EDD12322GBH-6ETS-F ELPIDA [Elpida Memory], EDD12322GBH-6ETS-F Datasheet - Page 22

• Manufacturer Part Number: EDD12322GBH-6ETS-F
• Manufacturer: ELPIDA [Elpida Memory]

Mode Register and Extended Mode Register Set
There are two mode registers, the mode register and the extended mode register so as to define the operating
mode. Parameters are set to both through the A0 to the A11 and BA0 and BA1 pins by the mode register set
command [MRS] or the extended mode register set command [EMRS]. The mode register and the extended mode
register are set by inputting signal via the A0 to the A11 and BA0 and BA1 pins during mode register set cycles.
BA0 and BA1 determine which one of the mode register or the extended mode register are set. Prior to a read or a
write operation, the mode register must be set.
Mode Register
The mode register has four fields;
Reserved
/CAS latency
Burst type
Burst length
Following mode register programming, no command can be issued before at least 2 clocks have elapsed.
/CAS Latency
/CAS latency must be set to 3.
Burst Length
Burst Length is the number of words that will be output or input in a read or write cycle. After a read burst is
completed, the output bus will become high-Z. The burst length is programmable as 2, 4, 8 and 16.
Burst Type (Burst Sequence)
The burst type specifies the order in which the burst data will be addressed. This order is programmable as either
“Sequential” or “Interleave”. “Burst Operation” shows the addressing sequence for each burst length for each burst
type.
Preliminary Data Sheet E1530E20 (Ver. 2.0)
BA0
0
MRS
: A11 through A7
: A6 through A4
: A3
: A2 through A0
BA1
0
A6 A5 A4 CAS Latency
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
A11 A10
0
0
1
0
1
0
1
0
1
0
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
3
A9
0
A8
0
Mode Register Set
A3
A7
0 Sequential
1 Interleave
0
Burst Type
A6
22
LMODE
A5
A4
A2 A1 A0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
A3
BT
0
1
0
1
0
1
0
1
A2
Reserved
Reserved
Reserved
Reserved
BT = 0
Burst Length
16
2
4
8
A1
BL
EDD12322GBH-TS
A0
Reserved
Reserved
Reserved
Reserved
BT = 1
16
2
4
8