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72 Parallel I/O Models
Syntax
IO_0 parallel slave | slave_b | master
io-object-name
;
IO_0
Parallel input/output requires eleven pins and must specify pin IO_0.
Table
29 shows how the pins are used.
Table 29. Pins for Parallel I/O Object
Pin Master Slave A Slave B
IO_0 thru IO_7 Data Bus Data Bus Data Bus
IO_8 Chip select
output
Chip select
input
Chip select
input
IO_9 RD/~WR output RD/~WR input RD/~WR input
IO_10 HANDSHAKE
input
HANDSHAKE
input
A0 input
IO_11 N/A N/A IRQ
Note: IO_11 as IRQ is only available for Series 5000 devices.
slave | slave_b | master
Specifies slave A, slave B, or master mode. For master and slave A modes,
IO_10 is a handshake signal. For slave B mode, IO_10 becomes an address
line input, A0, and the handshake signal appears on the data bus on pin IO_0
when A0=1. When A0=0, the data appears on the data bus. This mode is
used to allow a Neuron Chip or Smart Transceiver to reside on a
microprocessor bus with the data at one address location and the handshake
signal at another.
io-object-name
A user-specified name for the I/O object, in the ANSI C format for variable
identifiers.
Usage
struct parallel_io_interface {
unsigned int length;
unsigned int data[
data-size
];
} piofc
;
io_in(
io-object-name
, &piofc);
io_request(
io-object-name
);
io_out(
io-object-name
, &piofc);
- I/O Model Reference for Smart 1
- Transceivers and Neuron Chips 1
- Welcome 3
- Audience 3
- Related Documentation 3
- Mini FX User’s Guide 4
- Series 5000 Chip Data Book 4
- Table of Contents 5
- Introduction 11
- Overview 12
- Direct I/O Models 14
- Parallel I/O Models 14
- Serial I/O Models 15
- Overlaying I/O Objects 18
- I/O Timing Issues 22
- Information 24
- Multiplexing I/O Models 28
- General I/O Functions 28
- Neuron C Reference Guide 29
- I/O Events 31
- Neuron C Programmer’s Guide 31
- Using Functions or Events 35
- Timer/Counter I/O Models 38
- Output Models 39
- Bit Input/Output 42
- Bit Input Example 45
- Bit Output Example 45
- Byte Input/Output 45
- Byte Input Example 47
- Byte Output Example 48
- Leveldetect Input 48
- Nibble Input/Output 50
- Nibble Input Example 53
- Nibble Output Example 53
- Touch Input/Output 53
- Muxbus Input/Output 62
- Parallel Input/Output 65
- Master Program 71
- Slave Program 72
- Slave B Mode 73
- Token Passing 76
- Handshaking 76
- Transferring Data 76
- Resynchronization Procedure 77
- Using the IRQ Signal 80
- Bitshift Input/Output 86
- Bitshift Input Example 90
- Bitshift Output Example 90
- I2C Input/Output 90
- Magcard Bitstream Input 94
- Magcard Input 96
- Magtrack1 Input 99
- Programming Considerations 100
- Syntax 101
- Example 102
- Neurowire Input/Output 102
- Hardware Considerations 102
- Neurowire Master Mode 103
- Neurowire Slave Mode 104
- SCI (UART) Input/Output 108
- Serial Input/Output 113
- Serial Input Example 117
- Serial Output Example 117
- SPI Input/Output 117
- SPI Master 122
- SPI Master (Neurowire 122
- SPI Slave 123
- Wiegand Input 128
- Timer/Counter Input Models 133
- Dualslope Input 135
- Neuron C Resources 138
- Edgelog Input 139
- Infrared Input 144
- Ontime Input 148
- Period Input 151
- Pulsecount Input 155
- Quadrature Input 158
- Totalcount Input 161
- Timer/Counter Output Models 165
- Edgedivide Output 166
- Frequency Output 169
- Infrared Pattern Output 172
- Oneshot Output 175
- Pulsecount Output 178
- Pulsewidth Output 181
- Stretched Triac Output 184
- Triac Output 189
- Example 1 192
- Example 2 193
- Triggered Count Output 193
- Timer/Counter Periods and 197
- Resolution 197
- InputClock 199
- And so on 200
- Period = 201
- Frequency = 1 / 201
- 196 Index 206
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