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PF38F5070MJP0B 数据表(PDF) 57 Page - Numonyx B.V |
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PF38F5070MJP0B 数据表(HTML) 57 Page - Numonyx B.V |
57 / 102 page November 2007 Datasheet Order Number: 290701-18 57 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 Register Data Multiple reads required to read the entire 128-bit Protection Register. Notes: 1. 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. 2. 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 ES PS VPPS PSS DPS PWS 76 543 21 0 |
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