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參數(shù)資料
| 型號： | MPC755 |
| 廠商： | Motorola, Inc. |
| 英文描述： | RISC Microprocessor Hardware Specifications |
| 中文描述： | RISC微處理器硬件規(guī)格 |
| 文件頁數(shù)： | 41/56頁 |
| 文件大?。?/td> | 1652K |
| 代理商： | MPC755 |
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MPC755 RISC Microprocessor Hardware Specifications, Rev. 6.1
Freescale Semiconductor
41
System Design Information
Figure 23
describes the alternate driver impedance measurement circuit.
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.
8.6
Pull-Up Resistor Requirements
The MPC755 requires pull-up resistors (1
5 k
) 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
5 k
) 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
1 k
)
. These pins are L1_TSTCLK, L2_TSTCLK, and
LSSD_MODE. These signals are for factory use only and must be pulled up to OV
DD
for normal machine
operation.
In addition, CKSTP_OUT is an open-drain style output that requires a pull-up resistor (1
5 k
) 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
Table 18. Impedance Characteristics
V
DD
= 2.0 V, OV
DD
= 3.3 V, T
j
= 0°
–
105°C
Impedance
Processor Bus
L2 Bus
Symbol
Unit
R
N
25–36
25–36
Z
0
R
P
26
–
39
26–39
Z
0
(L2)OV
DD
BGA
Pin
Data
V
force
OGND
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| MPC755BRX300LE | 功能描述:微處理器 - MPU 360CBGARV2.8HIP4DP 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 |
| MPC755BRX350LE | 功能描述:微處理器 - MPU 360CBGA,RV2.8,HIP4DP 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 |
| MPC755BRX350TE | 功能描述:微處理器 - MPU 360CBGA,RV2.8,HIP4DP 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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