Intel Celeron Processor in the 478-Pin Package at 1.80 GHz Datasheet
28 Datasheet
Intel
®
Celeron
®
Processor in the 478-Pin Package
2.12 System Bus AC Specifications
The processor system bus timings specified in this section are defined at the processor core
silicon and are thus not measurable at the processor pins. See Chapter 5.0 for the Celeron
processor in the 478-pin package pin signal definitions.
Table 14 through Table 18 list the AC specifications associated with the processor system bus.
All AGTL+ timings are referenced to GTLREF for both ‘0’ and ‘1’ logic levels unless otherwise
specified.
The timings specified in this section should be used in conjunction with the I/O buffer models
provided by Intel. These I/O buffer models, which include package information, are available for
the Celeron
processor in the 478-pin package in IBIS format. AGTL+ layout guidelines are also
available in the appropriate Platform Design Guide.
Care should be taken to read all notes associated with a particular timing parameter.
NOTES:
1. Unless otherwise noted, all specifications in this table apply to all processor core frequencies.
2. The period specified here is the average period. A given period may vary from this specification as governed
by the period stability specification (T2).
3. For the clock jitter specification, refer to the CK408 Clock Design Guidelines.
4. In this context, period stability is defined as the worst case timing difference between successive crossover
voltages. In other words, the largest absolute difference between adjacent clock periods must be less than
the period stability.
5. Slew rate is measured between the 35% and 65% points of the clock swing (V
L
to V
H
).
Table 13. System Bus Differential Clock Specifications
T# Parameter Min Nom Max Unit Figure Notes
1
System Bus Frequency 100 MHz
T1: BCLK[1:0] Period 10.0 10.2 ns 6 2
T2: BCLK[1:0] Period Stability 200 ps 6 3, 4
T3: BCLK[1:0] High Time 3.94 5 6.12 ns 6
T4: BCLK[1:0] Low Time 3.94 5 6.12 ns 6
T5: BCLK[1:0] Rise Time 175 700 ps 6 5
T6: BCLK[1:0] Fall Time 175 700 ps 6 5