Parallel Port
The Parallel Port is connected to two major components, the USB Port and a PLD that is used to
create and manage much of the dspstak’s I/O ports. In addition, the Parallel Port is brought out to a
30 pin 2mm female dual row header (JH2).
You can use JH2 to expand to your own Parallel Port devices provided you consider a few simple
points. They are as follows:
•
The port can be configured for either 8 bit or 16 bit operation but AD15 must select a low
address (A23 or A15 = 0)
•
A low profile board will fit between the dspstak 21262sx and an I/O Module.
•
A special 2mm male header can be used to connect from a dspstak I/O Module to JH2 but
there is no guarantee that another dspstak DSP Engine will be compatible. Samtec is a
supplier for this type of connector.
JH2 Pinout
Pin Name
Pin Name
Pin Name
1 GND
11 AD1
21 AD11
2 GND
12 AD0
22 AD10
3 Vd+3.3
13 #WR
23 AD9
4 Vd+3.3
14 #RD
24 AD8
5 AD7
15 #RESET
25 GND
6 AD6
16 ALE
26 CLKOUT
7 AD5
17 AD15
27 Vd+3.3
8 AD4
18 AD14
28 Vd+3.3
9 AD3
19 AD13
29 GND
10 AD2
20 AD12
30 GND
The two onboard components, the USB port and the PLD are both mapped into the upper address
space of the Parallel Port. These devices assume that the interface is configured as a 16 bit data bus.
The memory map and details on using these peripherals are covered in the USB & PLD Registers
section of this manual.
dspstak™ 21262sx User Manual
Page 13
