公开(公告)号：US11714754B2

公开(公告)日：2023-08-01

申请号：US17460410

申请日：2021-08-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Abhijeet Ashok Chachad ,  David Matthew Thompson ,  Naveen Bhoria

IPC: G06F12/0811 ,  G06F9/30 ,  G06F9/38 ,  G06F9/46 ,  G06F9/54 ,  G06F11/30 ,  G06F12/0808 ,  G06F12/0815 ,  G06F12/0817 ,  G06F12/0831 ,  G06F12/084 ,  G06F12/0895 ,  G06F12/128 ,  G06F13/16 ,  G06F12/0897

CPC classification number: G06F12/0811 ,  G06F9/30047 ,  G06F9/30079 ,  G06F9/3867 ,  G06F9/467 ,  G06F9/544 ,  G06F9/546 ,  G06F11/3037 ,  G06F12/084 ,  G06F12/0808 ,  G06F12/0815 ,  G06F12/0828 ,  G06F12/0831 ,  G06F12/0895 ,  G06F12/128 ,  G06F13/1668 ,  G06F2212/1021 ,  G06F2212/608

Abstract: An apparatus including a CPU core and a L1 cache subsystem coupled to the CPU core. The L1 cache subsystem includes a L1 main cache, a L1 victim cache, and a L1 controller. The apparatus includes a L2 cache subsystem coupled to the L1 cache subsystem. The L2 cache subsystem includes a L2 main cache, a shadow L1 main cache, a shadow L1 victim cache, and a L2 controller. The L2 controller receives an indication from the L1 controller that a cache line A is being relocated from the L1 main cache to the L1 victim cache; in response to the indication, update the shadow L1 main cache to reflect that the cache line A is no longer located in the L1 main cache; and in response to the indication, update the shadow L1 victim cache to reflect that the cache line A is located in the L1 victim cache.

公开(公告)号：US20230185719A1

公开(公告)日：2023-06-15

申请号：US18167921

申请日：2023-02-13

Applicant: Texas Instruments Incorporated

Inventor： Abhijeet Ashok Chachad ,  Timothy David Anderson ,  Kai Chirca ,  David Matthew Thompson

IPC: G06F12/0842 ,  G06F12/0811 ,  G06F1/14 ,  G06F12/0888 ,  G06F9/54

CPC classification number: G06F12/0842 ,  G06F12/0811 ,  G06F1/14 ,  G06F12/0888 ,  G06F9/544 ,  G06F2212/1016

Abstract: In described examples, a processor system includes a processor core generating memory transactions, a lower level cache memory with a lower memory controller, and a higher level cache memory with a higher memory controller having a memory pipeline. The higher memory controller is connected to the lower memory controller by a bypass path that skips the memory pipeline. The higher memory controller: determines whether a memory transaction is a bypass write, which is a memory write request indicated not to result in a corresponding write being directed to the higher level cache memory; if the memory transaction is determined a bypass write, determines whether a memory transaction that prevents passing is in the memory pipeline; and if no transaction that prevents passing is determined to be in the memory pipeline, sends the memory transaction to the lower memory controller using the bypass path.

公开(公告)号：US11675700B2

公开(公告)日：2023-06-13

申请号：US17666196

申请日：2022-02-07

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Abhijeet Ashok Chachad ,  David Matthew Thompson ,  Timothy David Anderson ,  Kai Chirca

IPC: G06F12/08 ,  G06F12/0811 ,  G06F12/0815 ,  G06F12/128 ,  G06F12/0817 ,  G06F12/084 ,  G06F9/30 ,  G06F11/30 ,  G06F12/0808 ,  G06F13/16 ,  G06F9/38 ,  G06F9/46 ,  G06F9/54 ,  G06F12/0895 ,  G06F12/0831

CPC classification number: G06F12/0811 ,  G06F9/30047 ,  G06F9/30079 ,  G06F9/3867 ,  G06F9/467 ,  G06F9/544 ,  G06F9/546 ,  G06F11/3037 ,  G06F12/084 ,  G06F12/0808 ,  G06F12/0815 ,  G06F12/0828 ,  G06F12/0831 ,  G06F12/0895 ,  G06F12/128 ,  G06F13/1668 ,  G06F2212/1021 ,  G06F2212/608

Abstract: A method includes receiving, by a level two (L2) controller, a first request for a cache line in a shared cache coherence state; mapping, by the L2 controller, the first request to a second request for a cache line in an exclusive cache coherence state; and responding, by the L2 controller, to the second request.

公开(公告)号：US11620236B2

公开(公告)日：2023-04-04

申请号：US17727921

申请日：2022-04-25

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Bipin Prasad Heremagalur Ramaprasad ,  David Matthew Thompson ,  Abhijeet Ashok Chachad ,  Hung Ong

IPC: G06F12/10 ,  G06F12/1045 ,  G06F15/78

Abstract: A system comprises a processor including a CPU core, first and second memory caches, and a memory controller subsystem. The memory controller subsystem speculatively determines a hit or miss condition of a virtual address in the first memory cache and speculatively translates the virtual address to a physical address. Associated with the hit or miss condition and the physical address, the memory controller subsystem configures a status to a valid state. Responsive to receipt of a first indication from the CPU core that no program instructions associated with the virtual address are needed, the memory controller subsystem reconfigures the status to an invalid state and, responsive to receipt of a second indication from the CPU core that a program instruction associated with the virtual address is needed, the memory controller subsystem reconfigures the status back to a valid state.

