Invention Grant
- Patent Title: Memory interface and operating method of memory interface
- Patent Title (中): 存储器接口和存储器接口的操作方法
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Application No.: US12588849Application Date: 2009-10-29
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Publication No.: US08271824B2Publication Date: 2012-09-18
- Inventor: Reiko Kuroki
- Applicant: Reiko Kuroki
- Applicant Address: JP Kawasaki-shi, Kanagawa
- Assignee: Renesas Electronics Corporation
- Current Assignee: Renesas Electronics Corporation
- Current Assignee Address: JP Kawasaki-shi, Kanagawa
- Agency: McGinn IP Law Group, PLLC
- Priority: JP2008-279218 20081030
- Main IPC: G06F1/04
- IPC: G06F1/04 ; G06F1/12 ; G06F1/10 ; G11C11/409

Abstract:
A memory interface circuit includes a clock signal supply buffer configured to send a system clock signal which is supplied through a reference node, to a memory through a transmission line; a data strobe buffer configured to receive a data strobe signal supplied from the memory; a system clock synchronizing circuit configured to supply a data read from the memory to a logic circuit in synchronization with the system clock signal; and a delay detecting circuit provided at a front stage to the system clock synchronizing circuit and configured to detect a transmission delay from the clock signal supply buffer to the data strobe buffer. The delay detecting circuit generates a phase difference data indicating the transmission delay based on a difference between a phase of the system clock signal and a phase of the data strobe signal outputted from the data strobe buffer, and supplies the phase difference data to the system clock synchronizing circuit. The system clock synchronizing circuit generates a read clock signal by shifting the system clock signal based on the phase difference data, and controls a supply timing at which the data is supplied to the logic circuit, based on the read clock signal.
Public/Granted literature
- US20100115324A1 Memory interface and operating method of memory interface Public/Granted day:2010-05-06
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