gwixp465bad ETC-unknow, gwixp465bad Datasheet - Page 68

• Manufacturer Part Number: gwixp465bad
• Description: Network Proc 1.3v/1.4v/2.5v/3.3v 400mhz 544-pin Bga
• Manufacturer: ETC-unknow

Package Information
Table 16.
August 2006
68
EX_REQ_N[3:1]
EX_REQ_GNT_N
EX_GNT_N[3:1]
EX_GNT_REQ_N
EX_SLAVE_CS_N
EX_BURST
EX_WAIT_N
Note:
†
Name
This table discusses all features supported on the Intel
see
For a legend of the Type codes, see
Table 1 on page
Expansion Bus Interface (Sheet 3 of 3)
Reset
Power
on
H
Z
Z
Z
Z
Z
Z
†
13.
Reset
b’111
VI
VI
VI
H
1
H
†
Software
Enables
Normal
Table 8 on page
Reset
VI/H*
After
Until
VO
VO
VI
VI
VI
H
Software
Configur
Possible
Enables
ations
VI/H*
After
VO/H
VO
VO
VI
VI
VI
43.
®
IXP45X and Intel
Type
O
O
O
I
I
I
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-KΩ resistor when not being utilized in the system.
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-KΩ resistor when not being utilized in the system.
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.
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.
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-KΩ resistor when not being utilized in the system.
For inbound transfers, this signal is used to signify that a burst operation is being requested to
occur.
Should be pulled high through a 10-KΩ resistor when not being utilized in the system.
Expansion bus IXP45X/IXP46X network processors wait. EX_WAIT_N is driven by the processors
when EX_SLAVE_CS_N is asserted. After the de-assertion of EX_SLAVE_CS_N, the IXP45X/IXP46X
network processors will stop driving this signal. A pull-up in the PAD IO is enabled all the time to
prevent this bus from floating or transitioning to VSS. This signal is used to hold off an external
master when the expansion interface cannot be accessed immediately. Most commonly seen when a
read access of the interface is occurring and the data has not been returned from the internal
peripheral unit to the expansion interface.
®
IXP46X Product Line of Network Processors. For details on feature support listed by processor,
Intel
®
IXP45X and Intel
Description
®
IXP46X Product Line of Network Processors Datasheet
Document Number:
306261-004US