T1022NXE7MQA
| Model | T1022NXE7MQA |
| Description | 32-BIT, 1200MHz, RISC PROCESSOR, PBGA780 |
| PDF file | Total 197 pages (File size: 1M) |
| Chip Manufacturer | PHILIPS |
Electrical characteristics
3.6.2 Spread-spectrum sources
Spread-spectrum clock sources are an increasingly popular way to control
electromagnetic interference emissions (EMI) by spreading the emitted noise to a wider
spectrum and reducing the peak noise magnitude in order to meet industry and
government requirements. These clock sources intentionally add long-term jitter to
diffuse the EMI spectral content. The jitter specification given in
considers
short-term (cycle-to-cycle) jitter only. The clock generator's cycle-to-cycle output jitter
should meet the chip's input cycle-to-cycle jitter requirement. Frequency modulation and
spread are separate concerns; the chip is compatible with spread-spectrum sources if the
recommendations listed in
are observed.
Table 15. Spread-spectrum clock source recommendations
3
Parameter
Frequency modulation
Frequency spread
Notes:
1. SYSCLK frequencies that result from frequency spreading and the resulting core frequency must meet the minimum and
maximum specifications given in
2. Maximum spread-spectrum frequency may not result in exceeding any maximum operating frequency of the device.
3. At recommended operating conditions with O1VDD = 1.8 V, see
-
-
Min
60
1.0
Max
kHz
%
Unit
-
1, 2
Notes
CAUTION
The processor's minimum and maximum SYSCLK and core/
platform/DDR frequencies must not be exceeded regardless of
the type of clock source. Therefore, systems in which the
processor is operated at its maximum rated core/platform/DDR
frequency should avoid violating the stated limits by using
down-spreading only.
3.6.3 Real-time clock timing
The real-time clock timing (RTC) input is sampled by the platform clock. The output of
the sampling latch is then used as an input to the counters of the MPIC and the time base
unit of the core; there is no need for jitter specification. The minimum period of the RTC
signal should be greater than or equal to 16x the period of the platform clock with a 50%
duty cycle. There is no minimum RTC frequency; RTC may be grounded if not needed.
QorIQ T1042, T1022 Data Sheet, Rev. 2, 06/2015
Freescale Semiconductor, Inc.
63
