PC-414A ETC, PC-414A Datasheet - Page 10

• Manufacturer Part Number: PC-414A
• Description: Last Time Buy Notice Board Products
• Manufacturer: ETC

PC-414
DATEL, Inc., Mansfield, MA 02048 (USA)
I/O Register Mapping
The base address may be selected anywhere up to 3F0h on
16-byte boundaries.
Transfer Speeds
ISA bus transfer rates are host-dependent and should be
determined by testing. For example, a Compaq computer
achieved 800 nanoseconds instantaneous sample-to-sample
timing to base memory using the REP INSW instruction. A
faster CPU will not increase the ISA bus speed. To optimize
throughput, disable all possible interrupts. For higher speed
continuous (non-stop) A/D sampling, consider using a parallel
port.
I/O Address
Base + 0
Base + 0
Base + 2
Base + 2
Base + 4
Base + 6
Base + 6
Base +8
Base + 0Ah
Base + 0Ch
Base + 0Eh
(hex)
[BASE + 0 bit 2 = 1]
Write
Read
Write
Read
Write
Write
Read
Read/Write
Read/Write
Read/Write
Read/Write
Direction
SSH (Internal)
(414A only)
CONVERT
TRIGGER
ACQUIRE
(Internal
END OF
(Signal)
START
SCAN*
FLAG
A/D
Counter #1 (82C54)
Counter #2 (82C54)
Control Register (82C54)
Command Register
Status Register
Channel Address/Digital
Output [Note 12]
Digital Input Register
[Note 12]
D/A Data Register
FIFO Reset Register
FIFO A/D Data Register
Counter #0 (82C54)
SAMPLE
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HOLD
Description
Maskable Interrupt
0
Figure 4. PC-414 Timing DIagram
and Status
1
2
Internal or external start rate
3
86
FIFO Data Format
A/D data is delivered as a stream from the FIFO memory. For
multichannel inputs, this means that data is multiplexed. For
example, for 4-channel inputs, the output channel sequence is
0, 1, 2, 3, 0, 1, . . . Some applications may need this data de-
multiplexed by software so that each channel’s data is placed
in its own separate buffer.
Fixed or sequential channel addressing up to
64k samples per trigger
Analog
Inputs
PC-414
CPU
MUX
Internal or external trigger rate
A/D
Controller
Controller
Display
Figure 3. Array Preprocessing
Disk
FIFO
MEM
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PC/AT Bus
Binary A/D Data
Parallel
Port
DSP Arrays
Processor
Mass Storage
Array
Board
Graphics
Display
®
See model PC-414COM
using a DSP COMM
port interface.
Internet: www.datel.com
®