Description
The 128Mb DDR SDRAM uses a double-data-rate architecture to achieve high-speed operation.
The double data rate architecture is essentially a 2n prefetch architecture with an interface designed to transfer two data words per clock cycle at the I/O pins.
Features
- CAS Latency and Frequency
CAS Latency
2 2.5 3
Maximum Operating Frequency (MHz) DDR400 (5) 133 166 200.
- Double data rate architecture: two data transfers per clock cycle.
- Bidirectional data strobe (DQS) is transmitted and received with data, to be used in capturing data at the receiver.
- DQS is edge-aligned with data for reads and is centeraligned with data for writes.
- Differential clock inputs (CK and CK ).
- Four internal banks for concurrent op.