AN1139 STMicroelectronics, AN1139 Datasheet - Page 41

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

The OUT0 pin of the JC1 jumper must be connected to IRQ5 pin of the JC2 jumper connector. The OUT1 pin
of the JC1 jumper must be connected to IRQ3 pin of the JC2 jumper connector. This will allow the outputs of
the Timer0 and Timer1 to generate an Interrupt request respectively on IRQ5 and IRQ3 lines of the PC interrupt
controller. The TGATE3 pin must be connected to BGATE3 pin of the GATE jumper connector. The TGATE1
pin must be connected to BGATE1 pin of the GATE jumper connector. This setting will allow the application
board to control the counting of the Timer1 and Timer3. The Timer 0 and 2 are enabled by software. The Figure
#25 shows the connectors and jumpers location. Three connectors along with three flat cables interface the In-
terface Board with the external Application Board. Connector C2 carries 16 bits input/output data through two
8 bits port, Port 0 and Port 1. Connector C3 also carries 16 bits input/output data through Port 2 and Port 3.
Each port is configurable by software as input or output. The connector C3 is not utilized in the application of
the devices depicted in this manual.
Connector C4 is the Timer connector and carries the GATE, CLOCK and OUT signal for each of the four Timer
available on board. The Rate Generator output, which is programmable, is also available on Connector C4.
Three 5V supply lines capable of 1A of current each isolated with fuses (Fuse 1, Fuse 2 and Fuse 3) are avail-
able on pin #34 of each cables.
A detailed explanation of the Interface card is available in a separate manual inside the SPDS tool box.
Important!!! The SPDS makes use of the IRQ3 and IRQ5 interrupt lines. If another board inside the PC is using
the same lines, it is necessary to remove it to avoid the Interrupt Hardware conflit .
Figure 25. SPDS Interface Board, Connectors And Jumpers Location
6.3.1.2 Application Board
The application board is connected to the interface board with two flat cables. The Port 0/1 cable, which provides
all the digital input output signals, is connected between Port 1 connector of the application board and connector
C2 of the interface board. The Timer cable, which provides the timings, is connected between Timer Connector
of the application board and connector C4 of the interface board.
Two 5V supply lines available on pin #34 of Port 1 and Timer cables supply some of the Application board ICs.
For this reason, please make sure that the Fuses mounted on the Interface Board are working.
An oscillator running at 20MHz required by the Combo IC is available on board. A different frequency can be
input at the BNC connector. The selection between on board and external frequencies is done by software.
APPLICATION BOARD
TO / FROM
PORT 0/1
PORT 1
PORT 2/3
APPLICATION BOARD
TO / FROM
TIMER
TIMER
JC2
0
0
JC1
BGATE
SGATE
1
1
2
2
3
3
GATES
TO PC ISA BUS SLOT
AN1139 APPLICATION NOTE
O N
OFF
1
DIP SWITCH
2
3
4
5
6
7
8
9 10
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