Intel EP80579 Manual page 295

Table 100. Schematic Checklist (Sheet 12 of 26)
Checklist Items
SIU_DTR[2:1]#
SIU_RI[2:1]#
SIU_RTS[2:1]#
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Intel EP80579 Integrated Processor Product Line
Platform Design Guide
295
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Intel EP80579 Integrated Processor Product Line—Schematics Checklist
I/O Type
Recommendations
(Default)
• Connect signals appropriately
to RS-232 Transceiver
Strapping Options:
SIU_DTR[1]# -
I/O
(SIW Config Port Address
Select)
• 0 = SIW IO Addresses are 20Eh
and 20Fh
• 1 = SIW IO Addresses are 04Eh
and 04Fh (default)
• Connect signals appropriately
I/O
to RS-232 Transceiver
• Connect signals appropriately
I/O
to RS-232 Transceiver
Comments
• UART Port[2:1] Data Terminal
Ready: When low, these pins inform
the modem or data set that the
UART ports are ready to establish a
communication link.
Note:
• SIU_DRT[1]# is sampled on Power-
up to select SIW Configuration Port
Address. This strap selects the IO
Address for the Serial I/O Unit and
Watchdog Time
• Signals have 50KΩ internal pull-ups
Note:
• SIU_DTR[1] need to be strapped
appropriately even if the port is not
used or not connected to an
interfacing device.
• SIU_DTR[2] can be left as no
connect (NC) if the port is not used.
• Do not strap or drive SIU_DTR[2]
signal low during power-up until the
CPURST# signal is de-asserted.
• UART Port[2:1] Ring Indicator:
Active low, these pins indicate that
a telephone ringing signal has been
received by the external agents for
UART port [2:1].
Note:
• Must be pulled high through a 10
KΩ resistor when the port is not
connected to an interfacing device
• UART Port[2:1] Request To Send:
When low these pins inform the
modem or data set that UART ports
want to send data on an established
communication link. The RTS#
output signal can be set to an active
low by programming the RTS (bit 1)
of the Modem Control Register to a
logic '1'. A Reset operation sets this
signal to its inactive state (logic '1').
LOOP mode operation holds this
signal in its inactive state
• Signals have 50KΩ internal pull-ups
Note:
• Signal can be left as NC when the
port is not connected to an
interfacing device
• Do not strap or drive SIU_RTS[1] or
SIU_RTS[2] signal low during
power-up until the CPURST# signal
is de-asserted.
Order Number: 320068-005US
May 2010