ADVANCE
256Mb: x16, x32
2.5V VEXT, 1.8V VDD, 1.8V VDDQ, RLDRAM
PROGRAMMING DESCRIPTION
The following table shows, for three operating frequen-
cies, the different RLDRAM configurations that can be
programmed into the Mode Register. The Read Latency
(RL) values and the Write Latencies (WL) used by the
RLDRAM for the two Burst Lengths (BL) are also indi-
cated. Finally, the minimum allowed tRC in clock cycles
and in ns are shown as well. The shaded areas correspond
to configurations that are not allowed.
RLDRAM Programming Table
FREQUENCY
Unit
-3.3 (300 MHz)
Config. Nb.
12345 6
RL
TCK 5 5 5 6 7 8
WL (BL2) TCK 2 2 2 3 4 5
WL (BL4)
tRC (MIN)
tRC (MIN)
TCK 1 1 1 2 3 4
TCK 5 6 7 8 9 10
ns 16.7 20.0 23.3 26.7 30.0 33.3
-4 (250 MHz)
Config. Nb.
12345 6
RL
TCK 5 5 5 6 7 8
WL (BL2) TCK 2 2 2 3 4 5
WL (BL4) TCK 1 1 1 2 3 4
tRC (MIN) TCK 5
6
7
8
9 10
tRC (MIN) ns 20 24 28 32 36 40
-5 (200 MHz)
Config. Nb.
12345 6
RL
TCK 5 5 5 6 7 8
WL (BL2) TCK 2 2 2 3 4 5
WL (BL4) TCK 1 1 1 2 3 4
tRC (MIN) TCK 5
6
7
8
9 10
tRC (MIN) ns 25 30 35 40 45 50
NOTE: 1. The speed sort -3.3 provides part functional up to 300 MHz in the configurations 4, 5,
and 6 only.
The functionality of the configurations 1, 2, and 3 is not guaranteed for speed sort -
3.3.
2. The speed sort -4 provides part functional up to 250 MHz in the configurations 3, 4, 5,
and 6 only.
The functionality of the configurations 1 and 2 is not guaranteed for speed sort -4.
3. The speed sort -5 provides part functional up to 200 MHz in all configurations.
256: x16, x32 RLDRAM
MT49H8M32_3.p65 – Rev. 3, Pub. 6/02
9
Micron Technology, Inc., reserves the right to change products or specifications without notice.
©2002, Micron Technology, Inc.