參數(shù)資料
型號(hào): MPC5200
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: Hardware Specifications
中文描述: 硬件規(guī)格
文件頁數(shù): 28/80頁
文件大小: 790K
代理商: MPC5200
MPC5200 Data Sheet, Rev. 4
Electrical and Thermal Characteristics
Freescale Semiconductor
28
3.3.7
Local Plus Bus
The Local Plus Bus is the external bus interface of the MPC5200. Maximum eight configurable
Chip-selects are provided. There are two main modes of operation: non-MUXed (Legacy and Burst) and
MUXED. The reference clock is the PCI CLK. The maximum bus frequency is 66 MHz.
Definition of Acronyms and Terms:
WS = Wait State
DC = Dead Cycle
LB = Long Burst
DS = Data size in Byte
tPCIck = PCI clock period
tIPBIck = IPBI clock period
Figure 11. Timing Diagram—IPBI and PCI clock (example ratio: 4:1)
3.3.7.1
Non-MUXed Mode
Table 24. Non-MUXed Mode Timing
Sym
Description
Min
Max
Units
Notes
SpecID
t
CSA
PCI CLK to CS assertion
-
1.8
ns
A7.1
t
CSN
PCI CLK to CS negation
-
1.8
ns
A7.2
t
1
CS pulse width
(2+WS)*t
PCIck
(2+WS)*t
PCIck
ns
1
A7.3
t
2
ADDR valid before CS assertion
t
IPBIck
t
PCIck
ns
A7.4
t
3
ADDR hold after CS negation
t
IPBIck
-
ns
2
A7.5
t
4
OE assertion before CS assertion
-
0.4
ns
A7.6
t
5
OE negation before CS negation
-
0.4
ns
A7.7
t
6
RW valid before CS assertion
t
PCIck
-
ns
A7.8
t
7
RW hold after CS negation
t
IPBIck
-
ns
A7.9
t
8
DATA output valid before CS assertion
t
IPBIck
-
ns
A7.10
t
9
DATA output hold after CS negation
t
IPBIck
-
ns
A7.11
t
10
DATA input setup before CS negation
2.8
-
ns
A7.12
t
11
DATA input hold after CS negation
0
(DC+1)*t
PCIck
ns
A7.13
t
12
ACK assertion after CS assertion
t
PCIck
-
ns
3
A7.14
t
13
ACK negation after CS negation
-
t
PCIck
ns
3
A7.15
PCI CLK
IPBI CLK
tIPBIck
tPCIck
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