7782 datasheet(13/63 Pages) STMICROELECTRONICS

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M58CR032C, M58CR032D

Protection Register, see Figure 6, for an example

of a single synchronous read operation.

Synchronous Burst Read. The device also sup-

ports a synchronous burst read. In this mode a

burst sequence is started at the first clock edge

(rising or falling according to configuration set-

tings) after the falling edge of Latch Enable. After

a configurable delay of 2 to 5 clock cycles a new

data is output at each clock cycle. The burst se-

quence may be configured to be sequential or in-

terleaved and for a length of 4 or 8 words or for

continuous burst mode (see Table 5, Burst Type

Definition). Wrap and no-wrap modes are also

supported.

A WAIT signal may be asserted to indicate to the

system that an output delay will occur. This delay

will depend on the starting address of the burst se-

quence; the worst case delay will occur when the

sequence is crossing a 64 word boundary and the

starting address was at the end of a four word

boundary. See the Burst Configuration Register

command for more details on all the possible set-

tings for the synchronous burst read (see Table 4).

It is possible to perform burst read across bank

boundaries (all banks in read array mode).

Table 3. Bus Operations

Note: 1. X = Don’t care.

2. T = transition, falling edge for L, rising or falling edge for K depending on M6 in the Burst Configuration Register. The burst sequence

is started on the first active clock edge after the falling edge of Latch Enable.

3. L can be tied to VIH if the valid address has been previously latched

Operation

KRP

DQ15-DQ0

Asynchronous Read

VIL

VIH

VIL

(3)

VIH

Data Output

Asynchronous Page Read

VIL

VIH

VIL

(3)

VIH

Data Output

Asynchronous Write

VIL

VIH

VIL

(3)

VIH

Data Input

Output Disable

VIL

VIH

Hi-Z

Standby

VIH

Hi-Z

Reset / Power-Down

VIL

Hi-Z

Synchronous Read

VIL

VIH

T(2)

VIH

Data Output

Synchronous Burst Read

VIL

VIH

T(2)

VIH

Data Output

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