hyb18t512161bf-33 Infineon Technologies Corporation, hyb18t512161bf-33 Datasheet - Page 24

• Manufacturer Part Number: hyb18t512161bf-33
• Description: 512-mbit X16 Gddr2 Dram
• Manufacturer: Infineon Technologies Corporation

3.7
The DLL must be enabled for normal operation. DLL
enable is required during power up initialization, and
upon returning to normal operation after having the DLL
disabled. The DLL is automatically disabled when
entering Self-Refresh operation and is automatically re-
enabled and reset upon exit of Self-Refresh operation.
3.8
Under normal operation, the DRAM outputs are
enabled during Read operation for driving data (Qoff bit
in the EMR(1) is set to 0). When the Qoff bit is set to 1,
the DRAM outputs will be disabled. Disabling the
3.9
Table 8
RDQS, RQDS which can be programmed by A[11:10]
address bits in EMRS. RDQS and RDQS are available
Table 8
EMRS(1)
A11
(RDQS Enable)
0 (Disable)
0 (Disable)
1 (Enable)
1 (Enable)
Data Sheet
lists all possible combinations for DQS, DQS,
DLL Enable/Disable
Output Disable (Qoff)
Single-ended and Differential Data Strobe Signals
Single-ended and Differential Data Strobe Signals
A10
(DQS Enable)
0 (Enable)
1 (Disable)
0 (Enable)
1 (Disable)
Strobe Function Matrix
RDQS/DM
DM
DM
RDQS
RDQS
RDQS
Hi-Z
Hi-Z
RDQS
Hi-Z
24
Any time the DLL is reset, 200 clock cycles must occur
before a Read command can be issued to allow time for
the internal clock to be synchronized with the external
clock. Failing to wait for synchronization to occur may
result in a violation of the
DRAM outputs allows users to measure
during Read operations, without including the output
buffer current and external load currents.
in
components, the DM function is disabled. RDQS is
active for reads and don’t care for writes.
DQS
DQS
DQS
DQS
DQS
512-Mbit Double-Data-Rate-Two SDRAM
8 components only. If RDQS is enabled in
DQS
DQS
Hi-Z
DQS
Hi-Z
HYB18T512161BF–22/25/28/33
Signaling
differential DQS signals
single-ended DQS signals
differential DQS signals
single-ended DQS signals
t
AC
or
Functional Description
t
05102005-C5U8-7TLE
DQSCK
Rev. 1.1, 2005-08
parameters.
I
DD
currents
8