M58LW032 datasheet(15/61 Pages) STMICROELECTRONICS

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M58LW032A

Synchronous Bus Operations

For synchronous bus operations refer to Table 3

together with the text below.

Synchronous Burst Read. Synchronous

Burst

Read operations are used to read from the memo-

ry at specific times synchronized to an external ref-

erence clock. The burst type, length and latency

can be configured. The different configurations for

Synchronous Burst Read operations are de-

scribed in the Burst Configuration Register sec-

tion.

A valid Synchronous Burst Read operation begins

when the address is set on the Address Inputs,

Write Enable is High, VIH, and Chip Enable and

Latch Enable are Low, VIL, during the active edge

of the Clock. The address is latched on the first ac-

tive clock edge when Latch Enable is low, or on

the rising edge of Latch Enable, whichever occurs

first. The data becomes available for output after

the X-latency specified in the Burst Control Regis-

ter has expired. The output buffers are activated

by setting Output Enable Low, VIL. See Figures 6

and 7 for examples of Synchronous Burst Read

operations.

In Continuous Burst mode one Burst Read opera-

tion can access the entire memory sequentially. If

the starting address is not associated with a page

(4 Word) boundary the Valid Data Ready, R, out-

put goes Low, VIL, to indicate that the data will not

be ready in time and additional wait-states are re-

quired. The Valid Data Ready output timing (bit

M8) can be changed in the Burst Configuration

The Synchronous Burst Read timing diagrams

and AC Characteristics are described in the AC

and DC Parameters section. See Figures 18, 19

and Table 20.

Table 3. Synchronous Burst Read Bus Operations

Note: 1. X = Don't Care, VIL or VIH.

2. M15 = 0, Bit M15 is in the Burst Configuration Register.

3. T = transition, see M6 in the Burst Configuration Register for details on the active edge of K.

Bus Operation

Step

K(3)

A1-A21

DQ0-DQ15

Synchronous Burst Read

Address Latch

VIL

VIH

VIL

Address Input

Read

VIL

VIH

Data Output

Read Abort

VIH

High Z

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