GCIXP1250BA 837411 Intel, GCIXP1250BA 837411 Datasheet - Page 73

• Manufacturer Part Number: GCIXP1250BA 837411
• Manufacturer: Intel

Specifications of GCIXP1250BA 837411

• Lead Free Status / Rohs Status: Supplier Unconfirmed

4.3
4.3.1
4.3.2
Datasheet
Figure 13. PXTAL Clock Input
Table 38. PXTAL Clock Inputs
AC Specifications
Clock Timing Specifications
The ac specifications consist of input requirements and output responses. The input requirements
consist of setup and hold times, pulse widths, and high and low times. Output responses are delays
from clock to signal. The ac specifications are defined separately for each clock domain within the
IXP1250.
For example,
39
further illustration of signal timing. Unless otherwise noted, all ac parameters are guaranteed when
tested within the functional operating range of
Unless otherwise indicated, all ac output delays are measured with a 5 pF load. Capacitive
deratings are provided for all output buffers.
PXTAL Clock Input
1. Not tested. Guaranteed by design.
2. Core frequency (F
3. Core frequency (F
4. Core frequency (F
F
V
V
V
F
pxtal
core
ptp
high
low
Network Processor Family Micrcode Programmer’s Reference Manual for a complete list of programmable frequencies.
Network Processor Family Micrcode Programmer’s Reference Manual for a complete list of programmable frequencies..
and
Table 40
Symbol
Figure 14
specify parameter values for clock signal ac timing. See also
core
core
core
V
ptp
) of 199.0656 MHz when register PLL_CFG[4:0] = 10011b and F
) of 165.89 MHz when register PLL_CFG[4:0] = 10000b.
) of 166.67 MHz when register PLL_CFG[4:0] = 01111b and F
shows the ac parameter measurements for the PCI_CLK signal, and
Clock frequency
Clock peak to peak
Clock high threshold
Clock low threshold
Clock slew rate
Core frequency
V
l
V
h
Parameter
T
r
1
T
2,3,4
high
1/F
Table
PXTAL
T
3.5795
0.6*VDDX
2.0
---
1
f
Minimum
32.
T
low
Intel
3.6864
165.89
®
Typical
IXP1250 Network Processor
pxtal
pxtal
= 3.7878 MHz. Refer to the IXP1200
= 3.6864 MHz. Refer to the IXP1200
3.7878
---
---
0.8
4
Maximum
Figure 15
MHz
V
V
V
V/ns
MHz
for a
A8553-01
Unit
Table
73