External Bus Interface (EBI)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
12-54
Freescale Semiconductor
shows the possible 3-bit codes that are associated with various slaves in the MCU, as well as
the resulting upper 12 address bits required to appropriately match up with the memory map of each
internal slave.
12.4.2.10.2
Bus Transfers Initiated by an External Master
The external master gets ownership of the bus (refer to
Section 12.4.2.8, “Arbitration
”) and asserts TS to
initiate an external master access. The access is directed to the internal bus only if the input address
matches to the internal address space. The access is terminated with either TA or TEA. If the access was
successfully completed, the MCU asserts TA, and the external master can proceed with another external
master access, or relinquish the bus. If an address or data error was detected internally, the MCU asserts
TEA for one clock.
Table 12-21. EBI Internal Slave Address Decoding
Internal Slave
External ADDR[8:11]
1
1
Value on upper 4 bits of 24-bit external address bus ADDR[8:31]. ADDR[8] determines whether
the access is on or off chip.
Internal ADDR[0:7]
2
2
Value on upper 8 bits of 32-bit internal address bus.
Internal ADDR[8:11]
3
3
Value on bits 8:11 of 32-bit internal address bus.
(off-chip)
0b0xxx
—
—
Internal flash
0b10xx
0b0000_0000
0b00, ADDR[10:11]
Internal SRAM
0b1100
0b0100_0000
0b0000
Reserved
0b1101
0b0110_0000
0b0000
Bridge A
peripherals
0b1110
0b1100_0011
0b1111
Bridge B
peripherals
0b1111
0b1111_1111
0b1111
Содержание MPC5565
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