AD1821 Analog Devices, AD1821 Datasheet - Page 11

• Manufacturer Part Number: AD1821
• Manufacturer: Analog Devices

Parallel Interface (All Outputs are 24 mA Drivers)
Pin Name
PC_D[7:0]
IRQ(x)*
DRQ(x)
PC_A[15:0]
AEN
DACK (x)
IOR
IOW
RESET
Game Port
Pin Name
A_1
A_2
A_X
A_Y
B_1
B_2
B_X
B_Y
MIDI Interface Signal (24 mA Drivers)
Pin Name
MIDI_IN
MIDI_OUT
REV. 0
85–88, 91–94
75–81, 83
72–74
4–19
20
25
50
49
54
53
52
51
56
55
66
67
PQFP
59–61
22
21
PQFP
PQFP
I/O
83–86, 89–92
O
O
I
I
I
I
I
I
I/O
I
I
I
I
I
I
I
I
I/O
I
O
Description
I/O
to the low byte data on the bus.
Host Interrupt Request, 24 mA drive. IRQ (3)/IRQ (9), IRQ(5), IRQ(7),
IRQ(9)/IRQ (14), IRQ(10)/IRQ(4), IRQ(11)/IRQ (9)/IRQ (4), IRQ(12)/
IRQ(13), IRQ(15)/IRQ (11). Active HI signals indicating a pending interrupt.
DMA Request, 24 mA drive. DRQ(0), DRQ(1), DRQ(3). Active HI signals
indicating a request for DMA bus operation.
ISA Bus PC Address. Connects the AD1821 to the ISA bus address lines.
Address Enable. Low signal indicates a PIO transfer.
DMA Acknowledge. DACK(0), DACK(1), DACK(3). Active LO signal
indicating that a DMA operation can begin.
I/O Read. Active LO signal indicates a read operation.
I/O Write. Active HI signal indicates a write operation.
Reset. Active HI.
Description
Game Port A, Button #1.
Game Port A, Button #2.
Game Port A, X-Axis.
Game Port A, Y-Axis.
Game Port B, Button #1.
Game Port B, Button #2.
Game Port B, X-Axis.
Game Port B, Y-Axis.
Description
RXD MIDI Input. This pin is typically connected to Pin 15 of the game
port connector.
TXD MIDI Output. This pin is typically connected to Pin 12 of the game
port connector.
Bidirectional ISA Bus PC Data, 24 mA drive. Connects the AD1821
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AD1821