Re: Interest in AVR+MSP430 "general purpose" proto board?

larwe wrote:
On Apr 19, 4:48 am, Clifford Heath <n...@xxxxxxxxxxxxxxx> wrote:
Nice idea, BTW. Would be nice with a CPLD as Jim suggested.


All right, all right, what is with the CPLD? CPLD talk is not going to
make it into my book, but just supposing I were to add it to this
board, how would you want it wired? All the pins coming to headers, or
half the I/Os going to a micro and the other half to a header?

OK, here is one suggestion:

Wire 4 CPLD pins to the uC(s), as SPI
SPI_DI
SPI_DO
SPI_SS
SPI_CK

and some of the others can go to pin headers,
- you can work out from their names, what they
are used for, and some header candidates :)



Pin Name Resource/Direction
43 on LCD_RWn Dge--
44 on LCD_RS Dge--
1 -- TDI INPUT
2 PT DB6 Dge--
3 PT DB5 Dge--
5 PT DB7 Dge--
6 PT DB4 Dge--
7 -- TMS INPUT
8 PT DB1 Dge--
10 PT DB3 Dge--
11 PT DB2 Dge--
12 PT DB0 Dge--
13 on LCD_E Tg-g-
14 -- SPI_DI INPUT
15 on SPI_DO C----
32 -- TDO C----
26 -- TCK INPUT
39 SPI_SS INPUT << Locked Pin
37 SPI_CK INPUT << Locked Pin

Spares could go to backlight, and buttons - depends on
board space really.

and the programming pin header - IDC10


IDC10 CPLD pin
--------+-----------------------
JTAG.1 S PIN26_C62_TCK_B
JTAG.2 S GND
JTAG.3 S PIN32_C73_TDO
JTAG.4 S VCCIO
JTAG.5 S PIN7_C15_TMS_B
JTAG.6 E PIN40_C90_GCLK2B
JTAG.7 E PIN39_C89_GCLRB
JTAG.8 E PIN37_C87_GCLK1B
JTAG.9 S PIN1_C4_TDI_B
JTAG.10 E GND_OR_VCCINT Jumper Selected. Allows JTAG unlock, Some PCBs GND.10


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