Datasheet

Table 4: 96-Ball FBGA – x16 Ball Descriptions
Symbol Type Description
A[15:13], A12/BC#,
A11, A10/AP, A[9:0]
Input Address inputs: Provide the row address for ACTIVATE commands, and the column
address and auto precharge bit (A10) for READ/WRITE commands, to select one
location out of the memory array in the respective bank. A10 sampled during a
PRECHARGE command determines whether the PRECHARGE applies to one bank
(A10 LOW, bank selected by BA[2:0]) or all banks (A10 HIGH). The address inputs also
provide the op-code during a LOAD MODE command. Address inputs are referenced
to V
REFCA
. A12/BC#: When enabled in the mode register (MR), A12 is sampled during
READ and WRITE commands to determine whether burst chop (on-the-fly) will be
performed (HIGH = BL8 or no burst chop, LOW = BC4). See the Truth Table – Com-
mand section.
BA[2:0] Input Bank address inputs: BA[2:0] define the bank to which an ACTIVATE, READ,
WRITE, or PRECHARGE command is being applied. BA[2:0] define which mode
register (MR0, MR1, MR2, or MR3) is loaded during the LOAD MODE command.
BA[2:0] are referenced to V
REFCA
.
CK, CK# Input Clock: CK and CK# are differential clock inputs. All control and address input signals
are sampled on the crossing of the positive edge of CK and the negative edge of
CK#. Output data strobe (DQS, DQS#) is referenced to the crossings of CK and CK#.
CKE Input Clock enable: CKE enables (registered HIGH) and disables (registered LOW) internal
circuitry and clocks on the DRAM. The specific circuitry that is enabled/disabled is de-
pendent upon the DDR3 SDRAM configuration and operating mode. Taking CKE
LOW provides PRECHARGE POWER-DOWN and SELF REFRESH operations (all banks
idle),or active power-down (row active in any bank). CKE is synchronous for power-
down entry and exit and for self refresh entry. CKE is asynchronous for self refresh
exit. Input buffers (excluding CK, CK#, CKE, RESET#, and ODT) are disabled during
POWER-DOWN. Input buffers (excluding CKE and RESET#) are disabled during SELF
REFRESH. CKE is referenced to V
REFCA
.
CS# Input Chip select: CS# enables (registered LOW) and disables (registered HIGH) the
command decoder. All commands are masked when CS# is registered HIGH. CS# pro-
vides for external rank selection on systems with multiple ranks. CS# is considered
part of the command code. CS# is referenced to V
REFCA
.
LDM Input Input data mask: LDM is a lower-byte, input mask signal for write data. Lower-byte
input data is masked when LDM is sampled HIGH along with the input data during a
write access. Although the LDM ball is input-only, the LDM loading is
designed to match that of the DQ and DQS balls. LDM is referenced to V
REFDQ
.
ODT Input On-die termination: ODT enables (registered HIGH) and disables (registered LOW)
termination resistance internal to the DDR3 SDRAM. When enabled in normal
operation, ODT is only applied to each of the following balls: DQ[15:0], LDQS,
LDQS#, UDQS, UDQS#, LDM, and UDM for the x16; DQ0[7:0], DQS, DQS#, DM/TDQS,
and NF/TDQS# (when TDQS is enabled) for the x8; DQ[3:0], DQS, DQS#, and DM for
the x4. The ODT input is ignored if disabled via the LOAD MODE command. ODT is
referenced to V
REFCA
.
RAS#, CAS#, WE# Input Command inputs: RAS#, CAS#, and WE# (along with CS#) define the command
being entered and are referenced to V
REFCA
.
8Gb: x4, x8, x16 DDR3L SDRAM
Ball Assignments and Descriptions
20
Rev.2.0 June 2016
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