CHAPTER 3
System Memory Controller (SMC)
Introduction................................................................................................................3-1
Overview.............................................................................................................3-1
Features...............................................................................................................3-1
Block Diagrams .........................................................................................................3-2
Functional Description...............................................................................................3-6
SDRAM Accesses...............................................................................................3-6
Address Pipelining.......................................................................................3-6
Page Holding ...............................................................................................3-7
SDRAM Speeds...........................................................................................3-7
SDRAM Organization ........................................................................................3-9
PPC60x Bus Interface.........................................................................................3-9
PPC60x Data Parity ...................................................................................3-10
Cache Coherency .......................................................................................3-11
L2 Cache Support ......................................................................................3-11
SDRAM ECC ...................................................................................................3-11
Cycle Types ...............................................................................................3-11
Error Reporting..........................................................................................3-12
Error Logging ............................................................................................3-13
ROM/Flash Interface ........................................................................................3-14
ROM/Flash Speeds ....................................................................................3-19
I2C Interface .....................................................................................................3-22
I2C Byte Write...........................................................................................3-23
I2C Random Read .....................................................................................3-25
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