Registers
Device:
NodeID
Function: 3
Offset:
40h
Bit
Attr
Default
Description
11:10
RW
00
FAST: Address sequencing
00 => addressing with XZY toggling (column->bank->row)
01 => Fast Y with fixed bank
10 => Fast X with fixed bank
11 => Fast XY with fixed bank
9:8
RW
00
DTYPE: Data type selection:
00 => Fixed data pattern, selected by MBCSR bits 18:16
01 => 144 or 288 bits user defined data
10 => Circular shift data
11 => LFSR data, seeded from 32 bit LFSR seed register.
Note: Algorithm mode only supports DTYPE = Fixed
Note: Circular shift data and LFSR data type should not be used for single address
operation (ATYPE = 01).
7:6
RW
00
ATYPE: Address type
00 => Reserved
01 => Single physical address operation, contained in MBADDR row/column/
bank.
10 => start/end physical address range defined in MB_START_ADDR &
MB_END_ADDR registers.
•
In FastX, FastY and FastXY modes, only the bank specified in
MB_START_ADDR will be exercised.
11 => full address range of the DIMM as defined in MTR register which specifies
the number of banks, rows, and columns.
•
In FastX, FastY and FastXY modes, only the bank 0 will be exercised.
5:4
3:0
RW
RV
00
0
CMD: Command execution:
00 => Read only without data comparison
01 => Write only
10 => Read with data comparison
11 => Write followed by Read with data comparison
Reserved
Algorithms:
When Embedded algorithm is applied, please program the following bits at the same
time.
1. Select MBCSR.cmd bit[5:4] for the initial command execution mode.
For all algorithm choices except for Data Retention Read, select "01: write only".
For Data Retention Read, select "10: read with data comparison".
2. Program MBCSR.fast bit[11:10] to select FastX, FastY, FastXY, or XZY.
3. Program proper start/end address registers and corresponding MTR value for DIMM
type. Do not leave start and end address register as default "00" or the same
value. Algorithm does not support single or full address modes.
14.5.2.2
MBADDR: Memory Test Address
The register is used by MemBIST only when testing to a single memory location.
(MBCSR.atype = 2b‘01)
Intel® 6400/6402 Advanced Memory Buffer Datasheet
193
INTEL [ INTEL ]
