公开(公告)号：US09268708B2

公开(公告)日：2016-02-23

申请号：US14637580

申请日：2015-03-04

Applicant: Texas Instruments Incorporated

Inventor： Raguram Damodaran ,  Abhijeet Ashok Chachad ,  Jonathan (Son) Hung Tran ,  David Matthew Thompson

IPC: G06F12/12 ,  G06F12/10 ,  G06F7/483 ,  G06F9/30 ,  H03M13/35 ,  H03M13/29 ,  G06F11/10 ,  G06F13/16 ,  G06F13/18 ,  H03K19/00 ,  G06F1/32 ,  H03K21/00 ,  G06F12/02 ,  G06F12/08 ,  G06F13/364

CPC classification number: G06F12/1081 ,  G06F1/3296 ,  G06F7/483 ,  G06F9/3012 ,  G06F11/1064 ,  G06F12/0246 ,  G06F12/0811 ,  G06F12/0815 ,  G06F12/12 ,  G06F13/1605 ,  G06F13/1652 ,  G06F13/1657 ,  G06F13/1663 ,  G06F13/18 ,  G06F13/364 ,  G06F2212/1021 ,  G06F2212/1032 ,  G06F2212/221 ,  G06F2212/2532 ,  G06F2212/283 ,  G06F2212/608 ,  H03K19/0016 ,  H03K21/00 ,  H03M13/2903 ,  H03M13/353 ,  Y02D10/124 ,  Y02D10/172 ,  Y02D50/20

Abstract: This invention assures cache coherence in a multi-level cache system upon eviction of a higher level cache line. A victim buffer stored data on evicted lines. On a DMA access that may be cached in the higher level cache the lower level cache sends a snoop write. The address of this snoop write is compared with the victim buffer. On a hit in the victim buffer the write completes in the victim buffer. When the victim data passes to the next cache level it is written into a second victim buffer to be retired when the data is committed to cache. DMA write addresses are compared to addresses in this second victim buffer. On a match the write takes place in the second victim buffer. On a failure to match the controller sends a snoop write.

公开(公告)号：US20150178221A1

公开(公告)日：2015-06-25

申请号：US14637580

申请日：2015-03-04

Applicant: Texas Instruments Incorporated

Inventor： Raguram Damodaran ,  Abhijeet Ashok Chachad ,  Jonathan (Son) Hung Tran ,  David Matthew Thompson

IPC: G06F12/12

CPC classification number: G06F12/1081 ,  G06F1/3296 ,  G06F7/483 ,  G06F9/3012 ,  G06F11/1064 ,  G06F12/0246 ,  G06F12/0811 ,  G06F12/0815 ,  G06F12/12 ,  G06F13/1605 ,  G06F13/1652 ,  G06F13/1657 ,  G06F13/1663 ,  G06F13/18 ,  G06F13/364 ,  G06F2212/1021 ,  G06F2212/1032 ,  G06F2212/221 ,  G06F2212/2532 ,  G06F2212/283 ,  G06F2212/608 ,  H03K19/0016 ,  H03K21/00 ,  H03M13/2903 ,  H03M13/353 ,  Y02D10/124 ,  Y02D10/172 ,  Y02D50/20

Abstract: This invention assures cache coherence in a multi-level cache system upon eviction of a higher level cache line. A victim buffer stored data on evicted lines. On a DMA access that may be cached in the higher level cache the lower level cache sends a snoop write. The address of this snoop write is compared with the victim buffer. On a hit in the victim buffer the write completes in the victim buffer. When the victim data passes to the next cache level it is written into a second victim buffer to be retired when the data is committed to cache. DMA write addresses are compared to addresses in this second victim buffer. On a match the write takes place in the second victim buffer. On a failure to match the controller sends a snoop write.

Abstract translation: 本发明在驱逐较高级别的高速缓存行时确保多级高速缓存系统中的高速缓存一致性。 受害者缓冲区将数据存储在被驱逐的行上。 在可能缓存在较高级别缓存中的DMA访问中，下级缓存发送窥探写。 将该窥探写的地址与受害缓冲区进行比较。 在受害缓冲区中的命中，写入在受害缓冲区中完成。 当受害者数据传递到下一个缓存级别时，当数据被提交到高速缓存时，它被写入第二个受害缓冲区以便退出。 DMA写地址与第二个受害缓冲区中的地址进行比较。 在匹配中，写入发生在第二个受害缓冲区中。 在无法匹配的情况下，控制器发出一个窥探写。

公开(公告)号：US12147301B2

公开(公告)日：2024-11-19

申请号：US18325181

申请日：2023-05-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： David Matthew Thompson ,  Abhijeet Ashok Chachad

IPC: G06F11/10 ,  G06F9/30 ,  G06F9/38 ,  G06F9/448 ,  G06F9/46 ,  G06F9/48 ,  G06F9/52 ,  G06F12/0811 ,  G06F12/0815 ,  G06F12/0879 ,  G06F12/0888 ,  G06F12/0895 ,  G06F12/128 ,  G06F13/16 ,  H03M13/15

Abstract: An apparatus includes a central processing unit (CPU) core and a cache subsystem coupled to the CPU core. The cache subsystem includes a first memory, a second memory, and a controller coupled to the first and second memories. The controller is configured to execute a sequence of scrubbing transactions on the first memory and execute a functional transaction on the second memory. One of the scrubbing transactions and the functional transaction are executed concurrently.

