External Bus Interface (EBI)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
Freescale Semiconductor
12-45
12.4.2.6.3
Small Access Example #3: 32-byte Read to 32-bit Port with BL = 1
shows an example of a 32-byte read to a 32-bit burst enabled port with burst length of 4
words, requiring two 16-byte external transactions. For this case, the address for the second 4-word burst
access is calculated by adding 0x10 to the lower 5 bits of the first address (no carry), and then masking out
the lower 4 bits to fix them at zero.
Figure 12-29. 32-Byte Read with Back-to-Back 16-Byte Bursts to 32-bit Port, Zero Wait States
Table 12-16. Examples of 4-word Burst Addresses
1st Address
Lower 5 bits of 1st A
0x10 (no carry)
Final 2nd Address
(After Masking Lower 4 Bits)
0x000
0x10
0x10
0x008
0x18
0x10
0x010
0x00
0x00
0x018
0x08
0x00
0x020
0x30
0x30
0x028
0x38
0x30
0x030
0x20
0x20
0x038
0x28
0x20
Expects more data
CLKOUT
ADDR[8:31]
BDIP
DATA[0:31]
TA
RD_WR
TS
OE
CS[
n
]
ADDR[29:31] = ‘000’
DATA is valid
ADDR[28:31] = ‘0000’
DATA is valid
Содержание MPC5565
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