- 您现在的位置：买卖IC网 > PDF目录224860 > PT7A6526 50V Fast Recovery Diode in a DO-203AB (DO-5) package PDF资料下载
参数资料
| 型号： | PT7A6526 |
| 英文描述： | 50V Fast Recovery Diode in a DO-203AB (DO-5) package |
| 中文描述： | 单通道协议控制器？ |用户手册PT7A6525（6）在中断演示模式？（PDF格式系统） |
| 文件页数： | 37/41页 |
| 文件大小： | 1640K |
| 代理商： | PT7A6526 |
第1页第2页第3页第4页第5页第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页第36页当前第37页第38页第39页第40页第41页
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
5
PT Pericom Technology Inc.
The Demo Board of PT7A6525
in DMA Mode
CPU of the Demo Board
The demo board uses MC68HC000 as its CPU. This
microprocessor is of 16-bit data bus and 20-bit address
bus. These two bus are not multiplexed. The low-order
byte (D0~D7) of the data bus has a odd address, one
count higher than the address of the high-order byte
(D8~D15).
The bus of MC68HC000 is Motorola Bus Mode. But
the system bus is in Intel Bus Mode because the ROM,
RAM, and 8237 all work in Intel Bus Mode. So the
control signals as BR, BG, BGACK, IPL0~2 cannot
connect to DMA controller directly. All these signals
need be adapted by EPLD. They are related to HLDA,
HRQ signals of DMA controller 8237.
The circuit of MC68HC000 is shown in Appendix A,
Schematics 1. This schematic also shows the reset cir-
cuit. The detail of MC68HC000 can be seen in its User’s
Manual and Programmer’s Reference Manual of
MC68HC000.
The supervisor program of the MC68HC000 is stored
in ROM, two AM29F010. This program is a simple
communication routine between the demo board and
the demo program on PC. It only received the read/
write commands from PC via RS232 serial interface
and read/write the data from/to the address defined in
the commands.
To simplify the designment of the peripheral circuit of
MC68HC000 and the supervisor program of micropro-
cessor, the interrupt is not processed by MC68HC000
and the IPL0~2 are not influenced by PT7A6525 INT
output. The status of PT7A6525 is checked by demo
program from ISTA register of PT7A6525.
ROM
The two ROM chips are all 8-bit data bus. To connect
them to 16-bit data bus of MC68HC000, the two chips
works in bit-extended mode. The A1 of address bus is
connected to A0 of ROM chip, and A2 to A1 of ROM
chip, etc. The D0~D7 pins of these two chips are con-
nected to D0~D7 and D8~D15 respectively. The chip-
selected signal is derived from the decoder in EPLD.
The circuit is shown in Appendix A, Schematics 2.
RS232 Serial Interface
The demo board connects to PC via a RS232 Serial
Interface. The connector is a 9-PIN RS232 female con-
nector. The pin definition is as follows:
Pin 2
TxD
Pin 3
RxD
Pin 5
GND
This definition is the same as a DCE.
MC6850 is used to implement parallel-serial transform.
It is a UART interface for MC68HC000. The clock of
serial transmitter and receiver is 16-divided from the
1.544MHz output of PT7A4402.
MAX232A is used as the RS232 level driver and re-
ceiver.
The circuit of the RS232 serial interface is shown in
Appendix A, Schematics 3.
Schematics 3 shows some other peripheral circuits. The
LEDs are used here only as working flags.
RAM
There are two UT6264 chips used in this demo board
as system RAM. These memory chips are of 8-bit data
bus. They are connected to 16-bit data bus in bit-ex-
tended mode. The RAM circuit is shown in Appendix
A, Schematics 2.
The address bus connections are the same as ROM.
One chip connects to low byte (D0~D7) of the data
bus, the other to high byte. These two chips have dif-
ferent chip-select signals. Signal RAML is for the chip
connected to D0~D7 and RAMH for the chip connected
to D8~D15. These two chip-select signal are derived
from EPLD and they are controlled by LDS and UDS
from MC68HC000.
相关PDF资料 |
PDF描述 |
|---|---|
| PT7A6527 | 60V Single N-Channel Hi-Rel MOSFET in a TO-204AE package |
| PT7A7511 | 4.63V Reset Active Low Supervisor? |
| PT7A7512 | 4.38V Reset Active Low Supervisor? |
| PT7A7513 | 3.08V Reset Active Low Supervisor? |
| PT7A7514 | 300V Single N-Channel HEXFET Power MOSFET in a SO-8 package |
相关代理商/技术参数 |
参数描述 |
|---|---|
| PT7A6527 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Quad-channel Protocol Controller? | Demo board Schematic and Program?(PDF) |
| PT7A6632 | 制造商:PERICOM 制造商全称:Pericom Semiconductor Corporation 功能描述:PT7A6632 32-Channel HDLC Controller |
| PT7A6632J | 制造商:PERICOM 制造商全称:Pericom Semiconductor Corporation 功能描述:PT7A6632 32-Channel HDLC Controller |
| PT7A7511 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:4.63V Reset Active Low Supervisor? |
| PT7A7512 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:4.38V Reset Active Low Supervisor? |
发布紧急采购，3分钟左右您将得到回复。