IS42S16400D-6TLI-TR ISSI, Integrated Silicon Solution Inc, IS42S16400D-6TLI-TR Datasheet - Page 21

• Manufacturer Part Number: IS42S16400D-6TLI-TR
• Description: IC SDRAM 64MBIT 166MHZ 54TSOP
• Manufacturer: ISSI, Integrated Silicon Solution Inc

Specifications of IS42S16400D-6TLI-TR

• Format - Memory: RAM
• Memory Type: SDRAM
• Memory Size: 64M (4M x 16)
• Speed: 166MHz
• Interface: Parallel
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 54-TSOP II
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

IS42S16400D
READS
READ bursts are initiated with a READ command, as
shown in the READ COMMAND diagram.
The starting column and bank addresses are provided with
the READ command, and auto precharge is either enabled
or disabled for that burst access. If auto precharge is
enabled, the row being accessed is precharged at the
completion of the burst. For the generic READ commands
used in the following illustrations, auto precharge is disabled.
During READ bursts, the valid data-out element from the
starting column address will be available following the
CAS latency after the READ command. Each subsequent
data-out element will be valid by the next positive clock
edge. The CAS Latency diagram shows general timing
for each possible CAS latency setting.
Upon completion of a burst, assuming no other commands
have been initiated, the DQs will go High-Z. A full-page
burst will continue until terminated. (At the end of the page,
it will wrap to column 0 and continue.)
Data from any READ burst may be truncated with a
subsequent READ command, and data from a fixed-length
READ burst may be immediately followed by data from a
READ command. In either case, a continuous flow of data
can be maintained. The first data element from the new
burst follows either the last element of a completed burst or
the last desired data element of a longer burst which is
being truncated.
The new READ command should be issued x cycles
before the clock edge at which the last desired data
element is valid, where x equals the CAS latency minus
one. This is shown in Consecutive READ Bursts for CAS
latencies of two and three; data element n + 3 is either the
last of a burst of four or the last desired of a longer burst.
The 64Mb SDRAM uses a pipelined architecture and
therefore does not require the 2n rule associated with a
prefetch architecture. A READ command can be initiated
on any clock cycle following a previous READ command.
Full-speed random read accesses can be performed to the
same bank, as shown in Random READ Accesses, or each
subsequent READ may be performed to a different bank.
Data from any READ burst may be truncated with a
subsequent WRITE command, and data from a fixed-length
READ burst may be immediately followed by data from a
WRITE command (subject to bus turnaround limitations).
The WRITE burst may be initiated on the clock edge
immediately following the last (or last desired) data
element from the READ burst, provided that I/O contention
can be avoided. In a given system design, there may be
a possibility that the device driving the input data will go
Low-Z before the SDRAM DQs go High-Z. In this case, at
least a single-cycle delay should occur between the last
read data and the WRITE command.
Integrated Silicon Solution, Inc. — www.issi.com
Rev. E
11/21/07
READ COMMAND
The DQM input is used to avoid I/O contention, as shown
in Figures RW1 and RW2. The DQM signal must be
asserted (HIGH) at least three clocks prior to the WRITE
command (DQM latency is two clocks for output buffers)
to suppress data-out from the READ. Once the WRITE
command is registered, the DQs will go High-Z (or remain
High-Z), regardless of the state of the DQM signal,
provided the DQM was active on the clock just prior to the
WRITE command that truncated the READ command. If
not, the second WRITE will be an invalid WRITE. For
example, if DQM was LOW during T4 in Figure RW2, then
the WRITEs at T5 and T7 would be valid, while the WRITE
at T6 would be invalid.
The DQM signal must be de-asserted prior to the WRITE
command (DQM latency is zero clocks for input buffers)
to ensure that the written data is not masked.
A fixed-length READ burst may be followed by, or truncated
with, a PRECHARGE command to the same bank (provided
that auto precharge was not activated), and a full-page burst
may be truncated with a PRECHARGE command to the
same bank. The PRECHARGE command should be issued
x cycles before the clock edge at which the last desired data
element is valid, where x equals the CAS latency minus one.
This is shown in the READ to PRECHARGE diagram for each
A8, A9, A11
BA0, BA1
A0-A7
CKE
RAS
CAS
CLK
A10
WE
CS
HIGH-Z
AUTO PRECHARGE
COLUMN ADDRESS
NO PRECHARGE
BANK ADDRESS
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