82G33 datasheet(152/437 Pages) INTEL

152 / 437 page

DRAM Controller Registers (D0:F0)

152

Datasheet

Bit

Access &

Default

Description

Refresh Counter Enable (REFCNTEN): This bit is used to enable the

refresh counter to count during times that DRAM is not in self-refresh,

but refreshes are not enabled. Such a condition may occur due to need

to reprogram DIMMs following DRAM controller switch.

This bit has no effect when Refresh is enabled (i.e., there is no mode

where Refresh is enabled but the counter does not run). Thus, in

conjunction with bit 23 REFEN, the modes are:

REFEN:REFCNTEN

Description

0:0

Normal refresh disable

0:1

Refresh disabled, but counter is accumulating

refreshes.

1:X

Normal refresh enable

All Rank Refresh (ALLRKREF): This configuration bit enables (by

default) that all the ranks are refreshed in a staggered/atomic fashion.

If set, the ranks are refreshed in an independent fashion.

Refresh Enable (REFEN): Refresh is enabled.

0 = Disabled

1 = Enabled

DDR Initialization Done (INITDONE): Indicates that DDR

initialization is complete.

0 = Not Done

1 = Done

21:20

00b

DRAM Refresh Hysterisis (REFHYSTERISIS): Hysterisis level -

Useful for dref_high watermark cases. The dref_high flag is set when

the dref_high watermark level is exceeded, and is cleared when the

refresh count is less than the hysterisis level. This field should be set to

a value less than the high watermark level.

00 = 3

01 = 4

10 = 5

11 = 6

19:18

00b

DRAM Refresh Panic Watermark (REFPANICWM): When the

refresh count exceeds this level, a refresh request is launched to the

scheduler and the dref_panic flag is set.

00 = 5

01 = 6

10 = 7

11 = 8

17:16

00b

DRAM Refresh High Watermark (REFHIGHWM): When the refresh

count exceeds this level, a refresh request is launched to the scheduler

and the dref_high flag is set.

00 = 3

01 = 4

10 = 5

11 = 6

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