Communication system, communication system control method, and program

Patent metadata

Field	Value
Publication number	US-9727506-B2
Application number	US-201615063992-A
Country	US
Kind code	B2
Filing date	Mar 8, 2016
Priority date	Oct 1, 2015
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

Communication systems and communication control methods are disclosed. In one example, a slave device belonging to a group of devices to which arbitration is applicable sequentially transmits a start bit and a first address including a first bit having a value different from a corresponding first bit of predetermined pattern data. A master device sequentially transmits the start bit and the predetermined pattern data. The master device arbitrates the master device and the first slave device based on the value of the first bit.

First claim

What is claimed is:

1. A communication system comprising:
a first slave device configured to transmit and receive data, the first slave device belonging to a group of devices for which arbitration is applicable and being configured to sequentially transmit a start bit indicating communication start and a first address including a first bit having a value different from a corresponding first bit of predetermined pattern data; and
a master device configured to sequentially transmit the start bit and the predetermined pattern data,
wherein the master device arbitrates the master device and the first slave device based on the value of the first bit,
wherein the first bit is transmitted according to an open drain circuit mode, and
wherein in the absence of collision being detected in connection with the first bit, at least a second bit is transmitted according to a push-pull circuit mode.

2. The communication system according to claim 1 , further comprising:
a second slave device configured to receive a second address in which a specific value is set in a first bit after the start bit and the predetermined pattern data are sequentially received, and transmit and receive data.

3. The communication system according to claim 2 ,
wherein the second slave device transmits an acknowledgment after the start bit and the predetermined pattern data are sequentially received, receives a restart condition indicating communication restart, and receives the second address.

4. The communication system according to claim 1 , wherein transmitting the first bit according to the open drain circuit mode is at a first communication rate, and transmitting the second bit according to the push-pull circuit mode is at a second communication rate, the second communication rate being higher than the first communication rate.

5. A communication system comprising:
a first slave device configured to transmit and receive data, the first slave device belonging to a group of devices for which arbitration is applicable and being configured to sequentially transmit a start bit indicating communication start and a first address including a first bit having a value different from a corresponding first bit of predetermined pattern data
a master device configured to sequentially transmit the start bit and the predetermined pattern data,
wherein the master device arbitrates the master device and the first slave device based on the value of the first bit; and
a second slave device configured to receive a second address in which a specific value is set in a first bit after the start bit and the predetermined pattern data are sequentially received, and transmit and receive data,
wherein the first slave device stores a setting information indicating inclusion in the group of devices for which arbitration is applicable,
wherein the second slave device stores the setting information indicating inclusion in a second group of devices for which arbitration is not applicable, and
wherein the master device allocates the first address to the first slave device and allocates the second address to the second slave device based on the setting information.

6. The communication system according to claim 5 ,
wherein the first slave device stores the setting information in a first bus characteristic register, and wherein the second slave device stores the setting information in a second bus characteristic register.

7. A communication system comprising:
a master device configured to sequentially transmit a start bit indicating communication start and predetermined pattern data, and transmit and receive data; and
a first slave device configured to perform an in-band interrupt request, a secondary master request, or a peer to peer slave request,
wherein the first slave device sequentially transmits the start bit and a first address including a first bit having a value different from a corresponding first bit of the predetermined pattern data, and transmits and receives data, and
wherein the master device arbitrates the master device and the first slave device based on the value of the first bit,
wherein the first bit is transmitted according to an open drain circuit mode, and
wherein in the absence of collision being detected in connection with the first bit, at least a second bit is transmitted according to a push-pull circuit mode.

8. The communication system according to claim 7 , further comprising:
a second slave device that does not perform any of the in-band interrupt request, the secondary master request, and the peer to peer slave request,
wherein the second slave device receives a second address in which a specific value is set in a first bit after the start bit and the predetermined pattern data are sequentially received, and transmits and receives data.

9. The communication system according to claim 8 ,
wherein the second slave device transmits an acknowledgment after the start bit and the predetermined pattern data are sequentially received, receives a restart condition indicating communication restart, and then receives an address, and when the received address matches an address of the second slave device allocated from a master, transmits an acknowledgment, and then performs reception of write data transmitted from the master device or transmission of read data to the master device, and
wherein the first slave device transmits an acknowledgment after the start bit and the predetermined pattern data are sequentially received when any of the in-band interrupt request, the secondary master request, and the peer to peer slave request is not performed, receives the restart condition, and then receives an address, and when the received address matches an address of the first slave device allocated from the master device, transmits an acknowledgment and then performs reception of write data transmitted from the master device or transmission of read data to the master device.

10. The communication system according to claim 7 , wherein transmitting the first bit according to the open drain circuit mode is at a first communication rate, and transmitting the second bit according to the push-pull circuit mode is at a second communication rate, the second communication rate being higher than the first communication rate.

11. A communication system comprising:
a master device configured to sequentially transmit a start bit indicating communication start and predetermined pattern data, and transmit and receive data;
a first slave device configured to perform an in-band interrupt request, a secondary master request, or a peer to peer slave request,
wherein the first slave device sequentially transmits the start bit and a first address including a first bit having a value different from a corresponding first bit of the predetermined pattern data, and transmits and receives data, and
wherein the master device arbitrates the master device and the first slave device based on the value of the first bit; and
a second slave device that does not perform any of the in-band interrupt request, the secondary master request, and the peer to peer slave request,
wherein the second slave device receives a second address in which a specific value is set in a first bit after the start bit and the predetermined pattern data are sequentially received, and transmits and receives data,
wherein the first slave device stores a setting information indicating inclusion a group for which arbitration is applicable,
wherein the second slave device stores the setting information indicating inclusion in a second group for which arbitration is not applicable, and
wherein the master device allocates the first address to the first slave device and allocates

Assignees

• Sony Corp

Inventors

• Takahashi Hiroo
• Koshisaka Naohiro
• Lee Sonfun

Classifications

• G06F13/4291 Primary

  using a clocked protocol · CPC title

• G06F13/4282

  on a serial bus, e.g. I2C bus, SPI bus (on daisy chain buses G06F13/4247) · CPC title

• G06F13/364 Primary

  using independent requests or grants, e.g. using separated request and grant lines · CPC title

• G06F13/404

  with address mapping · CPC title

• G06F2213/0052

  Assignment of addresses or identifiers to the modules of a bus system · CPC title