6402 datasheet(122/250 Pages) INTEL

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Intel® 6400/6402 Advanced Memory Buffer Datasheet

11.3.2.4.5

Dynamic Address Inversion (DAI):

Dynamic address inversion (DAI) is provided to maximize the switching of address lines

during testing. When dynamic address inversion is enabled, the address counters

increment or decrement as usual, but every other address driven to the DRAMs is the

logical inverse of the previous address used. The least significant address bit is not

inverted since it already toggles at the address rate.

All address lines (X, Y and Z) are inverted by DAI, creating a ping-pong access pattern.

This occurs in all address sequencing modes. This behavior might lead to accesses in

unexpected portions of the address space. For example, DAI inverts the bank address

lines even in Fast X, Fast Y and Fast XY modes, which normally have fixed bank

addresses. As a result, every other access is to a different bank than the fixed bank

selected by the addressing mode (either MB_START_ADDR:ba field or bank 0 for range

or full addressing respectively). Between each access, the old bank must be closed and

the new bank must be activated. In another example, with XZY address sequencing

and range addressing, it is normal to think of accesses as being restricted to the

address range specified in MB_START_ADDR and MB_END_ADDR. But with DAI

enabled, the non-inverted accesses will be within the specified range, but the inverted

accesses could possibly fall outside of the specified address range.

DAI can be used with any address sequencing mode. It can also be used with either

incrementing or decrementing addresses. Table 11-5 gives an example of both address

incrementing and address decrementing in DAI mode. This example is of XZY address

sequencing with range addressing and shows only low-order bank and column address

lines. Shaded rows are non-inverted, non-shaded rows show inverted addresses.

Table 11-5. Dynamic Address Inversion, XZY Address Sequencing and Range Addressing

Normal

DAI, incrementing address

DAI, decrementing address

Bank

Column

Bank

Column

Bank

Column

001

111

000

011

101

010

101

011

100

111

001

110

001

111

000

011

101

010

101

011

100

111

001

110

001

111

000

Etc.

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