PXR40RM Datasheet, PDF (1298/1434 Pages) Freescale Semiconductor, Inc – PXR40 Microcontroller

External Bus Interface (EBI)
D_CLKOUT
D_ADD[9:30]
A
A+2
D_RD_WR
D_BDIP
D_TS
D_ADD_DAT[0:31]
D_ADD_DAT is valid
ABCDXXXX
D_ADD_DAT is valid
EFGHXXXX
D_TA
CS[n]
D_WE
Figure 30-27. Single Beat 32-bit Write Cycle, 16-bit Port Size, Basic Timing
30.4.2.6.2 Small Access Example #2: 32-byte Write with External D_TA
Figure 30-28 shows an example of a 32-byte write to a non-chip-select device using external D_TA,
requiring eight 32-bit external transactions. Note that due to the use of external D_TA, D_RD_WR does
not toggle between the accesses unless that access is the end of a 64-bit boundary. In this case, an extra
cycle is required between D_TA and the next D_TS in order to get the next 64-bits of write data internally
and D_RD_WR negates during this extra cycle.
30-36
PXR40 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor