參數(shù)資料
型號: MSC8126TMP6400
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 數(shù)字信號處理
英文描述: 0-BIT, 400 MHz, OTHER DSP, PBGA431
封裝: 20 X 20 MM, PLASTIC, FCBGA-431
文件頁數(shù): 15/48頁
文件大小: 1138K
代理商: MSC8126TMP6400
MSC8126 Quad Digital Signal Processor Data Sheet, Rev. 15
Electrical Characteristics
Freescale Semiconductor
22
2.5.5
System Bus Access Timing
2.5.5.1
Core Data Transfers
Generally, all MSC8126 bus and system output signals are driven from the rising edge of the reference clock (REFCLK). The
REFCLK is the CLKIN signal. Memory controller signals, however, trigger on four points within a REFCLK cycle. Each cycle
is divided by four internal ticks: T1, T2, T3, and T4. T1 always occurs at the rising edge of REFCLK (and T3 at the falling
edge), but the spacing of T2 and T4 depends on the PLL clock ratio selected, as Table 13 shows.
Figure 10 is a graphical representation of Table 13.
Table 13. Tick Spacing for Memory Controller Signals
BCLK/SC140 clock
Tick Spacing (T1 Occurs at the Rising Edge of REFCLK)
T2
T3
T4
1:4, 1:6, 1:8, 1:10
1/4 REFCLK
1/2 REFCLK
3/4 REFCLK
1:3
1/6 REFCLK
1/2 REFCLK
4/6 REFCLK
1:5
2/10 REFCLK
1/2 REFCLK
7/10 REFCLK
Figure 10. Internal Tick Spacing for Memory Controller Signals
REFCLK
T1
T2
T3
T4
REFCLK
T1
T2
T3
T4
for 1:3
for 1:5
REFCLK
T1
T2
T3
T4
for 1:4, 1:6, 1:8, 1:10
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