LEA-6 / NEO-6 - Hardware Integration Manual
GPS.G6-HW-09007-A
Preliminary
Hardware description
Page 14 of 62
Ensure that at the start up the host allows enough time for the receiver to communicate over the bus to
establish presence of the EEPROM. It is only when this interrogation is complete that the host can exercise
full control over the bus (MASTER mode).
Also note that the FLASH based modules do not attempt to store any information in the external EEPROM
and as such do not attempt to communicate to the external EEPROM. The ROM based receivers always
interrogate external EEPROM at the start-up. The interrogation process is guaranteed to complete within
250ms upon start up. This is the time the external host has to give to the ROM based GPS receiver to
complete the EEPROM interrogation.
Although the FLASH based modules do not attempt to detect the EEPROM at the start up, an attempt to
communicate to the GPS receiver via DDC before 250msec expires is not advised because the GPS receiver
is unable to respond due to other start up activities.
The u-blox 6 DDC interface provides serial communication with u-blox LEON-G100/G200 wireless
modules from version LEON-G100/G200-05S and above.
With u-blox 6, when reading the DDC internal register at address 0xFF (messages transmit buffer), the
master must not set the reading address before every byte accessed as this could cause a faulty behavior.
Since after every byte being read from register 0xFF the internal address counter is incremented by one
saturating at 0xFF, subsequent reads can be performed continuously.
1.6.4
SPI (NEO-6)
A Serial Peripheral Interface (SPI) is available with selected u-blox 6 modules. The SPI allows for the connection of
external devices with a serial interface, e.g. FLASH memories or A/D converters, or to interface to a host CPU.
Background information about the SPI interface is available in Appendix C.2.
1.6.4.1
Connecting SPI FLASH memory
SPI FLASH memory can be connected to the SPI interface to save Assist Now Offline data and/or receiver
configuration. It will automatically be recognized by firmware when connected to SS_N.
Figure 7 shows how external memory can be connected. Minimum SPI FLASH memory size is 1 Mbit.
u-blox GPS Re ce iv e r
SPI M aste r
SS_N
MISO
SCS_N
MI
VDD
MO
MOSI
SCK
SCK
VDD
Figure 7: Connecting external SPI Memory to u-blox GPS receivers
Following SPI serial Flash are supported
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