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也是用ft2232实现的，把jtag，spi，i2c，com等功能全部集成了，而且有电平转换，com口输出ttl和cmos电平
可惜没有电路图，不过看文字说明该大概明白电路了，基本就是标准电路实现
找到原理图在补充吧
cmos电平转换用的是max3243，jtag电平用74LVC16T245
Pin Connections FT2232H | 20 PIN JTAG Header | SPI Header 1 | DB9 Connector | RS232 Level Output Header | TTL Level Output Header | SPI Header 2 | Memo | | ADBUS0 | TCK | SCK |
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| | ADBUS1 | TDI | MOSI |
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| | ADBUS2 | TDO | MISO |
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| | ADBUS3 | TMS | CS |
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| | ADBUS4 | RST |
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| | ADBUS5 | nTRST |
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| | ADBUS6 | DBGRQ |
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| | ADBUS7 | RTCK |
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| | ACBUS0 | DBGACK |
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| | ACBUS1 |
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| Connected to nTRST pin of JTAG Header, (input) | | ACBUS2 |
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| Connected to RST pin of JTAG Header, as (input) | | ACBUS3 |
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| OEN Pin (enable buffer chip), active low (output) | | ACBUS4 |
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| Target present pin. Detect VTAR, active low (input) | | ACBUS5 |
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| | ACBUS6 |
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| | ACBUS7 |
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| | BDBUS0 |
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| TX | TX | TX | SCK |
| | BDBUS1 |
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| RX | RX | RX | MOSI |
| | BDBUS2 |
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| RTS | RTS | RTS | MISO |
| | BDBUS3 |
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| CTS | CTS | CTS | CS |
| | BDBUS4 |
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| DTR | DTR | DTR |
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| | BDBUS5 |
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| DSR | DSR | DSR |
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| | BDBUS6 |
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| DCD | DCD | DCD |
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| | BDBUS7 |
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| RI | RI | RI |
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| | BCBUS0 |
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| | BCBUS1 |
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| | BCBUS2 |
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| | BCBUS3 |
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| RX LED | | BCBUS4 |
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| TX LED | | BCBUS5 |
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| | BCBUS6 |
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| | BCBUS7 |
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| | PWREN |
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| Enable MAX3243. Active low (output) |
TIAO_USB_MPA_DRIVER.rar
(971.65 KB, 下载次数: 14)
TIAO-xc3sprog.rar
(5.08 MB, 下载次数: 16)
data.rar
(1.67 MB, 下载次数: 13)
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雷达卡
发表于 2013-10-13 08:54:21
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发表于 2013-10-13 12:02:45
楼主
辛辛苦苦攒的分啊
