k4j55323qf-gc Samsung Semiconductor, Inc., k4j55323qf-gc Datasheet - Page 16

• Manufacturer Part Number: k4j55323qf-gc
• Description: 256mbit Gddr3 Sdram
• Manufacturer: Samsung Semiconductor, Inc.

K4J55323QF-GC
DLL ENABLE/DISABLE
to normal operation after disabling the DLL for debugging or evaluation. (When the device exits self refresh mode, the DLL
is enabled automatically.) Any time the DLL is enabled, 20K clock cycles must occur before a READ command can be
issued.
DATA TERMINATION
supports 60
DATA DRIVER IMPEDANCE
used the data driver impedance is set to 40
When any other value is selected the target impedance is set nominally to the desired impedance. However, the accuracy
is now determined by the device’s specific process corner, applied voltage and operating temperature.
ADDITIVE LATENCY
number of clock cycles that is to be added to CL after CAS is captured by the rising edge of CK. Thus the total CAS latency
is determined by adding CL and AL.
MANUFACTURERS VENDOR CODE AND REVISION IDENTIFICATION
set to one, and bits A0-A9 and A11 set to the desired values. When the V function is enabled the GDDR3 SDRAM will pro-
vide its manufacturers vendor code on DQ[3:0] and revision identification on DQ[7:4]
The Additive Latency function (AL) is used to optimize the command bus efficiency. The AL value is used to determine the
The Manufacturers Vendor Code, V, is selected by issuing a EXTENDED MODE REGISTER SET command with bits A10
The DLL must be enabled for normal operation. DLL enable is required during power-up initialization and upon returning
The Data Termination, DT, is used to determine the value of the internal data termination resisters. The GDDR3 SDRAM
The Data Driver impedance (DZ) is used to determine the value of the data drivers impedance. When autocalibration is
Manufacturer
Ω
Reserved
Samsung
and 120
Infineon
Nanya
Elpida
Etron
Ω
termination. The termination may also be disabled for testing and other purposes.
DQ[3:0]
0
1
2
3
4
5
Ω
Manufacturer
s and it’s tolerance is determined by the calibration accuracy of the device.
Reserved
Reserved
Winbond
ESMT
Mosel
Hynix
- 16 -
DQ[3:0]
A
B
6
7
8
9
Manufacturer
Reserved
Reserved
Reserved
Micron
256M GDDR3 SDRAM
DQ[3:0]
C
D
E
F
Rev 1.7 (Jan. 2005)