PXR40RM Datasheet, PDF (1300/1434 Pages) Freescale Semiconductor, Inc – PXR40 Microcontroller

External Bus Interface (EBI)
D_CLKOUT
D_ADD[9:30]
D_ADD[29:31] = ‘000’
D_ADD[28:31] = ‘0000’
D_RD_WR
D_TS
D_BDIP
Expects more data
Expects more data
D_ADD_DAT[0:31]
D_TA
D_ADD_DAT is valid
D_ADD_DAT is valid
CS[n]
D_OE
Figure 30-29. 32-Byte Read with B-T-B 16-Byte Bursts to 32-bit Port, Zero Wait States
30.4.2.6.4 Small Access Example #4: 64-bit Read to 16-bit Port
Figure 30-30 shows an example of a 64-bit read to a 16-bit port, requiring four 16-bit external transactions.
D_CLKOUT
D_ADD[9:30]
A
A+2
A+4
A+6
D_RD_WR
D_BDIP
D_TS
*D_ADD_DAT[0:15]
D_ADD_DAT is valid
ABCD
EFGH
D_ADD_DAT is valid
IJKL
MNOP
D_TA
CS[n]
D_WE
* ^{Or D_ADD_DAT[16:31], based on D16_31 bit in EBI_MCR.}
Figure 30-30. Single Beat 64-bit Read Cycle, 16-bit Port Size, Basic Timing
30-38
PXR40 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor