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MPC8280 Scheda tecnica(PDF) 475 Page - Freescale Semiconductor, Inc

Il numero della parte MPC8280
Spiegazioni elettronici  PowerQUICC??II Family Reference Manual
PDF  1386 Pages
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Produttore elettronici  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MPC8280 Scheda tecnica(HTML) 475 Page - Freescale Semiconductor, Inc

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Memory Controller
MPC8280 PowerQUICC II Family Reference Manual, Rev. 1
Freescale Semiconductor
11-55
Figure 11-42. GPCM Peripheral Device Basic Timing (ACS = 1x and TRLX = 0)
11.5.1.2
Chip-Select and Write Enable Deassertion Timing
Figure 11-43 shows a basic connection between the MPC8280 and a static memory device. Here, CS is
connected directly to CE of the memory device. The WE signals are connected to the respective W signal
in the memory device where each WE corresponds to a different data byte.
Figure 11-43. GPCM Memory Device Interface
As Figure 11-45 shows, the timing for CS is the same as for the address lines. The strobes for the
transaction are supplied by OE or WE, depending on the transaction direction (read or write). ORx[CSNT]
controls the timing for the appropriate strobe negation in write cycles. 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, WE is negated one quarter of a clock earlier, as shown in Figure 11-44.
Clock
Address
PSDVAL
CS
R/W(BCTL0)
Data
ACS = 11
ACS = 10
Address
CE
OE
W
Data
MEMORY
Data
WE
OE
CS
Address
MPC8280



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