ATEVK525 Atmel, ATEVK525 Datasheet - Page 17

• Manufacturer Part Number: ATEVK525
• Description: ADD ON KIT FOR STK525
• Manufacturer: Atmel

Specifications of ATEVK525

• Accessory Type: Mass storage
• Silicon Manufacturer: Atmel
• Core Architecture: AVR
• Silicon Core Number: STK525
• Kit Contents: Board CD Docs
• Rohs Compliant: Yes
• For Use With/related Products: STK525
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: STK525 Starter Kit Board
• Lead Free Status / Rohs Status: Supplier Unconfirmed
• Other names: AT89EVK525; AT89EVK525

3.2
3.2.1
3.2.2
ATEVK525 Mass Storage Board for AVR
Performances
Benchmark
Direct limitations
Table 3-1 . Memory speed benchmark (8MHz clocked microcontroller
Note:
NAND Flash
DataFlash
MMC/SD
The limitations on reading operations are:
The limitations on writing operations are:
– Dataflash: SPI bus frequency, internal read access speed
– SD/MMC: SPI bus frequency, internal read access speed
– NAND Flash: USB maximum data rate
– Dataflash: internal write access speed, page write duration & size, SPI bus
– SD/MMC: internal write access speed and duration, SPI bus frequency
– NAND Flash: memory internal writing structure (COPYBACK support or not,
frequency
page write and block erase duration, page size), USB maximum data rate
1. The AVR micro controller cannot be clocked at 16MHz since this configuration
2. In the K9K2G08UOM device, the COPYBACK instruction cannot be used in all the
requires a 4.5V minimum power supply whereas NAND Flash or SD/MMC devices do
not withstand such a voltage level on I/Os. However, DataFlash are 5V-tolerant, and
speed measurements have been done independently of this evaluation board: for
45DB321, write speed is 40KB/sec and read speed is 300KB/sec. For 45DB642,
write speed is 80KB/sec and read speed is 300KB/sec.
memory plane, since it is efficient only between size-limited zones. This problem con-
cern several other memorie devices.
AT45DB321 (page 512B)
AT45DB642 (page 1024B)
SD 1GB 80x
SD 256MB
MMC Plus 2GB Premium
MMC 32MB (old revision)
M29F2G008AAC (page 2KB, copyback)
K9K2G08UOM (page 2KB, copyback disabled
HYF31DS512805 (page 512B, no copyback)
Memory
(2)
)
Software Implementation
Speed (KBytes/sec)
Read
1095
1005
1110
200
200
235
215
235
215
(1)
)
7740B–AVR–03/08
Write
235
155
170
860
660
590
35
55
50
3-17