MT46H16M16 데이터 시트보기 (PDF) - Micron Technology
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MT46H16M16 Datasheet PDF : 79 Pages
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256Mb: x16, x32 Mobile DDR SDRAM
Register Definition
Figure 8: Extended Mode Register
BA1 BA0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 Address Bus
E14 E13 E12 E11 E10 E9 E8 E7 E6 E5 E4 E3 E2 E1 E0
14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
10
Set to “0”
DS TCSR1
PASR
Extended Mode
Register
E14 E13 Mode Register Definition
0 0 Standard mode register
0 1 Reserved
1 0 Extended mode register
1 1 Reserved
E6 E5 Driver Strength
0 0 Full-strength driver
0 1 Half-strength driver
1 0 Quarter-strength driver
1 1 One-eighth-strength driver
E12 E11 E10 E9 E8 E7 E6–E0 Operating Mode
0 0 0 0 0 0 Valid Normal operation
–– – – – –
– All other states reserved
E2 E1 E0
000
001
010
011
100
101
110
111
Partial-Array Self Refresh Coverage
Full array
Half array
Quarter array
Reserved
Reserved
One-eighth array
One-sixteenth array
Reserved
Notes: 1. On-die temperature sensor is used in place of TCSR. Setting these bits will have no effect.
Stopping the External Clock
One method of controlling the power efficiency in applications is to throttle the clock
that controls the DDR SDRAM. Control the clock in two ways:
• Change the clock frequency.
• Stop the clock.
The Mobile DDR SDRAM enables the clock to change frequency during operation only if
all the timing parameters are met and all refresh requirements are satisfied.
The clock can be stopped if no DRAM operations are in progress that would be affected
by this change. Any DRAM operation already in process must be completed before
entering clock stop mode; this includes the following timings: tRCD, tRP, tRFC, tMRD,
tWR, and all data-out for READ bursts.
For example, if a WRITE or a READ is in progress, the entire data burst must be complete
prior to stopping the clock. For READs, a burst completion is defined when the read
postamble is satisfied. For WRITEs, a burst completion is defined when the write post-
amble and tWR or tWTR are satisfied.
PDF: 09005aef82091978 / Source: 09005aef8209195b
MT46H16M16LF__2.fm - Rev. H 6/08 EN
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Micron Technology, Inc., reserves the right to change products or specifications without notice.
©2005 Micron Technology, Inc. All rights reserved.
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