Universal serial bus to parallel bus signal converter and method of conversion

• US 6,040,792 A
• Filed: 11/19/1997
• Issued: 03/21/2000
• Est. Priority Date: 11/19/1997
• Status: Expired due to Term

• Current Assignee: Monterey Research, LLC (Vector Capital Corporation)
• Original Assignee: In-System Design Incorporated (Infineon Technologies AG)
• Inventors: Luke, David D., Gilbert, David C., Watson, Lynn R., Castleberry, James E.
• Primary Examiner(s): Hoff, Marc S.
• Assistant Examiner(s): JEAN PIERRE, PEGUY
• Application Number:
  US08/974,736
• Time in Patent Office: 853 Days
• Field of Search: 341/100, 341/101, 341/106, 395/200.31, 395/200.48, 395/891, 395/282, 395/285
• US Class Current: 341/100
• CPC Class Codes: H03M 9/00 Parallel/series conversion or vice versa digital stores in which the information is moved stepwise per se G11C19/00

Abstract

A serial to parallel port signal converter for interconnection between a hosts utilizing Uniform Serial Bus communications protocols and a peripheral device uses IEEE 1284 complaint communications protocol. The signal converter appears to the host as a fully compliant bi-directional USB device, and to the peripheral device as a fully compliant IEEE 1284 host.

Claims

1. A signal converter, for converting a serial bit stream of data, including command data, interrupt request data and data packets, encoded in a Uniform Serial Bus communications protocol, from a host, into data encoded in a communications protocol compliant with IEEE 1284 specifications for retransmission to a parallel port, which comprises:

means for receiving a serial bit stream of data from a host in a Uniform Serial Bus communications protocol;

means for extracting data bytes from the serial bit stream of data from the Uniform Serial Bus communications protocol; and

means for transmitting the data bytes in a communications protocol which complies with an IEEE 1284 specifications communications protocol to a parallel port.

2. The signal converter of claim 1 which further comprises:

a memory storing IEEE 1284 specifications information and Uniform Serial Bus specifications information for communications protocols; and

a circuit for converting data bytes received in a Uniform Serial Bus communications protocols into comparable data bytes of a communications protocol which complies with the specifications for the IEEE 1284 communications protocol stored in said memory.

3. The signal converter of claim 1 which further comprises:

a memory storing IEEE 1284 specifications information for a plurality of communications protocols in an hierarchical order and Uniform Serial Bus specifications information for communications protocols; and

a circuit for converting data bytes received in an Uniform Serial Bus communications protocol into comparable data bytes in all of the IEEE 1284 communications protocols stored in said memory.

4. The signal converter of claim 3 which further comprises:

a logic circuit for determining in which hierarchical order converted data bytes of the plurality of IEEE 1284 communications protocols are transmitted to said parallel port.

5. The signal converter of claim 1 wherein said means for extracting data bytes from the serial bit stream of data from the Uniform Serial Bus communications protocol further comprises:

a serial register for converting the serial bit stream of data from the host in a Uniform Serial Bus communications protocol to data bytes;

a circuit for identifying whether said data bytes are command data bytes, interrupt request data bytes or data packet bytes;

a circuit for converting command data bytes from the Uniform Serial Bus communications protocol into comparable command data bytes in an IEEE 1284 specifications communications protocol;

a circuit for converting interrupt request data bytes from the Uniform Serial Bus communications protocol into interrupt request data bytes in an IEEE 1284 specifications communications protocol; and

a circuit for converting data packet bytes from the Uniform Serial Bus communications protocol into data packet bytes in an IEEE 1284 specifications communications protocol.

6. A signal converter, for transmitting and receiving a serial bit stream of data, encoded in a Uniform Serial Bus communications protocol to and from a host, and for transmitting and receiving data bytes encoded in a communications protocol compliant with IEEE 1284 specifications to and from a peripheral device, which comprises:

means for transmitting to, and receiving from, said host a serial bit stream of data in a Uniform Serial Bus communications protocol;

means for transmitting to, and receiving from, said peripheral device a stream of data bytes in a communications protocol compliant with IEEE 1284 specifications;

means for extracting data bytes from the serial bit stream of data received from said host in the Uniform Serial Bus communications protocol;

means for converting said extracted data bytes of data into data bytes in a communications protocol compliant with IEEE 1284 specifications; and

means for converting said data bytes in a communications protocol compliant with IEEE 1284 specifications received from the peripheral device into a serial bit stream of data in a Uniform Serial Bus communications protocol.

7. The signal converter of claim 6 which further comprises:

a memory storing specifications and information for a communications protocol compliant with an IEEE 1284 specifications and a communications protocol compliant with Uniform Serial Bus specifications; and

a logic circuit for using said stored specifications and information for converting data received in both IEEE 1284 and Uniform Serial Bus communications protocols into comparable data bytes of the other communications protocol.

8. The signal converter of claim 6 which further comprises:

a memory storing specifications and information for a plurality communications protocols compliant with an IEEE 1284 specifications in a hierarchical order and at least one communications protocol compliant with Uniform Serial Bus specifications; and

a logic circuit for using said stored specifications and information for converting data received in both IEEE 1284 and Uniform Serial Bus communications protocols into comparable data bytes of all of the other communications protocols.

9. The signal converter of claim 8 which further comprises:

a logic circuit for determining in which hierarchical order converted data bytes of the plurality of IEEE 1284 communications protocols are transmitted to said peripheral device.

