Datasheet

Datasheet 117
DRAM Controller Registers (D0:F0)
5.2.24 C1CYCTRKACT—Channel 1 CYCTRK ACT
B/D/F/Type: 0/0/0/MCHBAR
Address Offset: 652–655h
Default Value: 00000000h
Access: RO, RW
Size: 32 bits
Channel 1 CYCTRK ACT registers.
Bit Access
Default
Value
Description
31:28 RO 0h Reserved
27:22 RW 000000b
ACT Window Count (C1sd_cr_act_windowcnt): This field indicates the
window duration (in DRAM clocks) during which the controller counts the # of
activate commands which are launched to a particular rank. If the number of
activate commands launched within this window is greater than 4, then a check
is implemented to block launch of further activates to this rank for the rest of the
duration of this window.
21 RW 0b
Max ACT Check Disable (C1sd_cr_maxact_dischk):This field enables the
check which ensures that there are no more than four activates to a particular
rank in a given window.
20:17 RW 0000b
ACT to ACT Delayed (C1sd_cr_act_act[): This field indicates the minimum
allowed spacing (in DRAM clocks) between two ACT commands to the same
rank. Corresponds to t
RRD
in the DDR Specification.
16:13 RW 0000b
PRE to ACT Delayed (C1sd_cr_pre_act): This field indicates the minimum
allowed spacing (in DRAM clocks) between the PRE and ACT commands to the
same rank-bank:12:9R/W0000bPRE-ALL to ACT Delayed
(C1sd_cr_preall_act):This field indicates the minimum allowed spacing (in DRAM
clocks) between the PRE-ALL and ACT commands to the same rank. This field
corresponds to t
RP
in the DDR Specification.
12:9 RW 0h
ALLPRE to ACT Delay (C1sd_cr_preall_act): From the launch of a
prechargeall command wait for these many # of mclks before launching a
activate command. This field corresponds to t
PALL_RP
.
8:0 RW
0000000
00b
REF to ACT Delayed (C1sd_cr_rfsh_act): This field indicates the minimum
allowed spacing (in DRAM clocks) between REF and ACT commands to the same
rank. This field corresponds to t
RFC
in the DDR Specification.