Electrical computers and digital data processing systems: input/ – Input/output data processing – Input/output command process
Reexamination Certificate
1998-02-12
2001-09-18
Lee, Thomas (Department: 2182)
Electrical computers and digital data processing systems: input/
Input/output data processing
Input/output command process
C710S009000, C710S022000, C709S209000, C370S232000, C341S089000
Reexamination Certificate
active
06292844
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to the field of writing data to and reading data from a media storage device. More particularly, the present invention relates to the field of manipulating the data read from or written to a media storage device.
BACKGROUND OF THE INVENTION
The IEEE 1394-1995 standard, “1394 Standard For A High Performance Serial Bus,” is an international standard for implementing an inexpensive high-speed serial bus architecture which supports both asynchronous and isochronous format data transfers. In addition, the IEEE 1394-1995 bus has a universal clock called the cycle timer. This clock is synchronized on all nodes. Isochronous data transfers are real-time transfers which take place based on the universal clock such that the time intervals between significant instances have the same duration at both the transmitting and receiving applications. Each packet of data transferred isochronously is transferred in its own time period. An example of an ideal application for the transfer of data isochronously would be from a video recorder to a television set. The video recorder records images and sounds and saves the data in discrete chunks or packets. The video recorder then transfers each packet, representing the image and sound recorded over a limited time period, during that time period, for display by the television set. The IEEE 1394-1995 standard bus architecture provides multiple independent channels for isochronous data transfer between applications. A six bit channel number is broadcast with the data to ensure reception by the appropriate application. This allows multiple applications to simultaneously transmit isochronous data across the bus structure. Asynchronous transfers are traditional reliable data transfer operations which take place as soon as arbitration is won and transfer a maximum amount of data from a source to a destination.
The IEEE 1394-1995 standard provides a high-speed serial bus for interconnecting digital devices thereby providing a universal I/O connection. The IEEE 1394-1995 standard defines a digital interface for the applications thereby eliminating the need for an application to convert digital data to analog data before it is transmitted across the bus. Correspondingly, a receiving application will receive digital data from the bus, not analog data, and will therefore not be required to convert analog data to digital data. The cable required by the IEEE 1394-1995 standard is very thin in size compared to other bulkier cables used to connect such devices in other connection schemes. Devices can be added and removed from an IEEE 1394-1995 bus while the bus is operational. If a device is so added or removed the bus will then automatically reconfigure itself for transmitting data between the then existing nodes. A node is considered a logical entity with a unique address on the bus structure. Each node provides in a standard address space, an identification ROM, a standardized set of control registers and in addition, its own address space.
The IEEE 1394-1995 standard defines a protocol as illustrated in FIG.
1
. This protocol includes a serial bus management block
10
coupled to a transaction layer
12
, a link layer
14
and a physical layer
16
. The physical layer
16
provides the electrical and mechanical connection between a device and the IEEE 1394-1995 cable. The physical layer
16
also provides arbitration to ensure that all devices coupled to the IEEE 1394-1995 bus have arbitrated access to the bus as well as actual data transmission and reception. The link layer
14
provides data packet delivery service for both asynchronous and isochronous data packet transport. This supports both asynchronous data transport, using an acknowledgement protocol, and isochronous data transport, providing an un-acknowledged real-time guaranteed bandwidth protocol for just-in-time data delivery. The transaction layer
12
supports the commands necessary to complete asynchronous data transfers, including read, write and lock. The serial bus management block
10
contains an isochronous resource manager for managing isochronous data transfers. The serial bus management block
10
also provides overall configuration control of the serial bus in the form of optimizing arbitration timing, guarantee of adequate electrical power for all devices on the bus, assignment of the cycle master, assignment of isochronous channel and bandwidth resources and basic notification of errors.
A hard disk drive including an IEEE 1394-1995 serial bus interface is illustrated in FIG.
2
. The hard disk drive
20
includes the IEEE 1394-1995 serial bus interface circuit
22
for interfacing to an IEEE 1394-1995 serial bus network. The interface circuit
22
is coupled to a buffer controller
24
. The buffer controller
24
is coupled to a random access memory (RAM)
26
and to a read/write channel circuit
28
. The read/write channel circuit
28
is coupled to the media
30
on which data is stored within the hard disk drive
20
. The read/write channel circuit
28
controls the storage operations on the media
30
, including reading data from the media
30
and writing data to the media
30
.
During a write operation to the hard disk drive
20
, a stream of data is received from a device coupled to the IEEE 1394-1995 serial bus structure by the IEEE 1394-1995 interface circuit
22
. This stream of data is forwarded from the IEEE 1394-1995 interface circuit
22
to the buffer controller
24
. The buffer controller
24
then stores this data temporarily in a buffer in the RAM
26
. When the read/write channel circuit
28
is available, the buffer controller
24
reads the data from the RAM
26
and forwards it to the read/write channel circuit
28
. The read/write channel circuit
28
then writes the data onto the media
30
.
During a read operation from the hard disk drive
20
, a stream of data is read from the media
30
by the read/write channel circuit
28
. This stream of data is forwarded by the read/write channel circuit
28
to the buffer controller
24
. The buffer controller
24
then stores this data temporarily in a buffer in the RAM
26
. When the IEEE 1394-1995 serial bus interface circuit
22
is available, the buffer controller
24
reads the data from the RAM
26
and forwards it to the interface circuit
22
. The IEEE 1394-1995 serial bus interface circuit
22
then formats the data according to the requirements of the IEEE 1394-1995 standard and transmits this data to the appropriate device or devices over the IEEE 1394-1995 serial bus.
A traditional hard disk drive
20
, as described, records data and plays it back according to commands received from an external controller using a protocol such as the serial bus protocol (SBP). The external controller provides command data structures to the hard disk drive
20
which inform the hard disk drive
20
where on the media
30
the data is to be written, in the case of a write operation, or read from, in the case of a read operation. The function of the hard disk drive
20
during a read operation is to recreate the original, unmodified stream of data which was previously written on the media
30
.
With the growing use of the IEEE 1394-1995 serial bus, personal computers are now being coupled together in IEEE 1394-1995 networks with devices which have not traditionally been coupled to personal computers. Examples of such devices are consumer electronic devices such as video cassette recorders, video camcorders, digital video disk players and compact disk players. Raw data from these consumer devices is not always directly usable by a personal computer. The typical solution to this problem is to write an application software program which will run on the personal computer and perform the necessary data manipulation to transform the data into a format which is useful to other applications being run by the personal computer.
What is needed is a filtering device which can be used to manipulate the data from a consumer device into a format required by a personal computer or other de
Fairman Bruce
Smyers Scott
Haverstock & Owens LLP
Lee Thomas
Peyton Tammara
Sony Corporation
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