公开(公告)号：US11567874B2

公开(公告)日：2023-01-31

申请号：US17520805

申请日：2021-11-08

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Bipin Prasad Heremagalur Ramaprasad ,  David Matthew Thompson ,  Abhijeet Ashok Chachad ,  Hung Ong

IPC: G06F12/08 ,  G06F12/0862 ,  G06F9/38 ,  G06F12/0811

Abstract: An apparatus includes a CPU core, a first memory cache with a first line size, and a second memory cache having a second line size larger than the first line size. Each line of the second memory cache includes an upper half and a lower half. A memory controller subsystem is coupled to the CPU core and to the first and second memory caches. Upon a miss in the first memory cache for a first target address, the memory controller subsystem determines that the first target address resulting in the miss maps to the lower half of a line in the second memory cache, retrieves the entire line from the second memory cache, and returns the entire line from the second memory cache to the first memory cache.

公开(公告)号：US20220261360A1

公开(公告)日：2022-08-18

申请号：US17734174

申请日：2022-05-02

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Abhijeet Ashok Chachad ,  David Matthew Thompson

IPC: G06F13/16

Abstract: In described examples, a coherent memory system includes a central processing unit (CPU) and first and second level caches. The memory system can include a pipeline for accessing data stored in one of the caches. Requestors can access the data stored in one of the caches by sending requests at a same time that can be arbitrated by the pipeline.

公开(公告)号：US11314660B2

公开(公告)日：2022-04-26

申请号：US16694751

申请日：2019-11-25

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Bipin Prasad Heremagalur Ramaprasad ,  David Matthew Thompson ,  Abhijeet Ashok Chachad ,  Hung Ong

IPC: G06F12/1045 ,  G06F15/78

Abstract: A system comprises a processor including a CPU core, first and second memory caches, and a memory controller subsystem. The memory controller subsystem speculatively determines a hit or miss condition of a virtual address in the first memory cache and speculatively translates the virtual address to a physical address. Associated with the hit or miss condition and the physical address, the memory controller subsystem configures a status to a valid state. Responsive to receipt of a first indication from the CPU core that no program instructions associated with the virtual address are needed, the memory controller subsystem reconfigures the status to an invalid state and, responsive to receipt of a second indication from the CPU core that a program instruction associated with the virtual address is needed, the memory controller subsystem reconfigures the status back to a valid state.

公开(公告)号：US11249842B2

公开(公告)日：2022-02-15

申请号：US16882372

申请日：2020-05-22

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Abhijeet Ashok Chachad ,  David Matthew Thompson ,  Son Hung Tran

IPC: G06F11/10 ,  H03M13/15 ,  G06F9/38 ,  G06F12/0879 ,  G06F9/30 ,  G06F9/46 ,  G06F9/448 ,  G06F9/48 ,  G06F9/52 ,  G06F12/0811 ,  G06F13/16

Abstract: An apparatus includes a central processing unit (CPU) core and a cache subsystem coupled to the CPU core. The cache subsystem includes a memory configured to store a line of data and an error correcting code (ECC) syndrome associated with the line of data, where the ECC syndrome is calculated based on the line of data and the ECC syndrome is a first type ECC. The cache subsystem also includes a controller configured to, in response to a request from a master configured to implement a second type ECC, the request being directed to the line of data, transform the first type ECC syndrome for the line of data to a second type ECC syndrome send a response to the master. The response includes the line of data and the second type ECC syndrome associated with the line of data.

公开(公告)号：US11194617B2

公开(公告)日：2021-12-07

申请号：US16882356

申请日：2020-05-22

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Abhijeet Ashok Chachad ,  David Matthew Thompson

IPC: G06F12/10 ,  G06F9/46 ,  G06F9/48 ,  G06F9/448 ,  G06F11/30 ,  G06F9/54 ,  G06F12/0811 ,  G06F9/38 ,  G06F12/0813 ,  G06F12/0817 ,  G06F9/30 ,  G06F12/0871 ,  G06F12/0891 ,  G06F12/12 ,  G06F13/16 ,  G06F12/0888 ,  G06F12/0831 ,  G06F12/0855 ,  G06F12/0804 ,  G06F12/121

Abstract: A method includes receiving, by a level two (L2) controller, a write request for an address that is not allocated as a cache line in a L2 cache. The write request specifies write data. The method also includes generating, by the L2 controller, a read request for the address; reserving, by the L2 controller, an entry in a register file for read data returned in response to the read request; updating, by the L2 controller, a data field of the entry with the write data; updating, by the L2 controller, an enable field of the entry associated with the write data; and receiving, by the L2 controller, the read data and merging the read data into the data field of the entry.

公开(公告)号：US11169924B2

公开(公告)日：2021-11-09

申请号：US16856169

申请日：2020-04-23

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Bipin Prasad Heremagalur Ramaprasad ,  David Matthew Thompson ,  Abhijeet Ashok Chachad ,  Hung Ong

IPC: G06F12/08 ,  G06F12/0862 ,  G06F9/38 ,  G06F12/0811

Abstract: An apparatus includes a CPU core, a first memory cache with a first line size, and a second memory cache having a second line size larger than the first line size. Each line of the second memory cache includes an upper half and a lower half. A memory controller subsystem is coupled to the CPU core and to the first and second memory caches. Upon a miss in the first memory cache for a first target address, the memory controller subsystem determines that the first target address resulting in the miss maps to the lower half of a line in the second memory cache, retrieves the entire line from the second memory cache, and returns the entire line from the second memory cache to the first memory cache.