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參數(shù)資料
| 型號： | UPD46128512-X |
| 廠商： | NEC Corp. |
| 英文描述： | 128M-BIT CMOS MOBILE SPECIFIED RAM 8M-WORD BY 16-BIT EXTENDED TEMPERATURE OPERATION |
| 中文描述： | 128兆位CMOS移動指明內(nèi)存800萬字由16位溫度范圍 |
| 文件頁數(shù)： | 11/82頁 |
| 文件大小： | 817K |
| 代理商： | UPD46128512-X |
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Preliminary Data Sheet M17507EJ2V0DS
11
μ
PD46128512-X
2. Partial Refresh
2.1 Standby Mode
In addition to the regular standby mode (Standby Mode 1) with a 128M bits density, Standby Mode 2, which performs
partial refresh, is also provided.
2.2 Density Switching
In Standby Mode 2, the densities that can be selected for performing refresh are 32M bits, 16M bits, 8M bits, and 0M
bit.
The density for performing refresh can be set with the mode register. Once the refresh density has been set in the
mode register, these settings are retained until they are set again, while applying the power supply. However, the mode
register setting will become undefined if the power is turned off, so set the mode register again after power application.
(For how to perform mode register settings, refer to section
5. Mode Register Settings
.)
2.3 Standby Mode Status Transition
In Standby Mode 1, /CE1 and CE2 are HIGH. In Standby Mode 2, CE2 is LOW. In Standby Mode 2, if 0M bit is set as
the density, it is necessary to perform initialization the same way as after applying power, in order to return to normal
operation from Standby Mode 2. When the density has been set to 32M bits, 16M bits, or 8M bits in Standby Mode 2, it is
not necessary to perform initialization to return to normal operation from Standby Mode 2.
For the timing charts, refer to
Figure 10-1. Standby Mode 2 Entry / Exit Timing Chart (Asynchronous Mode)
,
Figure 10-2. Standby Mode 2 (data not held) Entry / Exit Timing Chart (Asynchronous Mode)
.
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