PC48F4400PLVB0 datasheet(57/102 Pages) NUMONYX

57 / 102 page

November 2007

Datasheet

Order Number: 290701-18

Numonyx™ Wireless Flash Memory (W18)

10.5

CFI Query

This device contains a separate CFI query database that acts as an “on-chip datasheet.”

The CFI information within this device can be accessed by issuing the Read Query

command and supplying a specific address. The address is constructed from the base

address of a partition plus a particular offset corresponding to the desired CFI field.

Appendix B, “Common Flash Interface (CFI)” on page 89 shows accessible CFI fields

and their address offsets.

Issuing the Read Query command to a partition that is programming or erasing puts

that partition in read query mode while the partition continues to program or erase in

the background.

10.6

Read Status Register

The device’s Status Register displays program and erase operation status. A partition’s

status can be read after writing the Read Status Register command to any location

within the partition’s address range. Read-status mode is the default read mode

following a Program, Erase, or Lock Block command sequence. Subsequent single reads

from that partition will return its status until another valid command is written.

The read-status mode supports single synchronous and single asynchronous reads

only; it doesn’t support burst reads. The first falling edge of OE# or CE# latches and

updates Status Register data. The operation doesn’t affect other partitions’ modes.

Because the Status Register is 8 bits wide, only DQ [7:0] contains valid Status Register

data; DQ [15:8] contains zeros. See Table 25, “Status Register Definitions” on page 57

and Table 26, “Status Register Descriptions” on page 58.

Each 4-Mbit partition contains its own Status Register. Bits SR[6:0] are unique to each

partition, but SR[7], the Device WSM Status (DWS) bit, pertains to the entire device.

SR[7] provides program and erase status of the entire device. By contrast, the Partition

WSM Status (PWS) bit, SR[0], provides program and erase status of the addressed

partition only. Status register bits SR[6:1] present information about partition-specific

program, erase, suspend, VPP, and block-lock states. Table 27, “Status Register Device

WSM and Partition Write Status Description” on page 58 presents descriptions of DWS

(SR[7]) and PWS (SR[0]) combinations.

Protection Register Lock Status

Partition

80h

Lock Data

Protection Register

Partition

81h - 88h

Multiple reads required to read the

entire 128-bit Protection Register.

Notes:

The address is constructed from a base address plus an offset. For example, to read the Block Lock Status for block

number 38 in a BPD, set the address to the BBA (0F8000h) plus the offset (02h), i.e. 0F8002h. Then examine bit 0 of

the data to determine if the block is locked.

See

Section 13.1.4, “Block Lock Status” on page 73 for valid lock status.

Table 24: Device Identification Codes (Sheet 2 of 2)

Item

Address1

Data

Description

Base

Offset

Table 25: Status Register Definitions

DWS

ESS

VPPS

PSS

DPS

PWS

543

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