AN1139 STMicroelectronics, AN1139 Datasheet - Page 40

• Manufacturer Part Number: AN1139
• Description: L6254 - L6268 - L6269 12V DISK DRIVE POWER COMBO IC
• Manufacturer: STMicroelectronics

AN1139 APPLICATION NOTE
Figure 23. Smart Power Development System Setup
H W P C I - S T
L 6 2 5 4 / 6 8 / 6 9
Interface Board
B O A R D
The SPDS tool for the devices described in this application note is available through the STMicroelectronics rep-
resentative.
6.3.1 SPDS Hardware
The SPDS hardware consist of two boards, PC interface board (HWPCI-ST) and application board. The inter-
face board provides a programmable interface between the PC and the external devices. Inserted into one PC
ISA expansion slot , the board is memory-mapped: the PC reads/writes the expansion board as a common
memory location.
The interface board contains 4 eight-bit digital ports which can be programmed as outputs and/or inputs; a tim-
ing section consisting of four general purpose counting/timing channels and one programmable rate generator
channel is controlled by one 8MHz on-board crystal clock.
The interface board is connected to the application board (external to the PC) with two flat cables. The applica-
tion board is designed specifically for the devices depicted in this manual and provides all the external compo-
nents necessary to the device itself. The Figure #25 and Figure #26 show the connection between interface and
application boards.
6.3.1.1 Interface Board
The interface card has a switch that defines the PC memory location in which it is allocated. The switch has to
be set at HexCD00 address as explained in the Figure #24.
Figure 24. SPDS Interface Board Memory Address, Dip Switch Setting
O N
O F F
1
2
3
4
5
6
7
8
9
10
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