K4Y50164UC Datasheet, PDF (16/76 Pages) Samsung semiconductor – 512Mbit XDR TM DRAM(C-die)

K4Y50164UC
K4Y50084UC
K4Y50044UC
K4Y50024UC
XDR^TM DRAM
The REFH/M/L registers are also refreshed to as the REFr registers. Note that only the bits that are needed for specifying the refresh
row(11 bits in all) are implemented in the REFr registers - the rest are reserved. Note also that the RA2 ... RA0 field that specifies the
refresh bank address is also referred to as BR2...0. See “Refresh Transactions” on page 42.
Table6 shows the POP field encoding in the ROWP packet. The first encoding specifies a NOPP(no operation) command. There are four
variations of PRE(precharge) command. Each uses the BP field to specify the bank to be precharged. Each also specifies a different
delay of up to 3*t_CYCLE using the POP[1:0] field. A precharge command may be specified in addition to a refresh command using the
ROP field.
Table 6 : POP Field Encoding Summary
POP [2:0] Command
Description
000 NOPP
001 -
010 -
011 -
100 PRE0
101 PRE1
110 PRE2
111 PRE3
No operation.
Reserved.
Reserved.
Reserved.
Row precharge command — Bank BP2..0 is precharged. This command is delayed by 0*t_CYCLE.
Row precharge command — Bank BP2..0 is precharged. This command is delayed by 1*t_CYCLE.
Row precharge command — Bank BP2..0 is precharged. This command is delayed by 2*t_CYCLE.
Row precharge command — Bank BP2..0 is precharged. This command is delayed by 3*t_CYCLE.
Table7 shows the XOP field encoding in the COLX packet. This field encodes the remaining commands.
The CALC and CALE commands perform calibration operations to ensure signal integrity on the Channel. See “Calibration Transactions”
on page 44.
The PDN command causes the device to enter a power-down state. See”Power State Management” on page 45.
XOP
[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
Command
-
-
-
-
-
-
-
-
Table 7 : XOP Field Encoding Summary
Command and Description
Reserved.
Reserved.
Reserved.
Reserved.
Reserved.
Reserved.
Reserved.
Reserved.
XOP
[3:0]
1000
1001
1010
1011
1100
1101
1110
1111
Command
Command and Description
CALC
CALZ
CALE
-
PDN
-
-
-
Current calibration command.
Impedance calibration command.
End calibration command (CALC).
Reserved.
Enter powerdown power state.
Reserved.
Reserved.
Reserved.
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Rev. 1.1 August 2006