DDR MemBIST
Figure 11-4. Fast XY Address Sequencing Examples
Fast XY Examples
BL = 4, incrementing addresses
Y (Columns)
Y (Columns)
X
X
0
4
8
C
0
4
8
C
10
(Rows)
(Rows)
S
S
0
1
2
3
0
1
2
3
---
---
---
17
13
9
5
1
1
---
---
---
2
---
3
---
---
6
2
7
18
3
14
19
4
10
15
---
---
11
16
E
4
E
20
---
12
8
Y (Columns)
X
0
4
8
C
(Rows)
S
0
1
---
3
---
1
E
4
---
2
---
Numbers inside of cells indicate order of access.
--- inside a cell indicates that cell is not accessed.
0001
11.3.2.4.4
XZY Addressing
In XZY (range) address sequencing the MSB-to-LSB ordering of the address counters is
Row, Bank, Column, although this is not the order of the fields in the registers used for
address specification for MemBIST. As a result of this ordering of the counters, first the
columns in one row in the starting bank will be accessed, followed by those on the
same row in the second bank, and so on until that row in all banks has been accessed.
Then the columns in the next row in the first bank will be selected and the process
continued.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
121
INTEL [ INTEL ]
