W632GG8KB datasheet(21/159 Pages) WINBOND

21 / 159 page

W632GG8KB

Publication Release Date: Jul. 28, 2014

Revision: A04

- 21 -

8.3.2.6

Output Disable

The DDR3 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

provided and the TDQS# pin is not used. See Table 3 for details.

Table 3

– TDQS, TDQS# Function Matrix

MR1 (A11)

DM / TDQS

NU / TDQS#

0 (TDQS Disabled)

Hi-Z

1 (TDQS Enabled)

TDQS

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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