252479-007US Datasheet, PDF (46/128 Pages) Intel Corporation – Intel IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor

Functional Signal Descriptions
Table 19.
Table 20.
System Interface^††
Name
Power
Reset
or Sys
Reset
Post
Reset
Type^†
Description
HIGHZ_N
Used for test purposes only.
H
VI/PE
I
Must be pulled high for normal operation.
PLL_LOCK
0
VO
O Signal used to inform external reset logic that the internal PLL has achieved a locked state.
RCOMP
Tied off Tied off
Signal used to control PCI drive strength characteristics. Drive strength is varied on PCI address, data and
to a
to a
O ^{control signals.}
resistor resistor
Pin requires a 34-Ω +/- 1% tolerance resistor to ground. Refer to Figure 13 on page 80.
†
For a legend of the Type codes, see Table 5 on page 30.
††
IMPORTANT NOTE: When a system-level reset is asserted to the Intel^® IXP42X Product Line of Network Processors and IXC1100 Control Plane
Processor — either via a power-on reset, a system reset, or a Watchdog-Timer reset — and any interface is in an active transaction (particularly the PCI
bus or expansion bus, but not precluding any interface), an illegal protocol is generated. The behavior of the IXP42X product line and IXC1100 control
plane processors is undefined in this situation and a reset of other attached devices may be required.
Power Interface
Name
Type^†
Description
VCC
I 1.3-V power supply input pins used for the internal logic.
VCCP
I 3.3-V power supply input pins used for the peripheral (I/O) logic.
VSS
Ground power supply input pins used for both the 3.3-V and the 1.3-V power supplies.
VCCOSCP
3.3-V power supply input pins used for the peripheral (I/O) logic of the analog oscillator circuitry.
I
Require special power filtering circuitry. Refer to Figure 11 on page 79
VSSOSCP
Ground input pins used for the peripheral (I/O) logic of the analog oscillator circuitry. Used in conjunction with the VCCOSCP pins.
I
Requires special power filtering circuitry. Refer to Figure 11 on page 79
VCCOSC
1.3-V power supply input pins used for the internal logic of the analog oscillator circuitry.
I
Requires special power filtering circuitry. Refer to Figure 12 on page 80
VSSOSC
Ground power supply input pins used for the internal logic of the analog oscillator circuitry. Used in conjunction with the VCCOSC pins.
I
Requires special power filtering circuitry. Refer to Figure 12 on page 80
VCCPLL1
1.3-V power supply input pins used for the internal logic of the analog phase lock-loop circuitry.
I
Requires special power filtering circuitry. Refer to Figure 9 on page 78
VCCPLL2
1.3-V power supply input pins used for the internal logic of the analog phase lock-loop circuitry.
I
Requires special power filtering circuitry. Refer to Figure 10 on page 79
†
For a legend of the Type codes, see Table 5 on page 30.
June 2007
46
Intel^® IXP45X and Intel^® IXP46X Product Line of Network Processors Datasheet
Document Number: 252479-007US