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參數(shù)資料
| 型號： | K4J55323QF-GC16 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | 256Mbit GDDR3 SDRAM |
| 中文描述： | 片256Mbit GDDR3 SDRAM的 |
| 文件頁數(shù)： | 21/49頁 |
| 文件大?。?/td> | 1027K |
| 代理商： | K4J55323QF-GC16 |
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256M GDDR3 SDRAM
K4J55323QF-GC
Rev 1.8 (Apr. 2005)
ON-DIE TERMINATION
Bus snooping for READ commands other than /CS is used to control the on-die termination. The GDDR3 SDRAM will dis-
able the on-die termination when a READ command is detected, regardless of the state of /CS. The on-die termination is
disabled x clocks after the READ command where x equals CL-1 and stay off for a duration of BL/2 + 2, as below figure,
Data Termination Disable Timing. In a two-rank system, both DRAM devices snoop the bus for READ commands to either
device and both will disable the on-die termination if a READ command is detected. The on-die termination for all other
pins on the device are always on for both a single-rank system and a dual-rank system.
The on-die termination value on address and control pins is determined during power-up in relation to the state of CKE on
the first transition of RESET. On the rising edge of RESET, if CKE is sampled LOW, then the configuration is determined to
be a single-rank system. The on-die termination is then set to one-half ZQ for the address pins. On the rising edge of
RESET, if CKE is sampled HIGH, then the configuration is determined to be a dual-rank system. The on-die termination for
the DQs, WDQS, and DM pins is set in the EMRS.
NOP
NOP
NOP
NOP
NOP
READ
T0
T7
T8
T8n
T9
T9n
T10
T11
CK#
CK
COMMAND
ADDRESS
RDQS
DQ
～
～
～
～
～
～
～
～
Bank a,
Col n
CL = 8
DO
n
DQ
TERMINATION
GDDR3 Data Termination is Disabled
Data Termination Disable Timing
Note :
1. DO
n
= data-out from column
n
.
2. Burst length = 4.
3. Three subsequent elements of data-out appear in the specified order following DO
n
.
4. Shown with nominal t
AC
and t
DQSQ
.
5. RDQS will start driving high one-half cycle prior to the first falling edge.
6. The Data Terminators are disabled starting at CL-1 and the duration is BL/2 + 2
7. READS to either rank disable both ranks’ termination regardless of the logic level of /CS.
DON’T CARE
TRANSITIONING DATA
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