參數(shù)資料
型號： MPC755BRX400LE
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 400 MHz, RISC PROCESSOR, CBGA360
封裝： 25 X 25 MM, CERAMIC, BGA-360
文件頁數(shù)： 31/52頁
文件大?。?/td> 1276K
代理商： MPC755BRX400LE
MOTOROLA
MPC755 RISC Microprocessor Hardware Specifications
37
System Design Information
Figure 23. Alternate Driver Impedance Measurement Circuit
Table 18 summarizes the signal impedance results. The driver impedance values were characterized at 0°,
65°, and 105°C. The impedance increases with junction temperature and is relatively unaffected by bus
voltage.
1.8.6
Pull-Up Resistor Requirements
The MPC755 requires pull-up resistors (1 k
5k) on several control pins of the bus interface to maintain
the control signals in the negated state after they have been actively negated and released by the MPC755
or other bus masters. These pins are TS, ABB, AACK, ARTRY, DBB, DBWO, TA, TEA, and DBDIS.
DRTRY should also be connected to a pull-up resistor (1 k
5k) if it will be used by the system;
otherwise, this signal should be connected to HRESET to select NO-DRTRY mode (see the MPC750 RISC
Microprocessor Family User’s Manual for more information on this mode).
Three test pins also require pull-up resistors (100
1k). These pins are L1_TSTCLK, L2_TSTCLK,
and LSSD_MODE. These signals are for factory use only and must be pulled up to OVDD for normal
machine operation.
In addition, CKSTP_OUT is an open-drain style output that requires a pull-up resistor (1 k
5k) if it is
used by the system.
During inactive periods on the bus, the address and transfer attributes may not be driven by any master and
may, therefore, float in the high-impedance state for relatively long periods of time. Since the MPC755 must
continually monitor these signals for snooping, this float condition may cause additional power draw by the
input receivers on the MPC755 or by other receivers in the system. These signals can be pulled up through
weak (10 k
) pull-up resistors by the system or may be otherwise driven by the system during inactive
periods of the bus to avoid this additional power draw, but address bus pull-up resistors are not neccessary
Table 18. Impedance Characteristics
VDD = 2.0 V, OVDD = 3.3 V, Tj = 0°–105°C
Impedance
Processor Bus
L2 Bus
Symbol
Unit
RN
25–36
Z0
RP
26
–39
26–39
Z0
(L2)OVDD
BGA
Data
Pin
Vforce
OGND
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MPC755BVT350LE 功能描述:微處理器 - MPU RV2.8,106C RoHS:否 制造商:Atmel 處理器系列:SAMA5D31 核心:ARM Cortex A5 數(shù)據(jù)總線寬度:32 bit 最大時鐘頻率:536 MHz 程序存儲器大小:32 KB 數(shù)據(jù) RAM 大小:128 KB 接口類型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作電源電壓:1.8 V to 3.3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FBGA-324
MPC755CPX350LE 功能描述:微處理器 - MPU 360PBGA,RV2.8,6W RoHS:否 制造商:Atmel 處理器系列:SAMA5D31 核心:ARM Cortex A5 數(shù)據(jù)總線寬度:32 bit 最大時鐘頻率:536 MHz 程序存儲器大小:32 KB 數(shù)據(jù) RAM 大小:128 KB 接口類型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作電源電壓:1.8 V to 3.3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FBGA-324
MPC755CPX400LE 功能描述:微處理器 - MPU GF RV2.8360PBGA 4A105C RoHS:否 制造商:Atmel 處理器系列:SAMA5D31 核心:ARM Cortex A5 數(shù)據(jù)總線寬度:32 bit 最大時鐘頻率:536 MHz 程序存儲器大小:32 KB 數(shù)據(jù) RAM 大小:128 KB 接口類型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作電源電壓:1.8 V to 3.3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FBGA-324
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