
Package Information
May 2005
Intel IXP45X and Intel IXP46X Product Line of Network Processors Datasheet
78
Document Number: 306261-002
EX_PARITY[3:0]
H
VB
I/O
Byte wide parity protection on the EX_DATA[31:0]
EX_REQ_N[3:1]
Z
H
VI/H*
I
Signals used by external masters to gain access to the bus. An external master asserts this signal to
the internal arbiter to request access to use the expansion bus signals.
* When configured in external arbiter mode of operation, an internal pull-up will be enabled, thus the
pins will be driven to VCC
Should be pulled high through a 10-K
resistor when not being utilized in the system.
EX_REQ_GNT_N
Z
VI
I
When the IXP45X/IXP46X network processors are functioning as the Expansion bus arbiter, this
signal will serve as the request input from an external master. If there is an external arbiter used for
expansion bus accesses, this signal will serve as the expansion bus grant input from the external
arbiter.
Should be pulled high through a 10-K
resistor when not being utilized in the system.
EX_GNT_N[3:1]
Z
b’111
VO
O
Signals used by the arbiter to inform external masters that the master is now granted access to use
the bus. In response to an EX_REQ_N being asserted by an external master, the arbiter will output
the corresponding EX_GNT_N signal to inform the external master that the expansion bus is clear
for that master to utilize.
EX_GNT_REQ_N
Z
1
VO
O
When the IXP45X/IXP46X network processors are functioning as the Expansion bus arbiter, this
signal will serve as the grant output for an external master asserting the corresponding request. If
there is an external arbiter used for expansion bus accesses, this signal will serve as the expansion
bus request output signal to the external arbiter.
EX_SLAVE_CS_N
Z
VI
I
The expansion bus chip select input is used to determine when an external master is attempting to
access the IXP45X/IXP46X network processors’ expansion bus interface and internal memory map
of the processors.
Should be pulled high through a 10-K
resistor when not being utilized in the system.
Table 17.
Expansion Bus Interface (Sheet 3 of 4)
Name
Power
on
Reset
Normal
After
Reset
Until
Software
Enables
Normal
After
Software
Enables
Type
Description
NOTE:
This table discusses all features supported on the Intel IXP45X and Intel IXP46X Product Line of Network Processors. For details on feature support listed by
processor, see Table 1 on page 14.
For a legend of the Type codes, see Table 10 on page 46.