PICASO Datasheet, PDF (9/24 Pages) List of Unclassifed Manufacturers – Embedded Graphics Processor

4D SYSTEMS
Item
Sym Min Typ Max Unit
Read Low Pulse
tRL 150 - - ns
Read High Pulse
tRH 150 - - ns
Read Bus Cycle Total tRT 300 - - ns
Read Data Hold
tDH 75 - - ns
5.2. SPI Interface – Memory Card
The PICASO supports SD, micro-SD and MMC
memory cards via its hardware SPI interface. The
memory card is used for all multimedia file
retrieval such as images, animations and movie
clips and the SPI interface is dedicated for this
purpose only. The memory card can also be used
as general purpose storage for data logging
applications (RAW and FAT16 format support).
Support is available for micro-SD with up to 2GB
capacity and for high capacity HC memory cards
starting from 4GB and above.
PICASO Processor
SDCS pin (SD Memory Card Chip Select):
SD Memory-Card Chip Select (SDCS). SD memory
card use only. Connect this pin to the Chip Enable
(CS) signal of the memory card.
5.3. Serial Ports - COM0, COM1 UARTS
The PICASO Processor has two dedicated
hardware Asynchronous Serial ports that can
communicate with external serial devices. These
are referred to as the COM0 and the COM1 serial
ports.
The primary features are:
• Full-Duplex 8 bit data transmission and
reception.
• Data format: 8 bits, No Parity, 1 Stop bit.
• Independent Baud rates from 300 baud
up to 256K baud.
• Single byte transmits and receives or a
fully buffered service. The buffered
service feature runs in the background
capturing and buffering serial data
without the user application having to
constantly poll any of the serial ports. This
frees up the application to service other
tasks.
SDI pin (SPI Serial Data In):
The SPI Serial Data Input (SDI). SD memory card
use only. Connect this pin to the SPI Serial Data
Out (SDO) signal of the memory card.
SDO pin (SPI Serial Data Out):
The SPI Serial Data Output (SDI). SD memory card
use only. Connect this pin to the SPI Serial Data In
(SDI) signal of the memory card.
SCK pin (SPI Serial Clock):
The SPI Serial Clock output (SCK). SD memory card
use only. Connect this pin to the SPI Serial Clock
(SCK) signal of the memory card.
A single byte serial transmission consists of the
start bit, 8-bits of data followed by the stop bit.
The start bit is always 0, while a stop bit is always
1. The LSB (Least Significant Bit, Bit 0) is sent out
first following the start bit. Figure below shows a
single byte transmission timing diagram.
COM0 is also the primary interface for 4DGL user
program downloads and chip configuration PmmC
programming. Once the compiled 4DGL
application program (EVE byte-code) is
downloaded and the user code starts executing,
the serial port is then available to the user
application. Refer to Section 7. In-Circuit-Serial-
© 2012 4D SYSTEMS
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