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| 型號： | PSD312 |
| 英文描述： | Field Programmable Microcontroller Peripherals(可編程邏輯,16K位SRAM,4位頁寄存器,19個可編程I/O,通用PLD有16個輸入) |
| 中文描述： | 現(xiàn)場可編程微控制器外圍設(shè)備（可編程邏輯，16K的位的SRAM，4位頁寄存器，19個可編程的I / O，通用PLD的有16個輸入） |
| 文件頁數(shù)： | 2/14頁 |
| 文件大?。?/td> | 144K |
| 代理商： | PSD312 |
1-282
PSD3XX – Application Note 032
Design
Philosophy
(Cont.)
The system PSD3XX is removed from its socket and the test adapter is inserted between
the socket and the System PSD3XX. A short cable is connected between the interface pins
of the adapter and a small printed circuit adapter board which contains the second PSD3XX
and an EPROM socket(s). This board can be designed for both an 8-bit and 16-bit data
bus, although more complex 16-bit designs would most probably use an In-Circuit Emulator
for debugging.
The following design procedure uses some of the more popular microcontrollers for
illustration:
1. Design The ROM Emulator Adapter Board.
1) 8-Bit Multiplexed Address/Data Bus...Figure 2 shows an Interface Diagram for the two
components necessary for this bus interface – the Simulator PSD3XX and a 32-pin
JEDEC EPROM socket. Port A is used to latch the low order address byte from the
microcontroller. PB7 is used as address line A16 to the EPROM Socket, utilizing the
Page Register logic of the PSD3X2 and PSD3X3 for memory page switching. In order
to use the page register, an I/O base address must be specified. The base address
selected in this example is B000 which corresponds with the unused portion of the
system memory map shown in Figure 6. This was done to ensure that no conflicts
occur between the system and emulator PSD parts. PB6 is used to generate the RD
signal which is converted to the OE pin of the EPROM. This same schematic can be
used for the 80C31 family by making the following changes to the PSD3XX interface
signals:
Change E to RD
Change AS to ALE
Disconnect BHE/PSEN from V
CC
and connect to PSEN
2) 16-Bit Multiplexed Address/Data Bus... (see Figure 3) for this application, an additional
74HC373/573 latch is required to latch the high order address byte from the
microcontroller. Two EPROM sockets are shown, although one socket could be used
if the Emulator can plug into a 64K x 16 socket.
3) 8-Bit Separate Address and Data Bus... Figure 4 is an Interface Diagram similar to
Figure 2, except that Port A is not needed to separate the Address and Data Buses.
2. Configure all the parameters on the system PSD3XX except the 8 internal EPROM
Chip Selects (ES0 – ES7). These remain inactive and will be emulated by the Emulator
PSD3XX. The level of integration and ease of programming of the PSD3XX allow these
temporary configuraton changes that are necessary to use ROM Emulation without
impacting the existing system hardware design.
3. In the Emulator PSD3XX, configure the eight product terms of Port B pins 0 and 1
(OD configuration) to correspond to the internal Chip Select (ES0 – ES7) addresses of
the EPROM memory map of the System PSD3XX selected by the system software.
This is the combined Chip Select signal to the external memory socket and divides the
external emulation memory into eight independent blocks identical to the PSD3XX.
The three Port C pins are configured for the Memory and I/O signals required by the
specific Microcontroller. All other configuration parameters remain inactive.
In summary, the main function of the ROM Simulator Adapter Board is to allow the use of a
ROM Simulator without any board modification, divide the external memory into eight
blocks identical to the PSD3XX internal EPROM, and enable all other functions of the
System PSD3XX to operate in a normal mode.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PSD3-120 | 制造商:Tamura Corporation of America 功能描述: |
| PSD3121212 | 制造商:TDK-Lambda Corporation 功能描述:DC/DC PS DUAL-OUT 12V/-12V 0.13A/-0.13A 3W 7PIN - Bulk |
| PSD3-12-1212 | 功能描述:DC/DC轉(zhuǎn)換器 3W 12V 0.125A RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| PSD3121212/S | 制造商:TDK-Lambda Corporation 功能描述:DC/DC PS DUAL-OUT 12V/-12V 0.13A/-0.13A 3W 7PIN - Bulk |
| PSD3-12-1212/S | 功能描述:DC/DC轉(zhuǎn)換器 3W 12V 0.125A RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
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