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参数资料
型号： MC7457RX867NC
厂商： Freescale Semiconductor
文件页数： 19/71页
文件大小： 0K
描述： IC MPU RISC 32BIT 483FCCBGA
标准包装： 36
系列： MPC74xx
处理器类型： 32-位 MPC74xx PowerPC
速度： 867MHz
电压： 1.1V
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
MPC7457 RISC Microprocessor Hardware Specifications, Rev. 8
Electrical and Thermal Characteristics
Freescale Semiconductor
26
5.2.4.2
L3 Bus AC Specifications for DDR MSUG2 SRAMs
When using DDR MSUG2 SRAMs at the L3 interface, the parts should be connected as shown in Figure 9.
Outputs from the MPC7457 are actually launched on the edges of an internal clock phase-aligned to
SYSCLK (adjusted for core and L3 frequency divisors). L3_CLK0 and L3_CLK1 are this internal clock
output with 90° phase delay, so outputs are shown synchronous to L3_CLK0 and L3_CLK1. Output valid
times are typically negative when referenced to L3_CLKn because the data is launched one-quarter period
before L3_CLKn to provide adequate setup time at the SRAM after the delay-matched address, control,
data, and L3_CLKn signals have propagated across the printed-wiring board.
Inputs to the MPC7457 are source-synchronous with the CQ clock generated by the DDR MSUG2
SRAMs. These CQ clocks are received on the L3_ECHO_CLKn inputs of the MPC7457. An internal
circuit delays the incoming L3_ECHO_CLKn signal such that it is positioned within the valid data
L3CLK
n_OH
All signals latched by
SRAM connected to
L3_CLK
n
0b000
tL3CHOV,
tL3CHDV,
tL3CLDV
0tL3CHOX,
tL3CHDX,
tL3CLDX
0ps
4
0b001
– 50
5
0b010
– 100
5
0b011
– 150
5
0b100
– 200
5
0b101
– 250
5
0b110
– 300
5
0b111
– 350
5
L3DOH
n
L3_DATA[
n:n+7],
L3_DP[
n/8]
0b000
tL3CHDV,
tL3CLDV
0tL3CHDX,
tL3CLDX
0ps
4
0b001
+ 50
0b010
+ 100
0b011
+ 150
0b100
+ 200
0b101
+ 250
0b111
+ 300
0b111
+ 350
Notes:
1. See the
MPC7450 RISC Microprocessor Family User’s Manual for specific information regarding L3OHCR.
2. See Table 13 and Table 14 for more information.
3. Approximate delay verified by simulation; not tested or characterized.
4. Default value.
5. Increasing values of L3CLK
n_OH delay the L3_CLKn signal, effectively decreasing the output valid and output hold times of
all signals latched relative to that clock signal by the SRAM; see Figure 9 and Figure 11.
Table 12. Effect of L3OHCR Settings on L3 Bus AC Timing (continued)
At recommended operating conditions. See Table 4.
Field Name1
Affected Signals
Value
Output Valid Time
Output Hold Time
Unit
Notes
Parameter
Symbol 2
Change 3
Parameter
Symbol 2
Change 3
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