Page History
...
| Note |
|---|
SPI Flash QE (Quad Enable) bit must be set to high or FPGA is unable to load its configuration from flash during power-on. By default this bit is set to high at the manufacturing plant. |
RTC - Real Time Clock
MAC Address EEPROM
A Microchip 24AA025E48 EEPROM (U19) is used which contains a globally unique 48-bit node address, that is compatible with EUI-48TM specification. The device is organized as two blocks of 128 x 8-bit memory. One of the blocks stores the 48-bit node address and is write protected, the other block is available for application use. It is accessible through the I2C slave address 0x50.
RTC - Real Time Clock
An temperature compensated Intersil ISL12020M is used for Real Time Clock (U16). Battery voltage must be supplied to the module from the baseboard. Battery An temperature compensated Intersil ISL12020M is used for Real Time Clock (U16). Battery voltage must be supplied to the module from the baseboard. Battery backed registers can be accessed over I2C bus at slave address of 0x6F. General purpose RAM is at I2C slave address 0x57. RTC IC is supported by Linux so it can be used as hwclock device.
...
Table 12: Programmable clock generator I/Os.
MAC Address EEPROM
A Microchip 24AA025E48 EEPROM (U19) is used which contains a globally unique 48-bit node address, that is compatible with EUI-48TM specification. The device is organized as two blocks of 128 x 8-bit memory. One of the blocks stores the 48-bit node address and is write protected, the other block is available for application use. It is accessible through the I2C slave address 0x50.
Oscillators
The module has following reference clock signals provided by on-board oscillators:
| Source | Signal | Frequency | Destination | Pin Name | Notes |
|---|---|---|---|---|---|
| U18 | CLK | 25.000000 MHz | U10 | IN3 | |
| U9 | CLK | 25.000000 MHz | U7 | XTAL_IN | |
| U11 | PS-CLK | 33.333333 MHz | U5 | PS_CLK_500 | Zynq SoC PS subsystem main clock. |
| U15 | CLK | 52.000000 MHz | U6 | REFCLK | USB3320C PHY reference clock. |
Table 13: Reference clock signals.
...
Overview
Content Tools