參數(shù)資料
型號: 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): 30/80頁
文件大?。?/td> 790K
代理商: MPC5200
MPC5200 Data Sheet, Rev. 4
Electrical and Thermal Characteristics
Freescale Semiconductor
30
3.3.7.2
Burst Mode
Table 25. Burst Mode Timing
NOTES:
1. Wait States (WS) can be programmed in the Chip Select X Register, Bit field WaitP and WaitX. It can be specified 0 - 65535.
2. Example:
Long Burst is used, this means the CS related BERx and SLB bits of the Chip Select Burst Control Register are set and a
burst on the internal XLB is executed. => LB = 1
Data bus width is 8 bit. => DS = 8
=> 4
1
*2*(32/
8
) = 32 => ACK is asserted for 32 PCI cycles to transfer one cache line.
Wait State is set to 10. => WS = 10
1+
10
+32 = 43 => CS is asserted for 43 PCI cycles.
3. ACK is output and indicates the burst.
Sym
Description
Min
Max
Units Notes SpecID
t
CSA
PCI CLK to CS assertion
-
1.8
ns
A7.20
t
CSN
PCI CLK to CS negation
-
1.8
ns
A7.21
t
1
CS pulse width
(1+WS+4
LB
*2*(32/DS))*
t
PCIck
(1+WS+4
LB
*2*(32/DS))
*t
PCIck
ns
1,2
A7.22
t
2
ADDR valid before CS assertion
t
IPBIck
t
PCIck
ns
A7.23
t
3
ADDR hold after CS negation
-
-0.7
ns
A7.24
t
4
OE assertion before CS assertion
-
0.4
ns
A7.25
t
5
OE negation before CS negation
-
0.4
ns
A7.26
t
6
RW valid before CS assertion
t
PCIck
-
ns
A7.27
t
7
RW hold after CS negation
t
PCIck
-
ns
A7.28
t
8
DATA setup before rising edge of
PCI
1.8
-
ns
A7.29
t
9
DATA hold after rising edge of PCI
0
-
ns
A7.30
t
10
DATA hold after CS negation
0
(DC+1)*t
PCIck
ns
A7.31
t
11
ACK assertion after CS assertion
-
(WS+1)*t
PCIck
ns
A7.32
t
12
ACK negation before CS negation
-
0.6
ns
3
A7.33
t
13
ACK pulse width
4
LB
*2*(32/DS)*t
PCIck
4
LB
*2*(32/DS)*t
PCIck
ns
2,3
A7.34
t
14
CS assertion after TS assertion
-
0.8
ns
A7.35
t
15
TS pulse width
t
PCIck
t
PCIck
ns
A7.36
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