M58BF008 datasheet(13/36 Pages) STMICROELECTRONICS

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M58BF008

Wrap/No-wrap Burst Toggle (WBT). The

de-

fault for burst read is set by the device configura-

tion. The Wrap/No-wrap Burst Toggle can be used

to toggle the burst wrap operation.

The Wrap/No-wrap Burst Toggle instruction con-

sists of one write cycle giving the command 30h at

the address 00000h. Two consecutive instructions

are not recognised and another Instruction, for ex-

ample the Read Memory Array, must be given be-

fore another Wrap/No-wrap Burst Toggle will be

recognised.

Overlay Block Read Enable/Disable Toggle

(OBT). Read operations in the Overlay block can

be enabled or disabled using the Overlay Block

Read Enable/Disable Toggle instruction. This tog-

gle instruction consists of one write cycle giving

the command 06h at the address 00000h. Two

consecutive instructions are not recognised.

The Status Register bit 1 is set to ’1’ when the

Overlay block is enabled.

Table 9. Read Access to Overlay Block or Main Block

Table 10. Overlay Block Enable/Disable Bit (OBEB)

Note: 1. Toggle H-L-H for tPLPH minimum.

OBEB Status Bit

VPP

OBS Status Bit

Read Access

In the range VPP1 or VPPH

Overlay Block

Out of the range

VPP1 or VPPH

Main Block

Unknown

Not guaranteed

Unknown

OBEB Status Bit

Method

VPP

Prior state of

OBEB

Next state of

OBEB

Toggle RP (1)

In the range

VPP1 or VPPH

Out of the range

VPP1 or VPPH

Power-on-reset

In the range

VPP1 or VPPH

Out of the range

VPP1 or VPPH

Overlay Block Read Enable/Disable instruction OBT

–0

–1

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