of the PCI bus of the MPC8555E. Note that the
SYSCLK signal is used as the PCI input clock. Table 42 provides the PCI AC timing specifications at 66
MHz.
NOTE
PCI Clock can be PCI1_CLK or SYSCLK based on POR config input.
NOTE
The input setup time does not meet the PCI specification.
Figure 15 provides the AC test load for PCI.
Figure 38. PCI AC Test Load
Table 42. PCI AC Timing Specifications at 66 MHz
Parameter
Symbol 1
Min
Max
Unit
Notes
Clock to output valid
tPCKHOV
—
6.0
ns
2, 3
Output hold from Clock
tPCKHOX
2.0
—
ns
2, 9
Clock to output high impedance
tPCKHOZ
—
14
ns
2, 3, 10
Input setup to Clock
tPCIVKH
3.3
—
ns
2, 4, 9
Input hold from Clock
tPCIXKH
0
—
ns
2, 4, 9
REQ64 to HRESET 9 setup time
tPCRVRH
10
× t
SYS
—
clocks
5, 6, 10
HRESET to REQ64 hold time
tPCRHRX
050
ns
6, 10
HRESET high to first FRAME assertion
tPCRHFV
10
—
clocks
7, 10
Notes:
1. Note that the symbols used for timing specifications herein follow the pattern of t(first two letters of functional block)(signal)(state)
(reference)(state) for inputs and t(first two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tPCIVKH
symbolizes PCI timing (PC) with respect to the time the input signals (I) reach the valid state (V) relative to the SYSCLK
clock, tSYS, reference (K) going to the high (H) state or setup time. Also, tPCRHFV symbolizes PCI timing (PC) with respect to
the time hard reset (R) went high (H) relative to the frame signal (F) going to the valid (V) state.
2. See the timing measurement conditions in the PCI 2.2 Local Bus Specifications.
3. For purposes of active/float timing measurements, the Hi-Z or off state is defined to be when the total current delivered
through the component pin is less than or equal to the leakage current specification.
4. Input timings are measured at the pin.
5. The timing parameter tSYS indicates the minimum and maximum CLK cycle times for the various specified frequencies. The
system clock period must be kept within the minimum and maximum defined ranges. For values see Section 15, “Clocking.”
6. The setup and hold time is with respect to the rising edge of HRESET.
7. The timing parameter tPCRHFV is a minimum of 10 clocks rather than the minimum of 5 clocks in the PCI 2.2 Local Bus
Specifications.
8. The reset assertion timing requirement for HRESET is 100
μs.
9. Guaranteed by characterization.
10.Guaranteed by design.
Output
Z0 = 50 Ω
OVDD/2
RL = 50 Ω
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