Atmel Evaluation Kit for AT32uC3A0512, 32-Bit AVR Microcontroller Atmel ATEVK1105 ATEVK1105 데이터 시트
제품 코드
ATEVK1105
410
AT32UC3A
28. SDRAM Controller (SDRAMC)
Rev: 2.0.1.1
28.1
Features
•
Numerous Configurations Supported
– 2K, 4K, 8K Row Address Memory Parts
– SDRAM with Two or Four Internal Banks
– SDRAM with 16- or 32-bit Data Path
•
Programming Facilities
– Word, Half-word, Byte Access
– Automatic Page Break When Memory Boundary Has Been Reached
– Multibank Ping-pong Access
– Timing Parameters Specified by Software
– Automatic Refresh Operation, Refresh Rate is Programmable
– Automatic Update of DS, TCR and PASR Parameters (Mobile SDRAM Devices)
•
Energy-saving Capabilities
– Self-refresh, Power-down and Deep Power Modes Supported
– Supports Mobile SDRAM Devices
•
Error Detection
– Refresh Error Interrupt
•
SDRAM Power-up Initialization by Software
•
CAS Latency of 1, 2, 3 Supported
•
Auto Precharge Command Not Used
28.2
Description
The SDRAM Controller (SDRAMC) extends the memory capabilities of a chip by providing the
interface to an external 16-bit or 32-bit SDRAM device. The page size supports ranges from
2048 to 8192 and the number of columns from 256 to 2048. It supports byte (8-bit), half-word
(16-bit) and word (32-bit) accesses.
The SDRAM Controller supports a read or write burst length of one location. It keeps track of the
The SDRAM Controller supports a read or write burst length of one location. It keeps track of the
active row in each bank, thus maximizing SDRAM performance, e.g., the application may be
placed in one bank and data in the other banks. So as to optimize performance, it is advisable to
avoid accessing different rows in the same bank.
The SDRAM controller supports a CAS latency of 1, 2 or 3 and optimizes the read access
The SDRAM controller supports a CAS latency of 1, 2 or 3 and optimizes the read access
depending on the frequency.
The different modes available - self-refresh, power-down and deep power-down modes - mini-
The different modes available - self-refresh, power-down and deep power-down modes - mini-
mize power consumption on the SDRAM device.
32058K
AVR32-01/12