參數(shù)資料
型號： MC7457VG1000NC
廠商： Freescale Semiconductor
文件頁數(shù)： 24/71頁
文件大小： 0K
描述： IC MPU RISC 1000MHZ 483FCCBGA
標準包裝： 36
系列： MPC74xx
處理器類型： 32-位 MPC74xx PowerPC
速度： 1.0GHz
電壓： 1.1V
安裝類型： 表面貼裝
封裝/外殼： 483-BCBGA，F(xiàn)CCBGA
供應(yīng)商設(shè)備封裝： 483-FCCBGA（29x29）
包裝： 托盤
MPC7457 RISC Microprocessor Hardware Specifications, Rev. 8
Electrical and Thermal Characteristics
Freescale Semiconductor
30
Figure 10 shows the L3 bus timing diagrams for the MPC7457 interfaced to MSUG2 SRAMs.
Figure 10. L3 Bus Timing Diagrams for L3 Cache DDR SRAMs
5.2.4.3
L3 Bus AC Specifications for PB2 and Late Write SRAMs
When using PB2 or Late Write SRAMs at the L3 interface, the parts should be connected as shown in
Figure 11. These SRAMs are synchronous to the MPC7457; one L3_CLKn signal is output to each SRAM
to latch address, control, and write data. Read data is launched by the SRAM synchronous to the delayed
L3_CLKn signal it received. The MPC7457 needs a copy of that delayed clock which launched the SRAM
read data to know when the returning data will be valid. Therefore, L3_ECHO_CLK1 and
L3_ECHO_CLK3 must be routed halfway to the SRAMs and returned to the MPC7457 inputs
L3_ECHO_CLK0 and L3_ECHO_CLK2, respectively. Thus, L3_ECHO_CLK0 and L3_ECHO_CLK2
are phase-aligned with the input clock received at the SRAMs. The MPC7457 will latch the incoming data
on the rising edge of L3_ECHO_CLK0 and L3_ECHO_CLK2.
Table 14 provides the L3 bus interface AC timing specifications for the configuration shown in Figure 11,
assuming the timing relationships of Figure 12 and the loading of Figure 8.
L3_ECHO_CLK[0,1,2,3]
L3 Data and Data
VM
VM = Midpoint Voltage (GVDD/2)
Parity Inputs
L3_CLK[0,1]
ADDR, L3CNTL
VM
tL3CHOV
tL3CHOX
VM
L3DATA WRITE
tL3CHOZ
VM
tL3CHDV
tL3CHDX
VM
Outputs
Inputs
tL3CLDV
tL3CLDX
tL3CLDZ
tL3DVEH
tL3DXEL
tL3DVEL
tL3DXEH
Note: t
L3DVEH and tL3DVEL as drawn here are negative numbers, that is, input setup time is
time after the clock edge.
Note: t
L3CHDV and tL3CLDV as drawn here will be negative numbers, that is, output valid time will be
time before the clock edge.
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