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Cavium Processor Complex: Memory

10009109-01 ATCA-9305 User’s Manual

3-9

MEMORY

The processor complex supports DDR2 Synchronous DRAM (SDRAM) and Reduced Latency

DRAM (RLDRAM) memory devices.

DDR2 SDRAM

The ATCA-9305 supports up to 16 gigabytes of 144-bit wide DDR2 SDRAM per processor

complex. The SDRAM interface clock speed frequency is 400 MHz. The four low-profile,

dual-inline memory modules (buffered DIMM) are installed in 240-pin very low profile (VLP)

sockets to reduce board density and routing constraints. A 2 KB EEPROM on the DIMM pro-

vides the serial presence detection (SPD). On-card SDRAM occupies physical addresses

from 0,0000,0000,0000

to 0,0003,FFFF,FFFF

Each processor memory bus is operating in 144-bit mode. Error-correcting Code (ECC) is

performed on the memory bus so that the CN5860 detects all double-bit errors, multi-bit

errors within a nibble, and corrects all single-bit errors.

RLDRAM

Each CN5860 supports 256 MB Common I/O (CIO) RLDRAM operating up to 400 MHz

(depends on the processor speed). The Micron RLDRAM II is organized as 32Mx18x8 internal

banks. The DDR I/O interface transfers two data words per clock cycle. Output data is refer-

enced to the free-running output data clock. Read and write accesses to the RLDRAM are

burst-oriented. RLDRAM is accessed by using Cavium-specific instructions which operate on

MIPS Coprocessor 2.

C EEPROM

Each Cavium processor complex has one user EEPROM device for parameter storage located

on the I

C bus, address 0xA8. The I

C bus for each processor is completely independent

from the other CN5860 processor and MPC8548 processor I

C buses. The Atmel two-wire

serial EEPROM on each CN5860 processor I

C interface consists of the Serial Clock (SCL)

input and the Serial Data (SDA) bidirectional lines.

stdin serial Sets the standard source for console input

Valid options: serial, pci

stdout serial Sets the standard destination for console output

Valid options: serial, pci

Variable:

Default

Value: Description: (continued)

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 183 184

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