- 您现在的位置：买卖IC网 > PDF目录383307 > MA17501 (Dynex Semiconductor Ltd.) Radiation Hard MIL-STD-1750A Execution unit PDF资料下载
参数资料
| 型号： | MA17501 |
| 厂商： | Dynex Semiconductor Ltd. |
| 英文描述： | Radiation Hard MIL-STD-1750A Execution unit |
| 中文描述： | 辐射硬的MIL - STD - 1750A执行单元 |
| 文件页数： | 6/35页 |
| 文件大小： | 431K |
| 代理商： | MA17501 |
第1页第2页第3页第4页第5页当前第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页
MA17501
6/35
3.0 INTERFACE SIGNALS
All signals comply with the voltage levels of Table 1. ln
addition, each of these functions is provided with Electrostatic
Discharge (ESD) protection diodes. All unused inputs must be
held to their inactive state via a connection to VDD or GND. A
500-ohm pull-up at the OSC input pin is recommended to
damp line reflections.
Throughout this data sheet, active low signals are denoted
by either a bar over the signal name or by following the name
with an "N" suffix, e.g., HOLDN. Referenced signals that are
not found on the MA17501 are preceded by the originating
chip's functional acronym in parentheses, e.g., (lU)DMARN.
A description of each pin function, grouped according to
functional interface, follows. The function acronym is
presented first, followed by its definition, its type, and its
detailed description. Function type is either input, output, high
impedance (Hi-z), or a combination thereof. Timing
characteristics of each of the functions described is provided in
Section 5.0.
3.1 POWER INTERFACE
The power interface consists of one 5V VDD connection
and three common GND pins.
3.2 CLOCKS
The Execution Unit provides the synchronisation clocks for
the MAS281 chip set. Together these clocks form the basic
operation cycle.
3.2.1 Oscillator (OSC)
lnput. The MA17501 requires a single external oscillator
input for operation. The EU converts the oscillator into the five
other clocks listed in this section. To minimise skew between
OSC edges and signals derived from OSC, the OSC rise and
fall times should be minimised. lt is recommended that a clock
driver with high drive capability, such as a 54AS244,
54ALS244 or 54HST240, be used to drive the OSC input.
ln order to avoid double clocking due to line reflections, a
500-ohm pull-up resistor, placed close to the EU, is
recommended.
3.2.2 Synchronisation Clock (SYNCN)
Output. The MA17501 provides the MAS281
Synchronisation Clock output to synchronise external circuitry
to the MAS281 machine cycle. The high-to-low transition of
this signal indicates the start of a new machine cycle.
SYNCN cycles associated with external memory or l/O bus
transactions are a minimum of five OSC cycles in duration and
may be extended by inserting wait states via the RDYN input.
SYNCN low indicates that either an address or XlO command
is on the AD Bus; a high indicates data is on the bus. Wait
states extend the high state of SYNCN.
SYNCN cycles associated with internal CPU operations
are either five or six OSC cycles in duration. Six OSC cycles
are required for machine cycles associated with microcode
branches or with the execution of internally (Interrupt Unit)
decoded XlO commands. Five OSC cycles are used for all
other internal operations, e.g., register to register transfers,
ALU functions, etc.
[NOTE: For MAS281s operating at high OSC frequencies,
the lnterrupt Unit logic that creates lRDYN may cause a wait
state to be inserted during execution of internal XlO
commands. This would result in a SYNCN cycle of seven OSC
cycles duration. Though unlikely, this condition must be taken
into account in implementing a RDYN generation circuit. Refer
to the description of the RDYN signal for further details].
3.2.3 IU Synchronisation Clock (SYNCLKN)
Output. The SYNCLKN signal is a logical equivalent of the
SYNCN signal provided for Interrupt Unit synchronisation.
3.2.4 System Clock (SYSCLK1N)
Output. SYSCLK1N is the MA17501's synchronization
clock. It is the logical equivalent of SYNCN and SYNCLKN with
the exception that during PAUSEN low or during HLDAKN low,
SYSCLK1N is held in its low state. SYSCLK1N, like
SYNCLKN, has a VSS to VDD logic level swing.
3.2.5 Precharge Clock (CLKPCN)
Output. CLKPCN is used by the MA17502 Control Unit
(CU) to synchronize the precharging of the internal M Bus and
most other CU operations to the MAS281 machine cycle.
CLKPCN cycles associated with MAS281 external memory
or l/O bus transactions are a minimum of five OSC cycles in
duration and are extended when wait states are inserted via
the RDYN input. CLKPCN low indicates that the internal CU M
Bus is being precharged to the high state; the low-to-high
transition places the lower 20 bits of a microinstruction on the
external M Bus. Wait states extend the high state of CLKPCN.
When PAUSEN or HLDAKN is low, CLKPCN is held low.
CLKPCN cycles associated with internal MAS281
operations are either five or six OSC cycles in duration. Six
OSC cycles are required for machine cycles associated with
microcode branches or with the execution of internally
(lnterrupt Unit) decoded XlO commands. Five OSC cycles are
used for all other internal operations, e.g., register to register
transfers, ALU functions, etc.
[NOTE: For MAS281s operating at high OSC frequencies,
the lnterrupt Unit logic that creates lRDYN may cause a wait
state to be inserted during execution of internal XlO
commands. This would result in a CLKPCN cycle of seven
OSC cycles duration.]
相关PDF资料 |
PDF描述 |
|---|---|
| MA17502 | Radiation Hard MIL-STD-1750A Control Unit |
| MA17503 | Radiation Hard MIL-STD-1750A Interrupt Unit |
| MA1916 | Radiation Hard Reed-Solomon & Convolution Encoder |
| MA28139 | OBDH Bus Terminal |
| MA28140 | Packet Telecommand Decoder |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MA17502 | 制造商:DYNEX 制造商全称:Dynex Semiconductor 功能描述:Radiation Hard MIL-STD-1750A Control Unit |
| MA17503 | 制造商:DYNEX 制造商全称:Dynex Semiconductor 功能描述:Radiation Hard MIL-STD-1750A Interrupt Unit |
| MA1751E12B1+6-FSR-EM | 制造商:Mechatronics Fan Group 功能描述: |
| MA1751E12B-FSR | 功能描述:FAN AXIAL 172X150X51MM 12VDC 制造商:mechatronics fan group 系列:MA1751 零件状态:有效 电压 - 额定:12VDC 大小/尺寸:矩形/圆形 - 172mm 长 x 150mm 高 宽度:50.80mm 气流:269.2 CFM(7.62m3/min) 静压力:0.670 英寸水柱（166.9 Pa） 轴承类型:滚珠 风扇类型:管轴式 特性:- 噪声:61 dB（A） 功率（W）:- RPM:3150 RPM 端接:2 引线 侵入防护:- 工作温度:- 认可:UL 额定电流:2.2A 电压范围:- 材料 - 框架:铝 材料 - 刀片:聚对苯二甲酸丁二酯（PBT） 重量:1.6 磅（725.7g） 标准包装:20 |
| MA1751E24B-FSR | 功能描述:AXIAL FAN 172X150X51MM 24VDC 制造商:mechatronics fan group 系列:* 零件状态:在售 标准包装:1 |
发布紧急采购，3分钟左右您将得到回复。