参数资料
型号: MPC870VR80
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 80 MHz, RISC PROCESSOR, PBGA256
封装: LEAD FREE, PLASTIC, BGA-256
文件页数: 13/84页
文件大小: 1042K
代理商: MPC870VR80
MPC875/MPC870 PowerQUICC Hardware Specifications, Rev. 4
20
Freescale Semiconductor
Bus Signal Timing
B25
CLKOUT rising edge to OE,
WE(0:3)/BS_B[0:3] asserted
(MAX = 0.00
× B1 + 9.00)
9.00
9.00
ns
B26
CLKOUT rising edge to OE negated
(MAX = 0.00
× B1 + 9.00)
2.00
9.00
2.00
9.00
2.00
9.00
2.00
9.00
ns
B27
A(0:31) and BADDR(28:30) to CS asserted
GPCM ACS = 10, TRLX = 1
(MIN = 1.25
× B1 – 2.00)
35.90
29.30
16.90
13.60
ns
B27a
A(0:31) and BADDR(28:30) to CS asserted
GPCM ACS = 11, TRLX = 1
(MIN = 1.50
× B1 – 2.00)
43.50
35.50
20.70
16.75
ns
B28
CLKOUT rising edge to WE(0:3)/BS_B[0:3]
negated GPCM write access CSNT = 0
(MAX = 0.00
× B1 + 9.00)
9.00
9.00
9.00
9.00
ns
B28a
CLKOUT falling edge to WE(0:3)/BS_B[0:3]
negated GPCM write access TRLX = 0,
CSNT = 1, EBDF = 0
(MAX = 0.25
× B1 + 6.80)
7.60
14.30
6.30
13.00
3.80
10.50
3.13
9.93
ns
B28b
CLKOUT falling edge to CS negated GPCM
write access TRLX = 0, CSNT = 1 ACS = 10 or
ACS = 11, EBDF = 0
(MAX = 0.25
× B1 + 6.80)
14.30
13.00
10.50
9.93
ns
B28c
CLKOUT falling edge to WE(0:3)/BS_B[0:3]
negated GPCM write access TRLX = 0,
CSNT = 1 write access TRLX = 0, CSNT = 1,
EBDF = 1 (MAX = 0.375
× B1 + 6.6)
10.90
18.00
10.90
18.00
5.20
12.30
4.69
11.29
ns
B28d
CLKOUT falling edge to CS negated GPCM
write access TRLX = 0, CSNT = 1, ACS = 10
or ACS = 11, EBDF = 1
(MAX = 0.375
× B1 + 6.6)
18.00
18.00
12.30
11.30
ns
B29
WE(0:3)/BS_B[0:3] negated to D(0:31) High-Z
GPCM write access, CSNT = 0, EBDF = 0
(MIN = 0.25
× B1 – 2.00)
5.60
4.30
1.80
1.13
ns
B29a
WE(0:3)/BS_B[0:3] negated to D(0:31) High-Z
GPCM write access, TRLX = 0, CSNT = 1,
EBDF = 0 (MIN = 0.50
× B1 – 2.00)
13.20
10.50
5.60
4.25
ns
B29b
CS negated to D(0:31) High-Z GPCM write
access, ACS = 00, TRLX = 0 and CSNT = 0
(MIN = 0.25
× B1 – 2.00)
5.60
4.30
1.80
1.13
ns
B29c
CS negated to D(0:31) High-Z GPCM write
access, TRLX = 0, CSNT = 1, ACS = 10 or
ACS = 11, EBDF = 0 (MIN = 0.50
× B1 – 2.00)
13.20
10.50
5.60
4.25
ns
Table 10. Bus Operation Timings (continued)
Num
Characteristic
33 MHz
40 MHz
66 MHz
80 MHz
Unit
Min
Max
Min
Max
Min
Max
Min
Max
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