Chapter 3

Hardware

Primary I/O Interface (J3)

The J3 connector has 100 pins and is used for Floppy or Printer port (LPT1), Serial ports (COM1 and COM2) Mouse and Keyboard interfaces, Infrared (IrDA) port, and the video interfaces for standard CRT video and LVDS ports.

Floppy Port

The floppy interface shares signal lines with the Parallel interface. The BIOS settings determine which one is operational. A standard 34-pin floppy drive connector is listed in Table 3-16 for reference along with the J3 connector pins. This type of connector can be located on the custom baseboard if desired.

•Supports only one floppy drive on floppy drive B

•16 bytes of FIFO

•Data rate up to 1 Mbps

Table 3-16. Simplified Floppy Drive Interface Pin/Signal Descriptions (J3)

J3

Signal

34-Pin

Description

Pin #

 

Cable

 

51

LPT/FLPY*

NC

Parallel/Floppy Select – This input signal selects the parallel or

 

 

 

floppy port signal. If this signal is Low at boot time, the floppy

 

 

 

drive is selected. If signal is High at boot time, the parallel port is

 

 

 

selected. This state can not be changed until the next boot cycle.

56

DENSEL

2

Drive Density Select (Bit 0) – This signal indicates when a low

 

 

 

(250/300kBps) or high (500/1kBps) data rate is selected.

NC

NC

4

NC

 

 

 

 

NC

KEY

6

Key – Not connected

80

INDEX*

8

Index – This signal indicates when head is positioned over the

 

 

 

beginning of a track or index hole.

86

MOT1*

16

Motor Control 1 – Select motor on drive 1.

55

Reserved

14

Reserved (Drive Select 0)

 

 

 

 

84

DRV1*

12

Drive Select 1 – Select drive 1.

 

 

 

 

58

Reserved

10

Reserved (Motor Control 0)

64

DIR*

18

Direction – Direction of head movement (0 = inward motion,

 

 

 

1 = outward motion).

70

STEP*

20

Step – Low pulse for each track-to-track movement of the head.

88

WDATA*

22

Write Data – Encoded data to the drive for write operations.

 

 

 

 

90

WGATE*

24

Write Gate – Signal to the drive to enable current flow in the write

 

 

 

head.

78

TRK0*

26

Track 0 – Sense detects the head is positioned over track 0.

 

 

 

 

76

WP*

28

Write Protect – Senses the diskette is write protected.

 

 

 

 

74

RDATA*

30

Read Data – Raw serial bit stream from the drive for read operations.

60

HDSEL*

32

Head Select – Selects the side for Read/Write operations (0 = side 1,

 

 

 

1 = side 0)

72

DSKCHG*

34

Disk Change – Senses the drive door is open or the diskette has been

 

 

 

changed since the last drive selection.

66

GND

all odd

Ground (1-33)

 

 

 

 

Notes: The shaded area denotes power or ground. The signals marked with * indicate active low.

XTX 820

Reference Manual

35

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Ampro Corporation XTX 820 manual Primary I/O Interface J3, Floppy Port, Signal 34-Pin Description Pin # Cable
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XTX 820 specifications

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Connectivity is another strong suit of the XTX 820. The module comes with multiple I/O interfaces that enhance its utility in various applications. It features USB, Serial, and Parallel ports, along with support for LVDS display and audio interfaces. This diverse range of connectivity options allows the XTX 820 to integrate easily with a variety of systems and devices, facilitating seamless data transfer and communication.

Security is increasingly critical in embedded systems, and Ampro has integrated robust security features into the XTX 820. This includes support for hardware-based security solutions, which can protect sensitive data and prevent unauthorized access. Such characteristics make the module a suitable choice for industries where data integrity is paramount.

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In conclusion, the Ampro Corporation XTX 820 embedded computing module emerges as a versatile platform that combines performance, memory flexibility, robust connectivity, and enhanced security features. Its design is tailored to meet the demands of various industries, making it a reliable choice for developers looking for advanced embedded solutions.
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