參數(shù)資料
型號(hào)： MPC755BRX300LX
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 300 MHz, RISC PROCESSOR, CBGA360
封裝： 25 X 25 MM, 3.20 MM HEIGHT, 1.27 MM PITCH, CERAMIC, BGA-360
文件頁(yè)數(shù)： 28/48頁(yè)
文件大?。?/td> 1265K
代理商： MPC755BRX300LX
34
MPC755 RISC Microprocessor Hardware Specifications
System Design Information
The MPC755 generates the clock for the external L2 synchronous data SRAMs by dividing the core clock
frequency of the MPC755. The divided-down clock is then phase-adjusted by an on-chip delay-lock-loop
(DLL) circuit and should be routed from the MPC755 to the external RAMs. A separate clock output,
L2SYNC_OUT is sent out half the distance to the SRAMs and then returned as an input to the DLL on pin
L2SYNC_IN so that the rising-edge of the clock as seen at the external RAMs can be aligned to the clocking
of the internal latches in the L2 bus interface.
The core-to-L2 frequency divisor for the L2 PLL is selected through the L2CLK bits of the L2CR register.
Generally, the divisor must be chosen according to the frequency supported by the external RAMs, the
frequency of the MPC755 core, and the phase adjustment range that the L2 DLL supports. Table 17 shows
various example L2 clock frequencies that can be obtained for a given set of core frequencies. The minimum
L2 frequency target is 80 MHz.
1111
PLL off
PLL off, no core clocking occurs
Notes:
1. PLL_CFG[0:3] settings not listed are reserved.
2. The sample bus-to-core frequencies shown are for reference only. Some PLL configurations may select bus, core,
or VCO frequencies which are not useful, not supported, or not tested for by the MPC755; see Section 1.4.2.1,
“Clock AC Specifications,” for valid SYSCLK, core, and VCO frequencies.
3. In PLL-bypass mode, the SYSCLK input signal clocks the internal processor directly, the PLL is disabled, and the
bus mode is set for 1:1 mode operation. This mode is intended for factory use and emulator tool use only.
Note: The AC timing specifications given in this document do not apply in PLL-bypass mode.
4. In PLL-off mode, no clocking occurs inside the MPC755 regardless of the SYSCLK input.
Table 17. Sample Core-to-L2 Frequencies
Core Frequency
in MHz
÷1
÷1.5
÷2
÷2.5
÷3
250
166
125
100
83
266
177
133
106
89
275
183
138
110
92
300
200
150
120
100
325
217
163
130
108
333
222
167
133
111
350
233
175
140
117
366
244
183
146
122
375
250
188
150
125
400
266
200
160
133
Note: The core and L2 frequencies are for reference only. Some examples
may represent core or L2 frequencies which are not useful, not
supported, or not tested for by the MPC755; see Section 1.4.2.3, “L2
Clock AC Specifications,” for valid L2CLK frequencies. The
L2CR[L2SL] bit should be set for L2CLK frequencies less than
110 MHz.
Table 16. MPC755 Microprocessor PLL Configuration (Continued)
PLL_CFG
[0:3]
Example Bus-to-Core Frequency in MHz (VCO Frequency in MHz)
Bus-to-
Core
Multiplier
Core-to
VCO
Multiplier
Bus
33 MHz
Bus
50 MHz
Bus
66 MHz
Bus
75 MHz
Bus
80 MHz
Bus
100 MHz
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