JS28F128P33TF70A datasheet(32/88 Pages) MICROCHIP

32 / 88 page

P33-65nm

Datasheet

Jul 2011

Order Number: 208034-04

11.0

Status Register

To read the Status Register, issue the Read Status Register command at any address.

Status Register information is available to which the Read Status Register, Word

Program, or Block Erase command was issued. SRD is automatically made available

following a Word Program, Block Erase, or Block Lock command sequence. Reads from

the device after any of these command sequences outputs the device’s status until

another valid command is written (e.g. the Read Array command).

The Status Register is read using single asynchronous-mode or synchronous burst

mode reads. SRD is output on DQ[7:0], while 0x00 is output on DQ[15:8]. In

asynchronous mode the falling edge of OE#, or CE# (whichever occurs first) updates

and latches the Status Register contents. However, when reading the Status Register in

synchronous burst mode, CE# or ADV# must be toggled to update SRD.

The Device Ready Status bit (SR.7) provides overall status of the device. SR[6:1]

present status and error information about the program, erase, suspend, VPP, and

block-locked operations.

Table 11: Status Register Description

Status Register (SR)

Default Value = 0x80

Device Ready

Status

Erase

Suspend

Status 1

1. Always clear the Status Register before resuming erase operations afer an Erase Suspend command; this prevents ambiguity in

Status Register information. For example, if a command sequence error occurs during an erase suspend state, the Status

Register contains the command sequence error status (SR[7,5,4] set). When the erase operation resumes and finishes, possible

errors during the erase operation cannot be deteted via the Stauts Register because it contains the previous error status.

Erase/Blank

Check Status

Program

Status

VPP Status

Program

Suspend

Status

Block-Locked

Status

BEFP Write

Status

DRS

ESS

VPPS

PSS

BLS

BWS

765

43210

Bit

Name

Description

Device Ready Status

0 = Device is busy; program or erase cycle in progress; SR.0 valid.

1 = Device is ready; SR[6:1] are valid.

Erase Suspend Status

0 = Erase suspend not in effect.

1 = Erase suspend in effect.

Erase/Blank

Check Status

Command

Sequence

Error

SR.5

SR.4

Description

Program

Status

Program or Erase operation successful.

Program error -operation aborted.

Erase or Blank Check error - operation aborted.

Command sequence error - command aborted.

VPP Status

0 = VPP within acceptable limits during program or erase operation.

1 = VPP < VPPLK during program or erase operation.

Program Suspend Status

0 = Program suspend not in effect.

1 = Program suspend in effect.

1Block-Locked Status

0 = Block not locked during program or erase.

1 = Block locked during program or erase; operation aborted.

0BEFP Write Status 2

2. BEFP mode is only valid in array.

After Buffered Enhanced Factory Programming (BEFP) data is loaded into the

buffer:

0 = BEFP complete.

1 = BEFP in-progress.

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