MPC8544COMEDEV Freescale Semiconductor, MPC8544COMEDEV Datasheet - Page 661

• Manufacturer Part Number: MPC8544COMEDEV
• Description: KIT DEV EXPRESS MPC8544COM
• Manufacturer: Freescale Semiconductor
• Type: MPUr

Specifications of MPC8544COMEDEV

• Contents: Board
• For Use With/related Products: MPC8544
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

When this attribute is asserted, the strobe is negated one quarter of a clock before the normal case. For
example, when ACS = 00 and CSNT = 1, LWEn is negated one quarter of a clock earlier, as shown in
Figure
14.4.2.2.3
ORx[TRLX] is provided for memory systems that require more relaxed timing between signals. Setting
TRLX = 1 has the following effect on timing:
Figure 14-26
Figure 14-27
consecutively.
Freescale Semiconductor
•
•
•
•
•
Figure 14-26. GPCM Relaxed Timing Read (XACS = 0, ACS = 1x, SCY = 1, EHTR = 0, TRLX = 1)
14-25.
An additional bus cycle is added between the address and control signals (but only if ACS ≠ 00).
The number of wait states specified by SCY is doubled, providing up to 30 wait states.
The extended hold time on read accesses (EHTR) is extended further.
LCSn signals are negated 1 cycle earlier during writes (but only if ACS ≠ 00).
LWE[0:3] signals are negated 1 cycle earlier during writes.
LBCTL
LCLK
LALE
LCS n
LAD
LOE
and
also shows address and data multiplexing on LAD[0:31] for a pair of writes issued
MPC8544E PowerQUICC III Integrated Host Processor Family Reference Manual, Rev. 1
TA
A
Relaxed Timing
Figure 14-27
Address
ACS = 10
show relaxed timing read and write transactions. The example in
Latched Address
SCY = 1, TRLX = 1
ACS = 11
Read Data
Address
Local Bus Controller
14-41