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DDR MemBIST

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Intel® 6400/6402 Advanced Memory Buffer Datasheet

11.3.2.3

Address Space

The address space for MemBIST is selected using the MBCSR:atype field. The choices

include a single physical address specified in the MBADDR register, a range of

addresses as specified using the MB_START_ADDR and MB_END_ADDR registers, and

the full address space of the DRAMs as specified in the MTR register. The range and full

address spaces are depicted in the next figure, Figure 11-1.

Table 11-4. MemBIST Addressing Behavior

Address Type (MBSCR:atype)

Address

Sequencing

(MBCSR:fast)

Range (specified in

MB_START_ADDR

and MB_END_ADDRa)

Notes:

It is required that Xs < Xe, Ys < Ye and Zs < Ze. Xs, Zs, Ys and Xe, Ze, Ye are the values in MB_START_ADDR and

MB_END_ADDR respectively

Full (uses range of 0 to MTR

limit)

Single (specified in MBADDR)

XZY

Counter orderb XZY

X, Y increment3 start to end

X, Y decrement3 end to start

Z increments Zs to Ze if Zs < Ze

Z decrements Ze to Zs if Zs < Ze

Following is for Intel 6400/6402

Advanced Memory Buffer only

and not required by the FBD

DFx Spec

Z fixed at Zs if Zs = Ze

Z increments Zs to MTR limit,

wraps to 0, then to Ze if Zs >

Ze. Ze to Zs is skipped.

• Z decrements Ze to 0,

wraps to MTR limit, then to

Zs if Zs > Ze. Ze to Zs is

skipped.

Counter order is counter MSB to LSB in the order given.

Counter order XZY

X, Y, Z incrementc 0 to MTR limitd

X, Y, Z decrement MTR limit to 0

Increment or decrement is selected using MBCSR:adir

MTR limit is the value shown in MTR for this address and refers to the top of this address range.

Single burst to address specified

in MBADDR

MBCSR:fast ignored

Fast Y

Counter order XY

X, Y increment start to end

X, Y decrement end to start

Z fixed at Zs. Ze is ignored.

Counter order XY

X, Y increment 0 to MTR limit

X, Y decrement MTR limit to 0

Z fixed at 0

Fast X

Counter order YX

X, Y increment start to end

X, Y decrement end to start

Z fixed at Zs. Ze is ignored

Counter order YX

X, Y increment 0 to MTR limit

X, Y decrement MTR limit to 0

Z fixed at 0

Fast XY

X and Y count simultaneously

X, Y increment start to end

X, Y decrement end to start

Z fixed at Zs. Ze is ignored

X and Y count simultaneously

X, Y increment 0 to MTR limit

X, Y decrement MTR limit to 0

Z fixed at 0

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