10. The signal converter of claim 8 which further comprises:

a logic circuit for ascertaining which communications protocols compliant with IEEE 1284 specifications said peripheral device is capable of using; and

a logic circuit for determining in which hierarchical order converted data bytes of the plurality of IEEE 1284 communications protocols are to be used when transmitting data to, and receiving data from, said peripheral device; and

a circuit for selecting for use the highest communications protocol compliant with IEEE 1284 specifications from said hierarchical order that said peripheral device is capable of using.

11. A signal converter, for interconnection between a host device which sends and receives data encoded in a Uniform Serial Bus communications protocol, and a peripheral device which sends and receives data encoded in a communications protocol compliant with IEEE 1284 specifications, which comprises:

means for sending and receiving a serial bit stream of data to and from the host in a Uniform Serial Bus communications protocol;

means for converting data received from the host in a Uniform Serial Bus communications protocol into data encoded in a communications protocol compliant with IEEE 1284 specifications for retransmission to a peripheral device;

means for converting data received data from a peripheral device encoded in a communications protocol compliant with IEEE 1284 specifications into data encoded in a Uniform Serial Bus communications protocol for retransmission to the host; and

means for sending and receiving bytes of data to and from the peripheral device.

12. The signal converter of claim 11 which further comprises:

a memory storing specifications and information for a communications protocol compliant with an IEEE 1284 specifications and a communications protocol compliant with Uniform Serial Bus specifications; and

a logic circuit for using said stored specifications and information for converting data received in both IEEE 1284 and Uniform Serial Bus communications protocols into comparable data bytes of the other communications protocol.

13. The signal converter of claim 11 which further comprises:

a memory storing specifications and information for a plurality communications protocols compliant with an IEEE 1284 specifications in a hierarchical order and at least one communications protocol compliant with Uniform Serial Bus specifications; and

a logic circuit for using said stored specifications and information for converting data received in both IEEE 1284 and Uniform Serial Bus communications protocols into comparable data bytes of all of the other communications protocols.

14. The signal converter of claim 13 which further comprises:

a logic circuit for determining in which hierarchical order converted data bytes of the plurality of IEEE 1284 communications protocols are transmitted to said peripheral device.

15. The signal converter of claim 13 which further comprises:

a logic circuit for ascertaining which communications protocols compliant with IEEE 1284 specifications said peripheral device is capable of using; and

a logic circuit for determining in which hierarchical order converted data bytes of the plurality of IEEE 1284 communications protocols are to be used when transmitting data to, and receiving data from, said peripheral device; and

a circuit for selecting for use the highest communications protocol compliant with IEEE 1284 specifications from said hierarchical order that said peripheral device is capable of using.

16. Using a signal converter, a method of interconnecting a host device which sends data encoded in a Uniform Serial Bus communications protocol, and a peripheral device which receives data encoded in a communications protocol compliant with IEEE 1284 specifications, which comprises:

operatively connecting the signal converter to both the host device and the peripheral device;

receiving a serial bit stream of data from the host device in a Uniform Serial Bus communications protocol;

converting the data in the signal converter received from the host device in a Uniform Serial Bus communications protocol into data encoded in a communications protocol compliant with IEEE 1284 specifications for retransmission to the peripheral device; and

retransmitting the converted data to the peripheral device.

17. Using a signal converter, a method of interconnecting a host device which sends and receives data encoded in a Uniform Serial Bus communications protocol, and a peripheral device which sends and receives data encoded in a communications protocol compliant with IEEE 1284 specifications, which comprises:

operatively connecting the signal converter to both the host device and the peripheral device;

receiving a serial bit stream of data from the host device in a Uniform Serial Bus communications protocol;

converting the data, in the signal converter, received from the host device in a Uniform Serial Bus communications protocol into data encoded in a communications protocol compliant with IEEE 1284 specifications for retransmission to the peripheral device;

retransmitting the converted data to the peripheral device;

receiving data from the peripheral device encoded in a communications protocol compliant with IEEE 1284 specifications;

converting the data, in the signal converter, received from the peripheral device encoded in a communications protocol compliant with IEEE 1284 specifications, into data encoded in the Uniform Serial Bus communications protocol for retransmission to the host device; and

retransmitting the data converted to be data encoded in the Uniform Serial Bus communications protocol to the host device.

18. The method of claim 17 which further comprises:

storing specifications and information for a communications protocol compliant with an IEEE 1284 specifications and a communications protocol compliant with Uniform Serial Bus specifications; and

using said stored specifications and information for converting data received in both IEEE 1284 and Uniform Serial Bus communications protocols into comparable data bytes of the other communications protocol.

19. The method of claim 17 which further comprises:

storing specifications and information for a plurality communications protocols compliant with an IEEE 1284 specifications in a hierarchical order and at least one communications protocol compliant with Uniform Serial Bus specifications; and

using said stored specifications and information for converting data received in both IEEE 1284 and Uniform Serial Bus communications protocols into comparable data bytes of all of the other communications protocols.

20. The method of claim 19 which further comprises:

determining in which hierarchical order converted data bytes of the plurality of IEEE 1284 communications protocols are transmitted to said peripheral device.

21. The method of claim 19 which further comprises:

ascertaining which communications protocols compliant with IEEE 1284 specifications said peripheral device is capable of using; and

determining in which hierarchical order converted data bytes of the plurality of IEEE 1284 communications protocols are to be used when transmitting data to, and receiving data from, said peripheral device; and

selecting for use the highest communications protocol compliant with IEEE 1284 specifications from said hierarchical order that said peripheral device is capable of using.