EM44DM0888LBA
Pin Description (Continued)
(Data Strobe)
Output with read data, input with write data. Edge-aligned with read
data, centered in write data. An RDQS option using DM pin can be
enabled via the EMRS(1) to simplify read timing.
The data strobes DQS and RDQS may be used in single ended mode
or paired with optional complimentary signals /DQS and /RDQS to
provide differential pair signaling to the system during both reads and
writes. An EMRS(1) control bit enables or disables all complementary
data strobe signals.
RDQS,/RDQS
, DQS,/DQS
B3,A2,B7,A8
(Data Mask)
DM is an input mask signal for write data. Input data is masked when
DM is sampled HIGH coincident with that input data during a Write
access. DM is sampled on both edges of DQS. Although DM pins are
input only, the DM loading matches the DQ and DQS loading. DM is
enabled by EMRS command.
B3
DM
(Data Input/Output)
C8,C2,D7,D3,
D1,D9,B1,B9
DQ0~7
Data inputs and outputs are on the same pin.
(Power Supply/Ground)
A1,L1,E9,H9/
A3,E3,J1,K9
VDD/VSS
VDD and VSS are power supply for internal circuits.
(DQ Power Supply/DQ Ground)
A9,C1,C3,C7,
VDDQ/VSSQ
C9/A7,B2,B8,
D2,D8
VDDQ and VSSQ are power supply for the output buffers.
(DLL Power Supply/DLL Ground)
VDDL and VSSDL are power supply for DLL circuits
(Reference Voltage)
E1/E7
E2
VDDL/VSSDL
VREF
SSTL_1.8 reference voltage
(No Connection)
L3,L7
NC
No internal electrical connection is present.
Feb. 2012
6/29
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