Skip based control logic for first in first out buffer
View Patent ↗Skip based control logic for first in first out buffer is disclosed. In one embodiment, an isochronous data packet placed in an isochronous receive first in first out (IRFIFO) buffer coupled to an isochronous receive direct memory access (IRDMA) is detected. Further, a header of the isochronous data packet is read. Furthermore, a validity of the isochronous data packet is determined. Also, a read operation of remaining data of the isochronous data packet is skipped if the isochronous data packet is determined as invalid.
1. A method for a host controller interface (HCI), comprising:
detecting an isochronous data packet placed in an isochronous receive first in first out (IRFIFO) buffer coupled to an isochronous receive direct memory access (IRDMA);
reading a header of the isochronous data packet;
determining a validity of the isochronous data packet; and
skipping a read operation of remaining data of the isochronous data packet by incrementing a read pointer of the IRFIFO buffer based on a skip parameter of a skip register if the isochronous data packet is determined as invalid, wherein skipping the read operation comprises:
setting a current location of the read pointer to a current location of a write pointer if a value of the skip parameter is greater than zero and a data count of the isochronous data packet.
2. The method of claim 1 , wherein the determining the validity of the isochronous data packet comprises:
extracting a channel number and packet filtering controls from the header; and
comparing the channel number and the packet filtering controls with contents of control registers associated with the IRDMA.
3. A non-transitory machine-readable medium embodying a set of instructions that, when executed by a machine, causes the machine to perform the method of claim 1 .
4. The method of claim 1 , wherein the skip parameter is set to a null value if the isochronous data packet is determined as valid for the read operation.
5. The method of claim 1 , wherein skipping the read operation further comprises:
decreasing the value of the skip parameter by the data count upon setting the current location of the read pointer to the current location of the write pointer; and
setting the data count to zero, wherein the setting the data count to zero further comprises performing another write operation with additional data.
6. The method of claim 5 , further comprising setting the read pointer by increasing the current location of the read pointer by the value of the skip parameter if a size of the additional data is greater than the value of the skip parameter.
7. The method of claim 6 , wherein the increasing the current location of the read pointer by the value of the skip parameter further comprises decreasing the size of the additional data by the value of the skip parameter.
8. The method of claim 1 , wherein skipping the read operation further comprises increasing the current location of the read pointer by the value of the skip parameter if the data count of the isochronous data packet is greater than the value of the skip parameter.
9. The method of claim 8 , wherein the increasing the current location of the read pointer by the value of the skip parameter further comprises decreasing the data count by the value of the skip parameter.