MSC8101ADS Freescale Semiconductor / Motorola, MSC8101ADS Datasheet - Page 53

• Manufacturer Part Number: MSC8101ADS
• Description: MSC8101 APP DEV SYSTEM
• Manufacturer: Freescale Semiconductor / Motorola

2.6.5
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
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
Freescale Semiconductor
No.
11a
11b
11d
11e
11c
11f
10
1:2, 1:3, 1:4, 1:5, 1:6
controller programming; the AC specifications are relative to the internal tick. SDRAM machine outputs
change only on the
PLL Clock Ratio
Hold time for all signals after the 50% level of the DLLIN rising edge
ABB/AACK set-up time before the 50% level of the DLLIN rising edge
DBG/DBB/BR/TC set-up time before the 50% level of the DLLIN rising edge
ARTRY set-up time before the 50% level of the DLLIN rising edge
TA set-up time before the 50% level of the DLLIN rising edge
•
•
TEA set-up time before the 50% level of the DLLIN rising edge
•
•
PSDVAL set-up time before the 50% level of the DLLIN rising edge
•
•
System Bus Access Timing
Pipeline mode
Non-pipeline mode
Pipeline mode
Non-pipeline mode
Pipeline mode
Non-pipeline mode
1:2.5
1:3.5
DLLIN
DLLIN
DLLIN
DLLIN
Figure 2-9.
T1
T1
T1
. Memory controller signals, however, trigger on four points within a DLLIN cycle.
DLLIN
Table 2-15.
rising edge.
T2
Table 2-16.
T2
Internal Tick Spacing for Memory Controller Signals
T2
3/10 DLLIN
4/14 DLLIN
MSC8101 Technical Data, Rev. 19
1/4 DLLIN
Tick Spacing for Memory Controller Signals
T2
Characteristic
T3
T3
T3
Tick Spacing (T1 Occurs at the Rising Edge of DLLIN)
AC Timing for SIU Inputs
T4
T4
T4
1/2 DLLIN
1/2 DLLIN
1/2 DLLIN
T3
for 1:2, 1:3, 1:4, 1:5, 1:6
for 1:2.5
for 1:3.5
11/14 DLLIN
8/10 DLLIN
Value
3/4 DLLIN
0.5
3.5
5.0
4.0
3.5
4.0
4.0
3.0
3.5
3.5
T4
2
AC Timings
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
2-13