W641GG2JB Datasheet, PDF (30/109 Pages) Winbond – 1-Gbit GDDR3 Graphics SDRAM

W641GG2JB
1-Gbit GDDR3 Graphics SDRAM
Notes :
1. When the device is in scan mode, the mirror function will be disabled and none of the pins are remapped.
2. Since the other input of the MUX for DM0 tied to GND, the device will output the continuous zeros after scanning a bit #67, if the
chip stays in scan shift mode.
3. An unconnected CS1# and A12 on the board will be read as undefined.
6.4.2.3 Scan Pin Description
PACKAGE SYMBOL NORMAL TYPE
BALL
FUNCTION
DESCRIPTION
V-9
SSH
RES
Input
Scan Shift: Capture the data input from the pad at logic LOW and shift the
data on the chain at logic HIGH.
F-9
SCK
CS
Input
Scan Clock: Not a true clock, could be a single pulse or series of pulses.
All scan inputs will be referenced to rising edge of the scan clock
D-2
SOUT
WDQS0 Output Scan Output
V-4
SEN
SEN
Input
Scan Enable: Logic HIGH enables the device into scan mode and will be
disabled at logic LOW. Must be tied to GND when not in use.
A-9
SOE
Scan Output Enable: Enables (registered LOW) and disables (registered
MF
Input ^{HIGH) SOUT data. This pin will be tied to VDD or GND through a resistor}
(typically 1 KΩ for normal operation). Tester needs to overdrive this pin to
guarantee the required input logic level in scan mode.
Notes :
1. When SEN is asserted, no commands are to be executed by the GDDR3. This applies both to user commands and
manufacturing commands which may exist while RES is deasserted.
2. The Scan Function can be used right after bringing up V_DD / V_DDQ of the device. No initialization sequence of the device is
required. After leaving the Scan Function it is required to run through the complete initialization sequence.
3. In Scan Mode all terminations for CMD/ADD and DQ, DM, RDQS and WDQS are switched off.
4. In a double-load clam-shell configuration, SEN will be asserted to both devices. Separate two SOE‘s should be provided to top and
bottom devices to access the scanned output. When either of the devices is in scan mode, SOE for the other device which is not in a
scan will be disabled.
6.4.2.4 Scan DC Electrical Characteristics and Operating Condition
PARAMETER/CONDITION
Symbol
Input High (Logic 1) Voltage
Input Low (Logic 0) Voltage -
Notes :
1. The parameter applies only when SEN is asserted.
2. All voltages referenced to GND.
V_IH(DC)
V_IL(DC)
Min.
V_REF+0.15
—
Max.
—
V_REF-0.15 V
Units
Note
1,2
1,2
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Publication Release Date: Apr, 22, 2011
Revision A01-002