參數(shù)資料
型號(hào)： MSC8101VT1500F
廠商： FREESCALE SEMICONDUCTOR INC
元件分類(lèi)： 數(shù)字信號(hào)處理
英文描述： 64-BIT, 75 MHz, OTHER DSP, PBGA332
封裝： 17 X 17 MM, LIDDED FLIP CHIP, PLASTIC, BGA-332
文件頁(yè)數(shù)： 54/104頁(yè)
文件大?。?/td> 1811K
代理商： MSC8101VT1500F
AC Timings
MSC8101 Technical Data, Rev. 18
Freescale Semiconductor
2-13
2.6.5
System Bus Access Timing
2.6.5.1 Core Data Transfers
Generally, all MSC8101 bus and system output signals are driven from the rising edge of the reference clock
(REFCLK), which is DLLIN. Memory controller signals, however, trigger on four points within a DLLIN cycle.
Each cycle is divided by four internal ticks: T1, T2, T3, and T4. T1 always occurs at the rising edge of DLLIN (and
T3 at the falling edge), but the spacing of T2 and T4 depends on the PLL clock ratio selected, as Table 2-15 shows.
Figure 2-9 is a graphical representation of Table 2-15.
Note:
The UPM machine and GPCM machine outputs change on the internal tick determined by the memory
controller programming; the AC specifications are relative to the internal tick. SDRAM machine outputs
change only on the DLLIN rising edge.
Table 2-15.
Tick Spacing for Memory Controller Signals
PLL Clock Ratio
Tick Spacing (T1 Occurs at the Rising Edge of DLLIN)
T2
T3
T4
1:2, 1:3, 1:4, 1:5, 1:6
1/4 DLLIN
1/2 DLLIN
3/4 DLLIN
1:2.5
3/10 DLLIN
1/2 DLLIN
8/10 DLLIN
1:3.5
4/14 DLLIN
1/2 DLLIN
11/14 DLLIN
Figure 2-9.
Internal Tick Spacing for Memory Controller Signals
Table 2-16.
AC Timing for SIU Inputs
No.
Characteristic
Value2
Units
10
Hold time for all signals after the 50% level of the DLLIN rising edge
0.5
ns
11a
ABB/AACK set-up time before the 50% level of the DLLIN rising edge
3.5
ns
11b
DBG/DBB/BR/TC set-up time before the 50% level of the DLLIN rising edge
5.0
ns
11c
ARTRY set-up time before the 50% level of the DLLIN rising edge
4.0
ns
11d
TA set-up time before the 50% level of the DLLIN rising edge
Pipeline mode
Non-pipeline mode
3.5
4.0
ns
11e
TEA set-up time before the 50% level of the DLLIN rising edge
Pipeline mode
Non-pipeline mode
4.0
3.0
ns
11f
PSDVAL set-up time before the 50% level of the DLLIN rising edge
Pipeline mode
Non-pipeline mode
3.5
ns
DLLIN
T1
T2
T3
T4
DLLIN
T1
T2
T3
T4
for 1:2.5
for 1:3.5
DLLIN
T1
T2
T3
T4
for 1:2, 1:3, 1:4, 1:5, 1:6
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