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Intel® 6400/6402 Advanced Memory Buffer Datasheet

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Signal Lists

13.1

Conventions

The terms assertion and de-assertion are used extensively when describing signals, to

avoid confusion when working with a mix of active-high and active-low signals. The

term assert, or assertion, indicates that the signal is active, independent of whether the

active level is represented by a high or low voltage. The term de-assert, or de-

assertion, indicates that the signal is inactive.

Signal names may or may not have a “#” at appended to them. The “#” symbol at the

end of a signal name indicates that the active, or asserted state occurs when the signal

is at a low voltage level. When “#” is not present after the signal name the signal is

asserted when at the high voltage level.

Differential pairs use the “#” to indicate the “negative” signal in the pair. The “positive”

signal in When discussing data values used inside the component, the logical value is

used; that is, a data value described as “1101b” would appear as “1101b” on an active-

high bus, and as “0010b” on an active-low bus. When discussing the assertion of a

value on the actual signal, the physical value is used; that is, asserting an active-low

signal produces a “0” value on the signal.

Typical frequencies of operation for the fastest operating modes are indicated. Test

guardbands are not included. No frequency is mentioned for asynchronous or analog

signals.

Some signals or groups of signals have multiple versions. These signal groups may

represent distinct but similar ports or interfaces, or may represent identical copies of

the signal used to reduce loading effects. Table 13-1 shows the conventions used in this

document

Curly-bracketed non-trailing numerical indices, for example, “{X/Y}”, represent

replications of major buses. Square-bracketed numerical indices, , “[n:m]” represent

functionally similar but logically distinct bus signals; each signal provides an

independent control, and may or may not be asserted at the same time as the other

signals in the grouping. In contrast, trailing curly-bracketed numerical indices, for

example, “{x/y}” typically represent identical duplicates of a signal; such duplicates

are provided for electrical reasons.

Table 13-2 lists the reference terminology used for signal types.

Table 13-1. Signal Naming Conventions

Convention

Expands to

RR{0/1/2}XX

Expands to: RR0XX, RR1XX, and RR2XX. This denotes

similar signals on replicated buses.

RR[2:0]

Expands to: RR[2], RR[1], and RR[0]. This denotes a

bus.

RR{0/1/2}

Expands to: RR2, RR1, and RR0. This denotes electrical

duplicates.

RR# or RR[2:0]# Denotes an active low signal or bus.

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