User manual

12 GR-UT699 Development Board

User Manual

2.3.1 SRAM

The GR-UT699 board is laid out with two SRAM memory banks but only has one bank

mounted as standard. Each bank is made up of five CY7C1069AV33. These devices are

16Mbit (2Mbyte x 8 bit devices with 10 or 12 ns access times.

The five devices provide (32 + 8) bit wide SRAM memory paths allowing EDAC operation.

These memory banks are mapped as RAMBANK0 and RAMBANK1.

In case the user wishes to disable the on board memory, this can be done by removing the

jumpers JP5 on the PCB.

2.3.2 FLASH

The GR-UT699 board has mounted as standard one FLASH memory bank, made up of two

Intel JS28F640J3 FLASH devices. These devices are 64Mbit (8Mbyte x 16 bit devices),

typically with 90ns access times. The data bus width to the Flash memory is 32 bits wide.

Note that, the PROM width and PROM EDAC conditions are set by the state of the

GPIO[2..0] pins at power up of the Processor. Therefore the GPIO[2..0] DIP switches on the

PCB must be appropriately set for the correct operation of the PROM memory at start up of

the processor. For information on the GPIO[2..0] settings refer to the Memory Configuration

documentation in the Leon3 User Manual, or RD-3.

2.3.3 EEPROM

The GR-UT699 board additionally has a DIP32 socket suitable for mounting an EEPROM

device. The data bus width to the EEPROM device is 8 bits wide.

This socket is suitable for mounting an EEPROM device of the type AT28LV010, or

compatible, in DIP32 package. The AT28LV010 is an ATMEL EEPROM, of 1Mbit capacity

organised as 128kByte x 8 bits.

Jumpers are provided to enable the user to select either the FLASH PROM device or the

EEPROM to operate as the ROMBANK0 device which appears at the initial memory location

of 0x00000000.

2.3.4 MEMORY EXPANSION CONNECTOR

Access to the memory signals is provided by the connectors J9 and J11. This enables uses

to conceive their own mezzanine boards and functions. Please see section.2.12.5

2.4 CAN Interface

The board provides the electrical interfaces for two CAN bus interfaces, as represented in

the block diagram, Figure 2-4.

The CAN bus transceiver IC's on this board are SN65HVD230 devices from Texas

Instruments which operate from a single +3.3V power supply.

The connector interfaces are male DSUB-9 connectors adhering to the standard pin-out for

this type of interface (ref. Table 4-6 And Table 4-5).