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7
16, 32 Meg x 72 PC133/PC100 Registered SDRAM DIMMs Micron Technology, Inc., reserves the right to change products or specifications without notice.
SD9C16_32X72G_A.p65 – Rev. 4/02 ©2001, Micron Technology, Inc.
128MB / 256MB (x72)
168-PIN REGISTERED SDRAM DIMMs
SDRAM FUNCTIONAL DESCRIPTION
In general, the 128Mb and 256Mb SDRAM memory
devices used for these modules are quad-bank DRAMs,
that operate at 3.3V and include a synchronous inter-
face (all signals are registered on the positive edge of the
clock signal, CLK). The four banks of a x8, 128Mb device
are each configured as 4,096 bit-rows, by 1,024 bit-
columns, by 8 input/output bits. The four banks of a x8,
256Mb device are configured as 8,192 bit-rows by 1,024
bit columns, by 8 input/output bits.
Read and write accesses to the SDRAM are burst
oriented; accesses start at a selected location and con-
tinue for a programmed number of locations in a
programmed sequence. Accesses begin with the registra-
tion of an ACTIVE command, which is then followed
by a READ or WRITE command. The address bits
registered coincident with the ACTIVE command are
used to select the device bank and row to be accessed
BA0 and BA1 select the device bank, A0-A11 (for
128Mb), or A0-A12 (for 256Mb), select the device row.
The address bits A0-A9, registered coincident with the
READ or WRITE command are used to select the
starting device column location for the burst access.
Prior to normal operation, the SDRAM must be
initialized. The following sections provide detailed
information covering device initialization, register defi-
nition, command descriptions and device operation.
Initialization
SDRAMs must be powered up and initialized in a
predefined manner. Operational procedures other than
those specified may result in undefined operation.
Once power is applied to VDD and VDDQ (simulta-
neously) and the clock is stable (stable clock is defined
as a signal cycling within timing constraints specified
for the clock pin), the SDRAM requires a 100µs delay
prior to issuing any command other than a COM-
MAND INHIBIT or NOP. Starting at some point during
this 100µs period and continuing at least through the
end of this period, COMMAND INHIBIT or NOP
commands should be applied.
Once the 100µs delay has been satisfied with at least
one COMMAND INHIBIT or NOP command having
been applied, a PRECHARGE command should be
applied. All device banks must then be precharged,
thereby placing the device in the all banks idle state.
Once in the idle state, two AUTO REFRESH cycles
must be performed. After the AUTO REFRESH cycles are
complete, the SDRAM is ready for mode register pro-
gramming. Because the mode register will power up in
an unknown state, it should be loaded prior to apply-
ing any operational command.
Mode Register Definition
MODE REGISTER
The mode register is used to define the specific mode
of operation of the SDRAM. This definition includes
the selection of a burst length, a burst type, a CAS
latency, an operating mode and a write burst mode, as
shown in the Mode Register Definition Diagram (p. 9).
The mode register is programmed via the LOAD MODE
REGISTER command and will retain the stored infor-
mation until it is programmed again or the device loses
power.
Mode register bits M0-M2 specify the burst length,
M3 specifies the type of burst (sequential or inter-
leaved), M4-M6 specify the CAS latency, M7 and M8
specify the operating mode, M9 specifies the write burst
mode, and M10 and M11 are reserved for future use.
The mode register must be loaded when all device
banks are idle, and the controller must wait the specified
time before initiating the subsequent operation. Violat-
ing either of these requirements will result in unspecified
operation.
Burst Length
Read and write accesses to the SDRAM are burst
oriented, with the burst length being programmable, as
shown in the Mode Register Definition Diagram (p. 9).
The burst length determines the maximum number of
column locations that can be accessed for a given READ
or WRITE command. Burst lengths of 1, 2, 4, or 8
locations are available for both the sequential and the
interleaved burst types, and a full-page burst is available
for the sequential type. The full-page burst is used in
conjunction with the BURST TERMINATE command
to generate arbitrary burst lengths.
Reserved states should not be used, as unknown
operation or incompatibility with future versions may
result.
When a READ or WRITE command is issued, a block
of columns equal to the burst length is effectively
selected. All accesses for that burst take place within this
block, meaning that the burst will wrap within the block
if a boundary is reached, as shown in the Burst Defini-
tion Table (p. 9). The block is uniquely selected by A1-
A9 when the burst length is set to two; A2-A9 when the
burst length is set to four; and by A3-A9 when the burst
length is set to eight. The remaining (least significant)
address bit(s) is (are) used to select the starting location
within the block. Full-page bursts wrap within the page
if the boundary is reached.