MSM5718B70 Ver la hoja de datos (PDF) - Oki Electric Industry

Número de pieza

componentes Descripción

Fabricante

MSM5718B70

18-Megabit RDRAM (2M x 9)

Oki Electric Industry 

¡ Semiconductor

MSM5718B70

PROTOCOL

The transaction protocol used in Rambus systems is built from several types of information packets.

These include the request, acknowledge, serial mode, and data packets.

Request Packet

A master device initiates a transaction by generating a six-byte request packet containing address,

control, and byte count information as shown in Fig. 6. The Op and OpX fields in the Request packet

contain a command that is used to instruct the RDRAM which operation is being requested. A

summary of these commands is shown in Table 3.

Bus- Bus-

Enable Ctrl

[0] —

even

Start Op[0]

[0]

odd

—

Op[1] Op[3]

[1]

even

—

OpX[1]

[1]

odd

—

Op[2]

[2]

even

—

OpX[0] ReqUnimp[5:4]

[2] —

odd

ReqUnimp[8:6]

Time

BusData (8:0)

Adr[9:2]

Adr[17:10]

Adr[26:18]

Adr[35:27]

Count[6, 4, 2]

ReqUnimp[3:0]

Count[7, 5, 3]

Count[1:0] Adr[1:0]

Fig. 6 Request Packet 1

Note: 1. A — in this diagram signifies that this pin is not used by this packet. If it is not used

by another packet, it is pulled to a logic zero value.

7

Share Link: