External Bus Interface (EBI)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
12-44
Freescale Semiconductor
12.4.2.6.2
Small Access Example #2: 32-byte Write with External TA
shows an example of a 32-byte write to a non-chip select device, such as an external master,
using external TA, requiring eight 32-bit external transactions. Due to the use of external TA, 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 TA and the next TS to get the next 64-bits of write data internally and
RD_WR negates during this extra cycle.
Figure 12-28. 32-Byte Write Cycle with External TA, Basic Timing
DATA is valid
DATA is valid
CLKOUT
ADDR[8:31]
TS
DATA[0:31]
TA
RD_
WR
BDIP
WE
CS[
n
]
A
A+4
A+8
A+0xc
DATA is valid
This extra cycle is required after accesses 2, 4, and 6 to get the next 64-bits of internal write data.
*
Four more external accesses (not shown) are required to complete the internal 32-byte request.
The timing of these is the same as accesses 1-4 shown in this diagram.
**
1
2
3
4**
*
Содержание MPC5565
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