參數(shù)資料
型號: MCIMX31VMN5C
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 532 MHz, MICROPROCESSOR, PBGA473
封裝: 19 X 19 MM, 0.80 MM PITCH, ROHS COMPLIANT, MAPBGA-473
文件頁數(shù): 73/122頁
文件大小: 1418K
代理商: MCIMX31VMN5C
MCIMX31/MCIMX31L Technical Data, Rev. 4.1
54
Freescale Semiconductor
Electrical Characteristics
Figure 39. Mobile DDR SDRAM DQ versus DQS and SDCLK Read Cycle Timing Diagram
NOTE
SDRAM CLK and DQS related parameters are being measured from the
50% point—that is, high is defined as 50% of signal value and low is defined
as 50% of signal value.
The timing parameters are similar to the ones used in SDRAM data
sheets—that is, Table 39 indicates SDRAM requirements. All output signals
are driven by the ESDCTL at the negative edge of SDCLK and the
parameters are measured at maximum memory frequency.
4.3.10
ETM Electrical Specifications
ETM is an ARM protocol. The timing specifications in this section are given as a guide for a TPA that
supports TRACECLK frequencies up to 133 MHz.
Figure 40 depicts the TRACECLK timings of ETM, and Table 40 lists the timing parameters.
Figure 40. ETM TRACECLK Timing Diagram
Table 39. Mobile DDR SDRAM Read Cycle Timing Parameters
ID
Parameter
Symbol
Min
Max
Unit
SD21 DQS – DQ Skew (defines the Data valid window in read cycles related to DQS).
tDQSQ
0.85
ns
SD22 DQS DQ HOLD time from DQS
tQH
2.3
ns
SD23 DQS output access time from SDCLK posedge
tDQSCK
6.7
ns
SDCLK
DQS (input)
DQ (input)
Data
SD23
SD21
SD22
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:
i.MX31
Product
Family
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