参数资料
型号: MC7457VG1267LC
厂商: Freescale Semiconductor
文件页数: 20/71页
文件大小: 0K
描述: IC MPU RISC 1267MHZ 483FCCBGA
标准包装: 36
系列: MPC74xx
处理器类型: 32-位 MPC74xx PowerPC
速度: 1.267GHz
电压: 1.3V
安装类型: 表面贴装
封装/外壳: 483-BCBGA,FCCBGA
供应商设备封装: 483-FCCBGA(29x29)
包装: 托盘
Electrical and Thermal Characteristics
MPC7457 RISC Microprocessor Hardware Specifications, Rev. 8
Freescale Semiconductor
27
window at the internal receiving latches. This delayed clock is used to capture the data into these latches
which comprise the receive FIFO. This clock is asynchronous to all other processor clocks. This latched
data is subsequently read out of the FIFO synchronously to the processor clock. The time between writing
and reading the data is set by the using the sample point settings defined in the L3CR register.
Table 13 provides the L3 bus interface AC timing specifications for the configuration as shown in
Figure 9, assuming the timing relationships shown in Figure 10 and the loading shown in Figure 8.
Table 13. L3 Bus Interface AC Timing Specifications for MSUG2
At recommended operating conditions. See Table 4.
Parameter
Symbol
Device Revision (L3 I/O Voltage) 9
Unit
Notes
Rev 1.1. (All I/O Modes)
Rev 1.2 (1.5-V I/O Mode)
Rev 1.2
(1.8-, 2.5-V I/O Modes)
Min
Max
Min
Max
L3_CLK rise and fall time
tL3CR, tL3CF
0.75
0.75
ns
1
Setup times: Data and parity
tL3DVEH,
tL3DVEL
(– tL3CLK/4)
+ 0.90
—(– tL3CLK/4)
+ 0.70
ns
2, 3, 4
Input hold times: Data and parity
tL3DXEH,
tL3DXEL
(tL3CLK/4)
+ 0.85
—(tL3CLK/4)
+ 0.70
—ns
2, 4
Valid times: Data and parity
tL3CHDV,
tL3CLDV
—(– tL3CLK/4)
+ 0.60
—(– tL3CLK/4)
+ 0.50
ns
5, 6,
7, 8
Valid times: All other outputs
tL3CHOV
—(tL3CLK/4)
+ 0.65
—(tL3CLK/4)
+ 0.65
ns
5, 7, 8
Output hold times: Data and parity
tL3CHDX,
tL3CLDX,
(tL3CLK/4)
– 0.60
—(tL3CLK/4)
– 0.50
—ns
5, 6,
7, 8
Output hold times: All other outputs
tL3CHOX
(tL3CLK/4)
– 0.50
—(tL3CLK/4)
– 0.50
ns
5, 7, 8
L3_CLK to high impedance: Data
and parity
tL3CLDZ
—(– tL3CLK/4)
+ 0.60
—(– tL3CLK/4)
+ 0.60
ns
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