Data Sheet.
HY[B/E]18L512160BF-7.5
512-Mbit Mobile-RAM
Burst Length
Starting Column Address
Order of Accesses Within a Burst
A2
A1
A0
Sequential
Interleaved
8
0
0
0
0
1
1
1
1
n
0
0
1
1
0
0
1
1
n
0
1
0
1
0
1
0
1
n
0 - 1 - 2 - 3 - 4 - 5 - 6 - 7
1 - 2 - 3 - 4 - 5 - 6 - 7 - 0
2 - 3 - 4 - 5 - 6 - 7 - 0 - 1
3 - 4 - 5 - 6 - 7 - 0 - 1 - 2
4 - 5 - 6 - 7 - 0 - 1 - 2 - 3
5 - 6 - 7 - 0 - 1 - 2 - 3 - 4
6 - 7 - 0 - 1 - 2 - 3 - 4 - 5
7 - 0 - 1 - 2 - 3 - 4 - 5 - 6
Cn, Cn+1, Cn+2, …
0 - 1 - 2 - 3 - 4 - 5 - 6 - 7
1 - 0 - 3 - 2 - 5 - 4 - 7 - 6
2 - 3 - 0 - 1 - 6 - 7 - 4 - 5
3 - 2 - 1 - 0 - 7 - 6 - 5 - 4
4 - 5 - 6 - 7 - 0 - 1 - 2 - 3
5 - 4 - 7 - 6 - 1 - 0 - 3 - 2
6 - 7 - 4 - 5 - 2 - 3 - 0 - 1
7 - 6 - 5 - 4 - 3 - 2 - 1 - 0
not supported
Full Page
Notes
1. For a burst length of 2, A1-Ai select the two-data-element block; A0 selects the first access within the block.
2. For a burst length of 4, A2-Ai select the four-data-element block; A0-A1 select the first access within the block.
3. For a burst length of 8, A3-Ai select the eight-data-element block; A0-A2 select the first access within the block.
4. For a full page burst, A0-Ai select the starting data element.
5. Whenever a boundary of the block is reached within a given sequence, the following access wraps within the block.
2.2.1.2
Burst Type
Accesses within a given burst may be programmed to be either sequential or interleaved. This is referred to as the burst type
and is selected via bit A3. The ordering of accesses within a burst is determined by:
•
•
•
the burst length
the burst type
the starting column address
This is listed in Table 6.
2.2.1.3
Read Latency
The Read latency, or CAS latency, is the delay, in clock cycles, between the registration of a READ command and the
availability of the first segment of output data. The latency can be programmed to 2 or 3 clocks.
If a READ command is registered at clock edge n, and the latency is m clocks, the data will be available with clock edge n + m
(for more detailed information, please refer to the READ command description).
2.2.1.4
Write Burst Mode
When A9 = 0, the burst length programmed via A0-A2 applies to both read and write bursts; when A9 = 1, write accesses
consist of single data elements only.
Rev. 1.22, 2006-12
11
01132005-06IU-IGVM
QIMONDA [ QIMONDA AG ]
