Intel EP80579 Manual page 306

Schematics Checklist—Intel
Table 100. Schematic Checklist (Sheet 23 of 26)
Checklist Items
EX_CS[7:0]#
EX_DATA[15:0],
EX_WR#
EX_RD#
EX_IOWAIT#
EX_PARITY[1:0]
®
Intel EP80579 Integrated Processor Product Line
Order Number: 320068-005US
®
EP80579 Integrated Processor Product Line
I/O Type
Recommendations
(Default)
• External Chip Selects for the
Expansion Bus Peripheral
Devices
I/O
• Pull-up to Platform 3.3V (VCC3)
supply through a 10 KΩ ±5%
resistor
• Bi-directional Expansion Bus
data/ Expansion Write
Command/ Expansion Bus Read
Command.
• Isolate DATA/ WR#/RD# to
I/O Platform on-board devices from
inbound/outbound devices
using an external data buffer.
• Buses to all on-board devices
are isolated from each other
using 22 Ω ±5% series resistors.
• Data ready/acknowledge from
expansion bus devices
I
• Pull-up to Platform 3.3V (VCC3)
supply through a 10 KΩ ±5%
resistor
• Byte wide parity protection on
I/O
inbound/outbound transfers.
Comments
Expansion Bus Target Chip Selects: Chip
selects to select Expansion Bus devices.
• Devices using EX_CS[3:0]# indicate
Data Ready with EX_IOWAIT#
during EP80579 Read accesses
• Devices using EX_CS[7:4]# indicate
Data Ready with EX_RDY[3:0]#
during EP80579 Read accesses
Note:
• Must be pulled high through a 10
KΩ resistor when the interface is not
used or connected to an interfacing
device.
• See Section 22.3.4 for more details.
Note: EP80579 requires a 2nSec hold
time during read accesses.
Requires to delay EX_RD#
signal by 2ns(min) if the
interfacing device cannot meet
the Thold=2nSec time required
by EP80579.
Note:
• Can be left as no connect (NC)
when the interface is not connected
to an interfacing device or not used
• An expansion bus access is halted
when an external device asserts
EX_IOWAIT# and resumes access
from the halted location once the
external device de-asserts
EX_IOWAIT#
• Expansion Bus Devices using
EX_CS[3:0]# indicate Data Ready
with EX_IOWAIT# during EP80579
Read Accesses.
Note:
• Must be pulled high through a 10
KΩ resistor when the interface is not
used or connected to an interfacing
device
Note:
• Can be left as no connect (NC)
when the interface is not connected
to an interfacing device or not used
May 2010
306