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Active random access memory

專利號(hào)
US10867642B2
公開(kāi)日期
2020-12-15
申請(qǐng)人
TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LIMITED(TW Hsinchu)
發(fā)明人
Hsin-Cheng Chen; Jung-Rung Jiang; Yen-Hao Huang
IPC分類
G11C7/10; G11C11/418; G06F12/00; G11C11/419; G06F12/02; G11C7/22
技術(shù)領(lǐng)域
write,read,ns,commands,clock,master,memory,command,circuitry,pattern
地域: Hsinchu

摘要

Systems and methods for processing commands at a random access memory. A series of commands are received to read data from the random access memory or to write data to the random access memory. The random access memory can process commands at a first rate when the series of commands matches a pattern, and at a second, slower, rate when the series of commands does not match the pattern. A determination is made as to whether the series of commands matches the pattern based on at least a current command and a prior command in the series of commands. A ready signal is asserted when said determining determines that the series of commands matches the pattern, where the random access memory is configured to receive and process commands faster than the second rate when the pattern is matched and the ready signal is asserted over a period of multiple commands.

說(shuō)明書(shū)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

FIG. 9 is a diagram depicting performance of a memory that includes pattern matching circuitry under a worst case scenario. In the example of FIG. 9, when a third write command is received along with its associated data (D2) and address (A2) from the master device 902, the pattern matching circuitry detects that the third write command is not writing to the same data word as the first write command on the first write path. Thus, the next write command will not be performed in the best case scenario time, instead taking close to 0.99 ns to complete. The pattern detecting circuitry of the memory 904 deasserts the RDY signal for the fourth clock cycle, indicating to the master device 902 to hold the fourth write command for an additional clock cycle. As indicated in FIG. 9, as an alternative to using the RDY signal to inform the master device 902 that the master device 902 should wait, the master device 902 can determine, based on its sending consecutive write commands that reference bytes in different data words, that the master device 902 should wait a predetermined one or more clock cycles on its own, before sending (or deasserting) a next write command.

權(quán)利要求

1
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