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參數(shù)資料
| 型號(hào)： | (Z)PSD813F3R |
| 英文描述： | Multi-Chip-Module to Monolithic Flash PSD(閃速，在系統(tǒng)可編程微控制器外圍器件，0M位閃速存儲(chǔ)器，無SRAM) |
| 中文描述： | 多芯片模塊的單片閃存部門司（閃速，在系統(tǒng)可編程微控制器外圍器件，分位閃速存儲(chǔ)器，無靜態(tài)存儲(chǔ)器） |
| 文件頁數(shù)： | 10/38頁 |
| 文件大?。?/td> | 509K |
| 代理商： | (Z)PSD813F3R |
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PSD GPLD Primer - PSD6XX/7XX/8XX é Application Note
055
WSi Inc. Fremont CA 800-832-6974 www.wsipsd.com
10
The sample design in Appendix A illustrates how to use four of the five possible pin drive sources all on
the same port. You will get an idea of the PSDabel statements that are required as well as the necessary
steps to be taken at run time. The sample design specifies Port A as follows:
Port A
pin
PA7
Function/Mode
Control
bit
0
Direction
bit
1
0
1
Drive
bit
1
3
0
3
MCU I/O OUT, OPEN DRAIN
PA6
MCU I/O BI-DIRECTIONAL
0
PA5
MCU I/O INPUT
0
0
X
2
0
3
0
3
1
4
PA4
GPLD OUT, COMBINATORIAL
X
PA3
EXT CHIP SEL, HIGH SLEW
RATE
ADDRESS OUT, A2
X
1
PA2
1
1
0
4
PA1
ADDRESS OUT, A1
1
1
0
4
PA0
ADDRESS OUT, A0
1
1
0
4
Table 1 - Port A Configuration of Sample Design
Notes:
1.
0 = input, 1 = output
2.
Direction bit from MCU will have an effect if the PSDabel *.oe equation does not force output at
all times; see OR gate in Figure 3.
3.
For PA7-PA4, 1 = Open drain, 0 = Conventional CMOS
4.
For PA3-PA0, 1 = Fast rise time, 0 = Normal rise time
Related facts:
←
At reset, all I/O port control registers are cleared. This means that initially, the port pins are
all MCU I/O mode inputs by default.
←
It is usually best not to assign pin numbers to signal names in the PSDabel file. This allows
the fitter utility to find the best solution. However, pin numbers were assigned in the sample
design file to force functions on certain pins for illustrative purposes.
The following sections were written in cookbook fashion to provide an easy reference for the user.
2.2.3.1 MCU I/O Mode
Run time control of pins.
Do this in the PSDabel file:
Enter pin declarations in the PSDabel file for signals 'Control', 'In_Out', and 'Status' to reserve the port
pins from being consumed by the fitter so they are available to the MCU at run time. See Appendix A,
lines 52, 53, and 54. No equations are needed.
Note: Two of the pins are being used for outputs, PA7 and PA6. No output equations in PSDabel are
allowed for the signals on pins PA7 and PA6 since the equations would require an OMC to drive the pin,
overriding MCU I/O mode. Optionally, input equations are allowed for the signals on pins PA7, PA6, and
PA5 for use as inputs to the AND array (pin feedback). This will not affect MCU I/O mode since the
signals will be routed through IMCs (see IMC section and Figure 2).
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