公开(公告)号：US12141601B2

公开(公告)日：2024-11-12

申请号：US18456568

申请日：2023-08-28

Applicant: TEXAS INSTRUMENTS INCORPORATED

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

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

Abstract: A method includes receiving, by a L2 controller, a request to perform a global operation on a L2 cache and preventing new blocking transactions from entering a pipeline coupled to the L2 cache while permitting new non-blocking transactions to enter the pipeline. Blocking transactions include read transactions and non-victim write transactions. Non-blocking transactions include response transactions, snoop transactions, and victim transactions. The method further includes, in response to an indication that the pipeline does not contain any pending blocking transactions, preventing new snoop transactions from entering the pipeline while permitting new response transactions and victim transactions to enter the pipeline; in response to an indication that the pipeline does not contain any pending snoop transactions, preventing, all new transactions from entering the pipeline; and, in response to an indication that the pipeline does not contain any pending transactions, performing the global operation on the L2 cache.

公开(公告)号：US20240320154A1

公开(公告)日：2024-09-26

申请号：US18733125

申请日：2024-06-04

Applicant: Texas Instruments Incorporated

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

IPC: G06F12/0811 ,  G06F9/46 ,  G06F12/0817 ,  G06F12/0831 ,  G06F12/1081 ,  G06F12/14 ,  G06F21/79

CPC classification number: G06F12/0811 ,  G06F9/467 ,  G06F12/0828 ,  G06F12/0831 ,  G06F12/1081 ,  G06F12/1441 ,  G06F21/79

Abstract: An example system includes first and second level memories and first and second memory controllers respectively coupled thereto. The system also includes a shadow cache associated with the second level memory and coupled to the second memory controller, which is also coupled to the first memory controller. In response to a generated read operation that includes a secure code, the second memory controller determines whether an address of the read operation matches an address that is tagged in the shadow cache; and determine whether the secure code of the read operation matches a secure code of a cache line hit by the read operation. The second memory controller then performs one of two sets of additional operations, depending on whether or not the address of the read operation matches the address tagged in the shadow cache and whether or not the secure code of the read operation matches the secure code of the cache line.

公开(公告)号：US12038840B2

公开(公告)日：2024-07-16

申请号：US18334740

申请日：2023-06-14

Applicant: Texas Instruments Incorporated

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

IPC: G06F12/0811 ,  G06F9/46 ,  G06F12/0817 ,  G06F12/0831 ,  G06F12/1081 ,  G06F12/14 ,  G06F21/79 ,  G06F12/0864 ,  G06F12/128

CPC classification number: G06F12/0811 ,  G06F9/467 ,  G06F12/0828 ,  G06F12/0831 ,  G06F12/1081 ,  G06F12/1441 ,  G06F21/79

Abstract: In described examples, a coherent memory system includes a central processing unit (CPU), and first and second level caches, each with a cache controller. The CPU is arranged to execute program instructions to manipulate data in at least a first or second secure context. Each of the first and second caches stores a secure code for indicating the secure context by which data for a respective cache line is received. The first and second level caches maintain coherency in response to comparing the secure codes of respective lines of cache and executing a cache coherency operation in response. A requestor coupled to the second level cache may send a coherence read transaction to the second level cache controller, which upon an affirmative security check, generates a snoop read transaction and sends the same to the first level cache.

公开(公告)号：US11977491B2

公开(公告)日：2024-05-07

申请号：US18194708

申请日：2023-04-03

Applicant: TEXAS INSTRUMENTS INCORPORATED

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

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

CPC classification number: G06F12/1045 ,  G06F15/7807 ,  G06F2212/301 ,  G06F2212/50

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：US11940918B2

公开(公告)日：2024-03-26

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: G06F12/00 ,  G06F1/14 ,  G06F9/54 ,  G06F12/0811 ,  G06F12/0842 ,  G06F12/0888

CPC classification number: G06F12/0842 ,  G06F1/14 ,  G06F9/544 ,  G06F12/0811 ,  G06F12/0888 ,  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：US20230325314A1

公开(公告)日：2023-10-12

申请号：US18334740

申请日：2023-06-14

Applicant: Texas Instruments Incorporated

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

IPC: G06F12/0811 ,  G06F12/0817 ,  G06F9/46 ,  G06F21/79 ,  G06F12/1081 ,  G06F12/0831 ,  G06F12/14

CPC classification number: G06F12/0811 ,  G06F12/0828 ,  G06F9/467 ,  G06F21/79 ,  G06F12/1081 ,  G06F12/0831 ,  G06F12/1441

Abstract: In described examples, a coherent memory system includes a central processing unit (CPU), and first and second level caches, each with a cache controller. The CPU is arranged to execute program instructions to manipulate data in at least a first or second secure context. Each of the first and second caches stores a secure code for indicating the secure context by which data for a respective cache line is received. The first and second level caches maintain coherency in response to comparing the secure codes of respective lines of cache and executing a cache coherency operation in response. A requestor coupled to the second level cache may send a coherence read transaction to the second level cache controller, which upon an affirmative security check, generates a snoop read transaction and sends the same to the first level cache.

公开(公告)号：US11762683B2

公开(公告)日：2023-09-19

申请号：US17542573

申请日：2021-12-06

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Abhijeet Ashok Chachad ,  David Matthew Thompson

IPC: 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

CPC classification number: G06F9/467 ,  G06F9/30047 ,  G06F9/30079 ,  G06F9/30098 ,  G06F9/30101 ,  G06F9/30189 ,  G06F9/3867 ,  G06F9/4498 ,  G06F9/4881 ,  G06F9/544 ,  G06F11/3037 ,  G06F12/0811 ,  G06F12/0813 ,  G06F12/0824 ,  G06F12/0828 ,  G06F12/0831 ,  G06F12/0855 ,  G06F12/0871 ,  G06F12/0888 ,  G06F12/0891 ,  G06F12/12 ,  G06F13/1668 ,  G06F12/0804 ,  G06F12/121 ,  G06F2212/1016 ,  G06F2212/1044 ,  G06F2212/621

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.