发明名称 |
Information processing system including semiconductor device having self-refresh mode |
摘要 |
Disclosed herein is a semiconductor device having first and second operation modes. In the first operation mode, the semiconductor device deactivates a DLL circuit during a self-refresh mode. In the second operation mode, the semiconductor device intermittently activates the DLL circuit to generate an internal clock signal. |
申请公布号 |
US8811105(B2) |
申请公布日期 |
2014.08.19 |
申请号 |
US201213559244 |
申请日期 |
2012.07.26 |
申请人 |
PS4 Luxco S.A.R.L. |
发明人 |
Fujisawa Hiroki |
分类号 |
G11C7/00;G11C11/406 |
主分类号 |
G11C7/00 |
代理机构 |
McGinn IP Law Group, PLLC |
代理人 |
McGinn IP Law Group, PLLC |
主权项 |
1. An information processing system comprising:
a first device including a memory cell array that holds storage data, an input buffer circuit to which an external clock signal having a predetermined frequency is supplied, and a DLL circuit that generates an internal clock signal that is phase-controlled based on the external clock signal, the first device having a self-refresh mode in which a refresh operation of the storage data is periodically performed asynchronously with the external clock signal; and a second device issuing the external clock signal, a self-refresh command that causes the first device to enter the self-refresh mode, and a self-refresh exit command that causes the first device to exit the self-refresh mode, wherein the second device continuously issues the external clock signal to the first device while the first device is in the self-refresh mode, and the first device intermittently activates the input buffer circuit and the DLL circuit in conjunction with each other while the first device is in the self-refresh mode. |
地址 |
Luxembourg LU |