W632GU8KB Datasheet, PDF (21/160 Pages) Winbond – 32M X 8 BANKS X 8 BIT DDR3L SDRAM

W632GU8KB
8.3.2.6 Output Disable
The DDR3L SDRAM outputs may be enabled/disabled by MR1 (bit A12) as shown in Figure 6. When
this feature is enabled (A12 = 1), all output pins (DQs, DQS, DQS#, etc.) are disconnected from the
device, thus removing any loading of the output drivers. This feature may be useful when measuring
module power, for example. For normal operation, A12 should be set to ‘0’.
8.3.2.7 TDQS, TDQS#
TDQS (Termination Data Strobe) provides additional termination resistance outputs that may be useful
in some system configurations. When enabled via the mode register, the same termination resistance
function is applied to the TDQS/TDQS# pins that is applied to the DQS/DQS# pins.
In contrast to the RDQS function of DDR2 SDRAM, TDQS provides the termination resistance function
only. The data strobe function of RDQS is not provided by TDQS.
The TDQS and DM functions share the same pin. When the TDQS function is enabled via the mode
register, the DM function is not supported. When the TDQS function is disabled, the DM function is
provided and the TDQS# pin is not used. See Table 3 for details.
Table 3 – TDQS, TDQS# Function Matrix
MR1 (A11)
0 (TDQS Disabled)
1 (TDQS Enabled)
DM / TDQS
DM
TDQS
NU / TDQS#
Hi-Z
TDQS#
Notes:
1. If TDQS is enabled, the DM function is disabled.
2. When not used, TDQS function can be disabled to save termination power.
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Publication Release Date: Jan. 20, 2015
Revision: A05