EMD28164PA Emlsi Inc., EMD28164PA Datasheet - Page 22

• Manufacturer Part Number: EMD28164PA
• Description: 128m 8m X 16 Mobile Ddr Sdram
• Manufacturer: Emlsi Inc.

Operations
Bank/Row Activation
The Bank Activation command is issued by holding /CAS and /WE high with /CS and /RAS low at the rising edge of the
clock(CK). The DDR SDRAM has four independent banks, so two bank select addresses(BA0, BA1) are required. The
Bank Activation command must be applied before any READ or WRITE operation is executed. The delay from the
Bank Activation command to the first READ or WRITE command must meet or exceed the minimum of RAS to CAS
delay time(tRCD min). Once a bank has been activated, it must be precharged before another Bank Activation com-
mand can be applied to the same bank. The minimum time interval between interleaved Bank Activation com-
mands(Bank A to Bank B and vice versa) is the Bank to Bank delay time(tRRD min).
Command
Address
Bank Activation Command Cycle
CK
/CK
Row Address
Activate
Bank A
Bank A
0
RAS - CAS delay(t
NOP
1
NOP
RCD
2
)
Precharge
Col. Addr.
with Auto
Bank A
Write
3
Row Cycle Time(tRC)
22
Row Addr.
128M: 8M x 16 Mobile DDR SDRAM
Activate
Bank B
Bank B
RAS - RAS delay time(t
Tn
NOP
EMD28164PA
Tn+1
Row. Addr.
RRD
Activate
Bank A
Bank A
)
Tn+2
Rev 1.0
: Don't care