HYB18M1G320BF QIMONDA [Qimonda AG], HYB18M1G320BF Datasheet - Page 10

• Manufacturer Part Number: HYB18M1G320BF
• Description: DRAMs for Mobile Applications 1-Gbit x32 DDR Mobile-RAM
• Manufacturer: QIMONDA [Qimonda AG]

2.2
2.2.1
The Mode Register is used to define the specific mode of operation of the DDR Mobile-RAM. This definition includes the
selection of a burst length (bits A0-A2), a burst type (bit A3) and a CAS latency (bits A4-A6). The Mode Register is programmed
via the MODE REGISTER SET command (with BA0 = 0 and BA1 = 0) and will retain the stored information until it is
programmed again or the device loses power.
The Mode Register must be loaded when all banks are idle, and the controller must wait the specified time before initiating any
subsequent operation. Violating either of these requirements results in unspecified operation.
Reserved states should not be used, as unknown operation or incompatibility with future versions may result.
Mode Register Definition (BA[1:0] = 00
Rev.1.00, 2007-03
02022006-J7N7-GYFP
Field
CL
BT
BL
Bits
[6:4]
3
[2:0]
Type
w
w
w
Register Definition
Mode Register
Description
CAS Latency
010
011
Note: All other bit combinations are RESERVED.
Burst Type
0
1
Burst Length
001
010
011
100
Note: All other bit combinations are RESERVED.
B
B
B
B
B
B
B
B
CL 2
CL 3
BT Sequential
BT Interleaved
BL 2
BL 4
BL 8
BL 16
B
)
10
1-Gbit DDR Mobile-RAM
HY[B/E]18M1G320BF
Data Sheet