HP 226824-001 - ProLiant - ML750 Panduan Pengenalan - Halaman 5

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The AMB is an intelligent chip that manages serial communication with the memory controller and

parallel communication with local DRAM devices (Figure 4). Each AMB receives signals (address,

write data, and command information) through the outbound links and re-transmits the signal to the

next FB-DIMM on the channel. Each AMB decodes the command data and ignores the commands that

are targeted for a different DIMM. The targeted AMB performs a read or write operation to local

DRAM devices through a parallel interface. In the case of a read operation, the AMB serializes data

from the DRAM devices and transmits it to the memory controller through the inbound links.

Inbound and outbound serial information is transmitted in packets, or frames. Each inbound frame is

18 bytes long (16 bytes of read data plus 2 bytes of ECC). The FB-DIMM channel clock operates at 6

times the speed of the DRAM clock so that one inbound frame to be transmitted in a single DRAM

clock cycle. The 6:1 clock ratio allows the data rate of the DRAM module to match the data rate of

the inbound link. For example, when using DDR2 533 DRAM on the FB-DIMM, the peak theoretical

throughput of both the DRAM devices and the inbound links is 4.3 GB/sec.

Each outbound frame is 120 bits (15 bytes) long and consists of a command and 9 bytes of write

data (8 bytes plus 1 byte of ECC). Note that the outbound links transport half the amount of data as

the inbound links per DRAM clock cycle (9 bytes compared to 18 bytes).

Figure 4. Advanced Memory Buffer block diagram (all AMB components not shown)