參數(shù)資料
型號(hào)： MSC8122
廠商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
元件分類(lèi)： 數(shù)字信號(hào)處理
英文描述： Quad Core 16-Bit Digital Signal Processor
中文描述： 四核16位數(shù)字信號(hào)處理器
文件頁(yè)數(shù)： 41/88頁(yè)
文件大?。?/td> 983K
代理商： MSC8122
AC Timings
MSC8122 Technical Data, Rev. 13
Freescale Semiconductor
2-7
2.5.4
The MSC8122 has several inputs to the reset logic:
Reset Timing
Power-on reset (
PORESET
)
External hard reset (
HRESET
)
External soft reset (
SRESET
)
Software watchdog reset
Bus monitor reset
Host reset command through JTAG
All MSC8122 reset sources are fed into the reset controller, which takes different actions depending on the source
of the reset. The reset status register indicates the most recent sources to cause a reset.
Table 2-9
describes the reset
sources.
Table 2-10
summarizes the reset actions that occur as a result of the different reset sources.
PLL output frequency (VCO output)
300 MHz core
400 MHz core
500 MHz core
CLKOUT frequency jitter
1
CLKOUT phase jitter
1
with CLKIN phase jitter of ±100 ps.
Notes:
1.
Peak-to-peak.
2.
Not tested. Guaranteed by design.
800
1200
1600
2000
200
500
MHz
MHz
MHz
MHz
ps
ps
—
—
Table 2-9.
Reset Sources
Name
Direction
Description
Power-on reset
(PORESET)
Input
Initiates the power-on reset flow that resets the MSC8122 and configures various attributes of the
MSC8122. On PORESET, the entire MSC8122 device is reset. SPLL states is reset, HRESET and
SRESET are driven, the SC140 extended cores are reset, and system configuration is sampled. The
clock mode (MODCK bits), reset configuration mode, boot mode, Chip ID, and use of either a DSI 64
bits port or a System Bus 64 bits port are configured only when PORESET is asserted.
External hard
reset (HRESET)
Input/ Output
Initiates the hard reset flow that configures various attributes of the MSC8122. While HRESET is
asserted, SRESET is also asserted. HRESET is an open-drain pin. Upon hard reset, HRESET and
SRESET are driven, the SC140 extended cores are reset, and system configuration is sampled. The
most configurable features are reconfigured. These features are defined in the 32-bit hard reset
configuration word described in
Hard Reset Configuration Word
section of the
Reset
chapter in the
MSC8122 Reference Manual
.
External soft reset
(SRESET)
Input/ Output
Initiates the soft reset flow. The MSC8122 detects an external assertion of SRESET only if it occurs
while the MSC8122 is not asserting reset. SRESET is an open-drain pin. Upon soft reset, SRESET is
driven, the SC140 extended cores are reset, and system configuration is maintained.
Software
watchdog reset
Internal
When the MSC8122 watchdog count reaches zero, a software watchdog reset is signalled. The
enabled software watchdog event then generates an internal hard reset sequence.
Bus monitor reset
Internal
When the MSC8122 bus monitor count reaches zero, a bus monitor hard reset is asserted. The
enabled bus monitor event then generates an internal hard reset sequence.
Host reset
command through
the TAP
Internal
When a host reset command is written through the Test Access Port (TAP), the TAP logic asserts the
soft reset signal and an internal soft reset sequence is generated.
Table 2-8.
System Clock Parameters
Characteristic
Min
Max
Unit
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