參數(shù)資料
型號(hào): HYB18T512400AF-3S
廠商: INFINEON TECHNOLOGIES AG
英文描述: 512-Mbit DDR2 SDRAM
中文描述: 512兆位DDR2 SDRAM的
文件頁數(shù): 31/117頁
文件大小: 2102K
代理商: HYB18T512400AF-3S
Data Sheet
31
Rev. 1.3, 2005-01
09112003-SDM9-IQ3P
HYB18T512[40/80/16]0AF–[3/3S/3.7/5]
512-Mbit DDR2 SDRAM
Functional Description
3.6
DDR2 SDRAM Extended Mode Register Set (MRS)
The Extended Mode Register EMR(1) stores the data
for enabling or disabling the DLL, output driver
strength, additive latency, OCD program, ODT, DQS
and output buffers disable, RQDS and RDQS enable.
The default value of the extended mode register
EMR(1) is not defined, therefore the extended mode
register must be written after power-up for proper
operation. The extended mode register is written by
asserting low on CS, RAS, CAS, WE, BA1 and high on
BA0, while controlling the state of the address pins
BT
3
w
Burst Type
0
B
BT
, Sequential
1
B
BT
, Interleaved
Burst Length
Note:All other bit combinations are illegal.
BL
[2:0]
w
010
B
BL
, 4
011
B
BL
, 8
1) w = write only register bits
2) Number of clock cycles for write recovery during auto-precharge. WR in clock cycles is calculated by dividing t
WR
(in ns) by
t
CK
(in ns) and rounding up to the next integer: WR [cycles]
t
WR
(ns) / t
CK
(ns). The mode register must be programmed to
fulfill the minimum requirement for the analogue t
WR
timing WR
MIN
is determined by t
CK.MAX
and WR
MAX
is determined by
t
CK.MIN
.
Table 8
Mode Register Definition (BA[2:0] = 000B)
Field
Bits
Type
1)
Description
Table 9
Extended Mode Register Definition (BA[2:0] = 001B)
Field
BA2
Bits
16
Type
1)
reg. addr.
Description
Bank Address [2]
Note:BA2 not available on 256 Mbit and 512 Mbit components
0
B
Bank Address [1]
0
B
BA1
, Bank Address
Bank Address [0]
0
B
BA0
, Bank Address
BA2
, Bank Address
BA1
15
BA0
14
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REG ADDR
W
W
W
W
W
W
W
W
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