Intel EP80579

Intel
®
EP80579 Integrated Processor Product Line—Schematics Checklist
Intel
®
EP80579 Integrated Processor Product Line
Platform Design Guide May 2010
305 Order Number: 320068-005US
EX_ADDR[24:0]
• Expansion Bus Address.
• Connect to Expansion Bus on-
board devices and inbound/
outbound buffer
• Strap EX_ADDR[23:21] as
shown below to determine LEB
Bus memory size.
Note:
• BIOS can also be used to
configure the LEB_SIZE
through the MMBAR (Expansion
Bus Base Address Register)
instead of external strapping.
(Refer to EP80579 Datasheet)
• The LEB controller allocates up to
256 MB of memory space to support
up to 8 devices on the LEB Bus. At
power-up or whenever RESET_IN#
is asserted, EX_ADDR[23:21] bits
are captured and stored by the LEB
controller to detemine the LEB
memory size (LEB_SIZE) and the
number of devices on the bus,
which also controls the active LEB
chip selects. The EX_ADDR[23:21]
should be externally strapped with
1KΩ pull-ups and pull-downs to
determine the LEB_SIZE.
Note:
• Can be left as no connect (NC)
when the LEB Bus is not connected
to an interfacing device or not used
LEB_SIZE Strapping Options:
EX_BE[1:0] I/O
• Expansion Bus Byte Enables.
• Used to select the particular
bytes that will be written or
read when executing inbound/
outbound HSS transfers.
Note:
• Can be left as no connect (NC)
when the interface is not connected
to an interfacing device or not used
EX_CLK I
• 33 MHz Expansion Clock
• Use an External 33 MHz Clock
with a clock buffer
• Connected to one of the
outputs from the Expansion
Clock Fanout Buffer.
• Connect clock
through a 33 Ω
±5% series resistor.
The EP80579 Expansion Bus connects to
several devices on the Platform.
•Flash (2)
•FPGA
•HSS [3:0]
Each device should be connected to one
of the outputs from the clock fanout
buffer.
Note:
• Connect EX_CLK to a 33 MHz clock
source when the interface is not
used or connected to other devices.
•See Section 2.3
Table 100. Schematic Checklist (Sheet 22 of 26)
Checklist Items
I/O Type
(Default)
Recommendations Comments
EX_ADDR
[23:21]
Strapping
LEB Memory Size
(LEB_SIZE)
# of
Devices
Supported
000 0 MB 0
001 32 MB 1
010 64 MB 2
011 128 MB 4
1XX 256 MB 8
Note: Strap EX_ADDR[23:21] = 000 or use
BIOS to configure LEB_SIZE = 0 MB if
the LEB Bus is not used.