NT5CC128M8FN-DII datasheet(28/165 Pages) NANYA

28 / 165 page

DDR3(L) 1Gb SDRAM

NT5CB(C)128M8FN / NT5CB(C)64M16FP(Y)

Version 1.8

Nanya Technology Cooperation ©

08/ 2015

Multi-Purpose Register (MPR)

The Multi Purpose Register (MPR) function is used to Read out a predefined system timing calibration bit sequence. To

enable the MPR, a Mode Register Set (MRS) command must be issued to MR3 register with bit A2=1. Prior to issuing the

MRS command, all banks must be in the idle state (all banks precharged and tRP met). Once the MPR is enabled, any

subsequent RD or RDA commands will be redirected to the Multi Purpose Register. When the MPR is enabled, only RD or

RDA commands are allowed until a subsequent MRS command is issued with the MPR disabled (MR3 bit A2=0). Power

down mode, Self-Refresh and any other non-RD/RDA command is not allowed during MPR enable mode. The RESET

function is supported during MPR enable mode.

The Multi Purpose Register (MPR) function is used to Read out a predefined system timing calibration bit sequence.

Fig. 1: MPR Block Diagram

To enable the MPR, a MODE Register Set (MRS) command must be issued to MR3 Register with bit A2 = 1, prior to issuing

the MRS command, all banks must be in the idle state (all banks precharged and tRP met). Once the MPR is enabled, any

subsequent RD or RDA commands will be redirected to the Multi Purpose Register. The resulting operation, when a RD or

RDA command is issued, is defined by MR3 bits A[1:0] when the MPR is enabled as shown. When the MPR is enabled,

only RD or RDA commands are allowed until a subsequent MRS command is issued with the MPR disabled (MR3 bit A2 =

0). Note that in MPR mode RDA has the same functionality as a READ command which means the auto precharge part of

RDA is ignored. Power-Down mode, Self-Refresh and any other non-RD/RDA command is not allowed during MPR enable

mode. The RESET function is supported during MPR enable mode.

NT5CC128M8FN-DII Datasheet(PDF) 28 Page - Nanya Technology Corporation.