82830MP datasheet(71/159 Pages) INTEL

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Intel

® 830MP Chipset

298338-001

Datasheet

4.5.1.25

ESMRAMC - Extended System Management RAM Control Register -

Device #0

Address Offset:

91h

Default Value:

38h

Access:

Read/Write

Size:

8 bits

The Extended SMRAM register controls the configuration of Extended SMRAM space. The Extended

SMRAM (E_SMRAM) memory provides a write-back cacheable SMRAM memory space that is above

1 MB.

Bit

Description

H_SMRAM_EN (H_SMRAME): Controls the SMM memory space location (i.e. above 1 MB or below

1MB) When G_SMRAME is 1 and H_SMRAME this bit is set to 1, the high SMRAM memory space is

enabled. SMRAM accesses from 0FEDA0000h to 0FEDBFFFFh are remapped to SDRAM address

000A0000h to 000BFFFFh.

Once D_LCK is set, this bit becomes read only.

Default Value=0.

E_SMRAM_ERR (E_SMERR): This bit is set when CPU accesses the defined memory ranges in

Extended SMRAM (High Memory and T-segment) while not in SMM space and with the D-OPEN bit = 0.

It is software’s responsibility to clear this bit. The software must write a 1 to this bit to clear it

Default Value=0.

SMRAM_Cache (SM_CACHE): This bit is forced to ‘1’ by the GMCH-M .

Default Value=1.

SMRAM_L1_EN (SM_L1): This bit is forced to ‘1’ by the GMCH-M.

Default Value=1.

SMRAM_L2_EN (SM_L2): This bit is forced to ‘1’ by the GMCH-M.

Default Value=1.

Reserved

TSEG_SZ(T_SZ): Selects the size of the TSEG memory block if enabled. This memory is taken from

the top of SDRAM space (i.e. TOM - TSEG_SZ), which is no longer claimed by the memory controller.

This field decodes as follows:

TSEG_SZ

Description

(TOM-512K) to TOM

(TOM-1M) to TOM

Once D_LCK is set, this bit becomes read only.

Default Value=0.

TSEG_EN (T_EN): Enabling of SMRAM memory (TSEG, 512 Kbytes or 1 Mbytes of additional SMRAM

memory) for Extended SMRAM space only. When G_SMRAME =1 and TSEG_EN = 1, the TSEG is

enabled to appear in the appropriate physical address space.

Once D_LCK is set, this bit becomes read only.

Default Value=0.

82830MP Datasheet(PDF) 71 Page - Intel Corporation

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