User manual

13 GR-LEON4-ITX Development Board
User Manual
2.4 PCI Slots
The LEON4 ASIC device incorporates a GRPCI Fast 32-bit PCI bridge core which functions
as the PCI Host Controller on the LEON4-ITX Board.
To allow this board to function as a PCI motherboard, this board includes two 32 bits, 33MHz
PCI motherboard slot connectors, PCI-J1 and PCI-J2.
Note that the PCI slots are intended for cards which are compatible with 3.3V PCI signalling
voltage levels.
2.5 Ethernet Interface
The LEON4 ASIC device incorporates two Ethernet controllers with support for RMII
interface, and the GR-LEON4-ITX Development Board has two National Semiconductor
DP83848 10/100Mbit/s Ethernet PHY transceivers. These are connected to a dual RJ45
connector are on board.
For more information on the registers and functionality of the Ethernet MAC+PHY device
please refer to the data sheet for the DP83848 device.
The RMII Ethernet PHY's are provided with a 50 MHz clock derived from the oscillator X1 on
the board.
2.6 USB Host
The LEON4 ASIC device includes two USB 2.0 Host interfaces, and these are connected to
two on-board ISP1504 USB PHY devices using a standardised 8 bit ULPI interface,
operating at 60MHz.The ULPI interface configuration for the host interfaces is represented in
Figure 2-6.
© Aeroflex Gaisler AB August 2010, Rev. 0.3
Figure 2-5: Block diagram of Ethernet RMII Interface
(one of 2 interfaces shown)
ASIC
ASIC
ETH_RMIICLK
50MHz
50MHz
ETHERNET
RMII PHY
ETHERNET
RMII PHY
RJ45
RJ45
ETH_RXD[1..0]2
ETH_TXD[1..0]2
ETH_TXEN
ETH_CRS_DV
ETH_MDIO
ETH_MDC
ETH_MDINT
RESETN