Cypress DCT-1D Podręcznik Użytkownika Pobierz pdf (Strona 16)

CHAPTER 1. THE SYST EM

The Ethernet IP Core is capable of operating at 10 or 100 Mbps for Ethernet and

Fast Ethernet applications. An external PHY is needed for a complete Ethernet solu-

tion.

In short the ethernet controller works as follows. There are 64 transmit buffers

and 64 receive buffers. These buffers are typically located in the SRAM. To each such

buffer there is a pair of registers (a buffer descriptor) inside the Ethernet Controller, one

ethernet controller transmits/receives packets from/to the SRAM buffers with DMA.

1.3.7 VGA Controller

The VGA controller used is designed by us and is a simple single-video-mode con-

troller for use in FPGA or ASIC environments. The VGA controller supports a single

resolution/refresh rate in grey scale or 8-bit pseudocolor with 15-bit color sprites. For

further details see [12].

1.3.8 UART

The UART (Universal Asynchronous Receiver Transmitter) is an implementation of

the industry standard 16550 device. Details can be found in [13].

1.4 Software

1.4.1 Memory map

Address Type Content

0x0000_0000 - 0x03ff_ffff SDRAM Programs can be loaded and run here 64 MB

0x2000_0000 - 0x200f_ffff SRAM Data area 1MB

0x4000_0000 - 0x4000_5fff ROM Boot monitor, 24kB

0x4001_1000 - 0x4001_1fff RAM Data area for the monitor and stack 8kB

0x9000_0000 - 0x90ff_ffff UART

0x9100_0000 - 0x91ff_ffff Parallel port

0x9200_0000 - 0x92ff_ffff E thernet

0x9600_0000 - 0x96ff_ffff Accelerator Your JPEG accelerator

0xf000_0000 - 0xf0ff_ffff FLASH Bender, µClinux and Linux

1.4.2 A simple boot monitor

A simple monitor runs in the memory on slave port 1. The monitor will start at boot.

Use for instance gtkterm and adjust the baud rate to 115200 b/s. Format should be

8N1 and no ﬂow control. The port shall be /dev/ttyUSB0. Type h for help. Some

available commands are explained in table 1.2.

Type l and then use the command File -> Send raw file in gtkterm to load

an Intel hex ﬁle into memory. The hex ﬁle its elf contains addres s information.

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 81 82

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