DDR MemBIST
Figure 11-2. Fast Y Address Sequencing
One Bank
Address space as set by values in MTR register
Address space as set by start and end values in
MB_START_ADDR and MB_END_ADDR registers
E
13
7
14
8
15
9
16
10
4
17
11
5
18
12
6
S
2
3
1
Increasing X
0
0
Increasing Y
0001
Fast Y address sequencing, increasing
address, specified address range
11.3.2.4.2
Fast X
Figure 11-3 below depicts how Fast X with decrementing addresses cycles through a
range of addresses specified by MB_START_ADDR and MB_END_ADDR. In this
execution mode, Z, or bank address, is held constant (except in the case of dynamic
address inversion mode, DAI, mentioned later). Note that the X address counter
counts down from Xe to Xs before decrementing the Y address counter and beginning
again at Xe. This process continues until both the X and Y address counters reach their
end Xs and Ys values simultaneously. This ending condition results in the address range
being covered once. The name “Fast X” is descriptive of this testing order in which the
X address range changes faster than the Y address range.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
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INTEL [ INTEL ]
