EM639325
EtronTech
Figure 5. Burst Read Operation
(Burst Length = 4, CAS# Latency = 2, 3)
T3 T4 T5 T6 T7 T8
T0
T1
T2
CLK
NOP
READ A
NOP
NOP
NOP
NOP
NOP
NOP
NOP
COMMAND
CAS# latency=2
tCK2, DQ
DOUT A0 DOUT A1 DOUT A2 DOUT A3
CAS# latency=3
tCK3, DQ
DOUT A0 DOUT A1 DOUT A2 DOUT A3
The read data appears on the DQs subject to the values on the DQM inputs two clocks earlier (i.e.
DQM latency is two clocks for output buffers). A read burst without the auto precharge function may
be interrupted by a subsequent Read or Write command to the same bank or the other active bank
before the end of the burst length. It may be interrupted by a BankPrecharge/ PrechargeAll
command to the same bank too. The interrupt coming from the Read command can occur on any
clock cycle following a previous Read command (refer to the following figure).
Figure 6. Read Interrupted by a Read
(Burst Length = 4, CAS# Latency = 2, 3)
T0
T1
T2
T3
T4
T5
T6
T7
T8
CLK
COMMAND
READ A
NOP
NOP
NOP
NOP
NOP
NOP
NOP
READ B
CAS# latency=2
DOUT A0
DOUT B0
DOUT A0
DOUT B1
DOUT B0
DOUT B2 DOUT B3
t
CK2, DQ
CAS# latency=3
CK3, DQ
DOUT B1
DOUT B2 DOUT B3
t
The DQM inputs are used to avoid I/O contention on the DQ pins when the interrupt comes from
a Write command. The DQMs must be asserted (HIGH) at least two clocks prior to the Write
command to suppress data-out on the DQ pins. To guarantee the DQ pins against I/O contention, a
single cycle with high-impedance on the DQ pins must occur between the last read data and the
Write command (refer to the following figure). If the data output of the burst read occurs at the
second clock of the burst write, the DQMs must be asserted (HIGH) at least one clock prior to the
Write command to avoid internal bus contention.
Rev. 2.1
9
Aug. /2015