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SRAM
MPC5566 Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
14-3
3. The ECC is then calculated on the resulting 64 bits formed in the previous step.
4. The 8-bit ECC result is appended to the 64 bits from the data bus, and the 72-bit value is then
written to SRAM.
14.6.1
Access Timing
The system bus is a two-stage pipelined bus, which makes the timing of any access dependent on the access
during the previous clock.
lists the various combinations of read and write operations to SRAM
and the number of wait states used for the each operation. The table columns contain the following
information:
Current operation
Lists the type of SRAM operation executing currently
Previous operation Lists the valid types of SRAM operations that can precede the current SRAM
operation (valid operation during the preceding clock)
Wait states
Lists the number of wait states (bus clocks) the operation requires which depends
on the combination of the current and previous operation
Table 14-3. Number of Wait States Required for SRAM Operations
Current Operation
Previous Operation
Number of Wait States Required
Read Operation
Read
Idle
1
Pipelined read
Burst read
64-bit write
2
8-, 16-, or 32-bit write
0
(read from the same address)
1
(read from a different address)
Pipelined read
Read
0
Burst read
Idle
1,0,0,0
Pipelined read
Burst read
64-bit write
2,0,0,0
8-, 16-, or 32-bit write
0,0,0,0
(read from the same address)
1,0,0,0
(read from a different address)
Summary of Contents for MPC5566
Page 81: ...Introduction MPC5566 Microcontroller Reference Manual Rev 2 1 24 Freescale Semiconductor...
Page 135: ...Signal Description MPC5566 Microcontroller Reference Manual Rev 2 2 54 Freescale Semiconductor...
Page 189: ...Reset MPC5566 Microcontroller Reference Manual Rev 2 4 20 Freescale Semiconductor...
Page 603: ...Flash Memory MPC5566 Microcontroller Reference Manual Rev 2 13 38 Freescale Semiconductor...
Page 609: ...SRAM MPC5566 Microcontroller Reference Manual Rev 2 14 6 Freescale Semiconductor...
Page 1073: ...MPC5566 Microcontroller Reference Manual Rev 2 22 36 Freescale Semiconductor...
Page 1185: ...Nexus MPC5566 Microcontroller Reference Manual Rev 2 25 92 Freescale Semiconductor...